Best Krill Oil Supplements

Our bodies don’t make every single nutrient we need to survive. Some things, like omega-3 fatty acids, must be supplemented by our diets. But when food deserts, rising prices, or a simple distaste for fish mean that 68% of adults and 95% of children in the United States don’t get enough omega-3 fatty acids, it’s critical to find outside sources.1

Krill oil is an unsung hero among omega-3 supplements. It has all of the benefits of fish oil with a few added nutritional bonuses. We dove into the world of krill oil supplements and came up with our top five picks, along with three honorable mentions.

In this guide, we’ll discuss what makes krill oil so good and how you can find the best supplement for you before diving deep into each of our top products.

Don’t have time to read the whole article right now? We’ve made a list of our top picks below.

Over the past two decades, Innerbody Research has helped tens of millions of readers make more informed decisions about staying healthy and living healthier lifestyles.

We extensively research and test each health service or product we review to deliver unbiased, thorough reviews of at-home health options. We evaluate products and services based on their adherence to quality, the latest medical evidence, and current health standards. For this guide to the best krill oil, we pored over 50 scientific studies and personally tried many of the supplements ourselves to bring you the most important details — from benefits and dosages to aftertaste and ease of swallowing.

Additionally, like all health-related content on this website, this guide was thoroughly vetted by one or more members of our Medical Review Board for accuracy.

We evaluated krill oil supplements across the market based on how they stacked up in three different categories, considering a collection of key questions:

• Effectiveness: Does the supplement meet (or safely exceed) the doses of ingredients recommended by researchers, backed up by adequate scientific evidence?
• Cost: How much is the supplement? Do the doses of ingredients and the cost per serving justify the price of the bottle?
• Transparency: Is the supplement safe for you to take? Is it third-party tested? What steps are being taken by the company to minimize its impact on the ocean’s ecosystem?

Effectiveness

Winner: NatureMyst

For a krill oil supplement to be effective, the krill oil should be the main focus, and any added ingredients should work in service to boost your omega-3 levels. When we look at the effectiveness of different krill oils, we investigate their ingredients and doses, how they’re made (including GMP and other manufacturing certifications), and the companies’ testing processes.

NatureMyst, our pick for best overall, offers the highest amount of omega-3 fatty acids out of any other pure krill oil supplement we tried (Purity Products’ krill and fish oil blend has the most omega-3s overall at 620mg).

This supplement’s 1,000mg of krill oil consists of 340mg of omega-3s (230mg EPA and 110mg DHA), 450mg of phospholipids, and 1.5mg of astaxanthin. Additionally, NatureMyst’s krill oil is certified sustainable by Friend of the Sea, produced in a GMP-certified (good manufacturing practice) facility, and third-party tested for “purity, potency, and quality.”

A close runner-up is 1MD Nutrition’s KrillMD, which offers a bit more phospholipids (550mg) and astaxanthin (2mg), but fewer total omega-3s (320mg) than NatureMyst. However, KrillMD costs nearly two-and-a-half times more than NatureMyst’s krill oil — $49.99 compared to $19.99. For providing the same number of servings (30) and not having a huge difference in the doses provided, the price gap is a bit difficult to understand.

Cost

Winner: Kirkland Signature

The sticker price of a supplement is only the first thing we consider while determining which has the best cost. The supplement’s value (how much you pay per serving), the actual nutritional benefit, and the quality of that supplement all play a role in an item’s cost. Likewise, any other savings programs, rewards, subscription services, or deals a company offers factor into our rating.

Kirkland Signature, Costco’s home brand, continues in the company’s cost-saving footsteps. Its krill oil softgel containers hold 160 servings at a mere $24.99 (about $0.16 per serving), providing more than five months’ worth of krill oil for the same price as one month of competitors’ formulas. And while each dose is half the size of those competitors at 500mg, you can take two a day and still get more servings per bottle at a much lower price.

Our runner-up in this category is Sports Research, which offers its Omega-3 Antarctic Krill Oil in bottles of 60 and 120 softgels. If you opt for the 120-count at $31.95, this will last you for 120 days, as the serving size is one softgel.

Transparency

Winner: Kori

When it comes to supplements made directly from animals, there should be complete transparency about their creation. Safety features, such as whether or not the supplements are third-party tested, are critical to know. Likewise, knowing where and how the krill were harvested can give us peace of mind for the environment and our health. Krill oil might be a more sustainable option than fish oil, but its harvest can still have major impacts on the health and wellbeing of some other living beings, like penguins.2 3 So, to be our top pick in transparency, krill oil supplement manufacturers should have safety and sustainability information easily accessible to anyone who wants to find it.

You can find anything you want to know about Kori’s practices directly on its website. One of the first pages on that website is about the brand’s sustainability efforts. Not only is the company certified sustainable with multiple outside partnerships, but it earned an A rating from the Sustainable Fisheries Partnership for fish oil, meaning the company leaves virtually no trace on the land and ecosystem from which it harvests its krill. (Kori uses Superba 2 krill from one of the most sustainable fisheries in the world.)

Kori uses what is essentially an underwater vacuum to catch its krill and nothing else, explaining the technology clearly on its sustainability page. And if you scan the QR code on your box, Kori will show you exactly where the krill oil you’re taking came from and when. Plus, you can view the third-party testing certificate of analysis for the latest batch directly from the brand’s homepage whenever you want.

The runner-up for transparency is the Omega-3 Antarctic Krill from Sports Research, which also contains Superba 2 krill and is third-party tested.

The chart below compares our top five picks for best krill oil supplements, from costs and customer support policies to total omega-3s, servings, and more. Keep in mind that the costs are based on one-time purchases of a single unit — they don't take into account any potential savings from bulk purchases or subscriptions, which can be substantial for some products.

Before diving into the details of krill oil, it’s important to understand what fatty acids and omega-3s are and what they do for your health and day-to-day wellbeing. Omega-3s, specifically, are why people tend to supplement with fish or krill oil. The modern Western diet consists mainly of omega-6s and fewer omega-3s, which isn’t the ideal ratio according to experts and researchers.26 27

There are four major kinds of fatty acids:15 16

• Saturated fats (fats you should generally try to limit, found in animal products)
• Monounsaturated fats (“good” fats found in olive oil, nuts, and seeds)
• Polyunsaturated fats (“good” fats found in fish, such as omega-3 and omega-6)
• Trans fats (“bad” fats found in fried and processed foods)

Oil from sea creatures — including fish and krill — provides a significant amount of fatty acids to your body. One of the many ways that fatty acids help cells function is by combining with glycerol to make up phospholipids,6 which create and restore cell membranes, among dozens of other important functions.7 A close relative of the phospholipid is triglyceride, which is also composed of fatty acids and glycerol. Triglycerides store excess calories that your body doesn’t immediately need from food so that it can keep functioning even when you’re not eating.8 The main structural difference between triglycerides and phospholipids is that triglycerides are made up of three fatty acid molecules (hence “tri”) while phospholipids contain two.9

Now, fish oil’s fatty acids come from triglycerides, while krill oil’s comes from phospholipids — fish contains about 1%-1.5% phospholipids, while krill contains 40%.10 Triglycerides aren’t water-soluble (not as easily digested14), and this could be why side effects like fishy burps are common with fish oil but not reported as often with krill oil.11 Phospholipids, on the other hand, are both fat- and water-soluble, making them easier to digest.9 12 13 They also act as an emulsifier to help to break down fats,13 which could be why krill oil’s nutrients are considered to be more bioavailable than fish oil’s.25

Omega-3 fatty acids

There are multiple kinds of omega fatty acids. Most are either monounsaturated fats (like omega-9 fatty acids) or polyunsaturated fats. Omega-3 is a polyunsaturated fat that our body doesn’t naturally produce, so it’s essential to get enough through our diets to keep our bodies functioning.17 Specifically, omega-3 helps to support a healthy body by reducing the risk of:17

• Cardiovascular disease
• Blood clots
• Inflammation
• High triglycerides
• High blood pressure

Omega-3s also help keep our arteries functioning properly, preventing blockages that can cause cardiovascular problems. And their potential anti-inflammatory properties mean they might be able to help ease the symptoms of other diseases and disorders. Arthritis — both rheumatoid and osteoarthritis — is a significant area of focus,18 19 as well as heart problems like coronary heart disease, some neurodegenerative diseases, and even depression.20 21 22

Alga (algae) is a fantastic source of omega-3 fatty acids. So are the sea creatures that eat it. We reap these nutritional benefits when we take fish, krill, or mussel oil. However, you can also get omega-3s from vegetarian sources like flaxseeds, chia seeds, and walnuts. Different kinds of omega-3s can vary between these two sources. There are four common omega-3s, which we’ll discuss below.

Krill is a kind of tiny crustacean similar to shrimp. There are more than 80 kinds of krill worldwide, but all of them can be used to make krill oil. Antarctic krill (Euphausia superba) is the most common kind used to make krill oil since they are one of the most abundant species on the planet.4

After the krill has been harvested, their oil is extracted using acetone and ethanol.5 The resulting oil is put into capsules and sold directly to you. A simple extraction process like this preserves all of the krill’s natural nutrition benefits, including:5

• Fatty acids (especially omega-3s)
• Choline
• Astaxanthin
• Phospholipids

Let’s take a closer look at these compounds and what they can do for your body.

These benefits don’t mean that fish oil has nothing to offer. It’s often less expensive and easier to find in stores. And if you’re allergic to crustaceans, it’s an equally healthy alternative.

Other fish oil alternatives

Krill oil isn’t the only alternative to fish oil. Green-lipped mussel oil is an excellent choice if you want to get your omega-3s from another hearty sea creature. Studies have shown that while green-lipped mussel oil isn’t quite as good at offering EPA and DHA, it significantly improves osteoarthritis pain and inflammation.46 47

Whether vegan or vegetarian, you can also get your omega-3 supplementation from the same source as fish, krill, and mussels — algae. Fish, krill, and mussels don’t make excess omega-3s but gain it by consuming algae (or creatures that eat algae), which is extremely rich in omega-3s. Algal oil is one of the best sources of vegan omega-3s. Some companies also make plain omega-3 supplements, which are almost always derived from algae or fish.

You can also eat more flaxseed and walnuts for extra omega-3s if you aren’t interested in a supplement but need more in your diet. However, walnuts, flaxseed, and other non-algae plant-based sources of omega-3 break down into ALA, not EPA or DHA, so you’ll see different benefits.

As an essential nutrient, there are dozens of things that omega-3s can provide to your body. Contemporary Western diets have replaced many natural sources of omega-3s with omega-6s, which are similar but considerably harder for our bodies to use.26 27 48 The Dietary Guidelines for Americans recommend eating two servings (eight ounces) of fish every week.49 Anyone who doesn’t can get extra omega-3 support by taking a krill oil supplement.

Omega-3s lower your triglyceride levels and raise your “good” cholesterol (HDL) levels.50 A study published in 2022 found that krill oil is a particularly effective source of heart-healthy omega-3s, safely regulating triglyceride levels in patients with severely high triglycerides.51 Anyone with high cholesterol — especially high triglycerides — may benefit from adding a krill oil supplement to their daily routine.

Pregnant people need extra omega-3 in their diets to help support their growing fetus’s brain and retinal development.23 Krill oil provides a nice boost without worrying about potential mercury exposure (though fish oil is also tested to guarantee no traces of mercury).52

There isn’t as much research on krill oil’s specific health benefits yet. However, a significant body of research on fish oil’s benefits is very close to what you might find in krill oil. Krill oil’s phospholipid content makes it potentially more bioavailable than fish oil.25 53 54 Some other health aspects that krill oil might improve include:

• Risk of cardiovascular disease63
• High blood pressure64
• PMS symptoms and dysmenorrhea65
• Non-alcoholic fatty liver66
• Inflammation67
• Joint pain and arthritis68 69
• Eye health70
• Mental health concerns71
• Cognitive function72
• Skin health73

Recommended doses

There’s very little information about recommended doses of krill oil and its beneficial compounds. Since the FDA doesn’t regulate krill oil in the same way they regulate food or prescription medications, it’s up to clinical researchers and krill oil manufacturers to determine and set appropriate doses and guidelines determined by the safety and efficacy findings in clinical research.

We’ve put together information on the suggested daily doses (based on research) of krill oil’s major nutrients in the chart below. This chart does not include DPA and phospholipids as there is no scientific consensus on how much should be consumed daily.

The current scientific consensus is that krill oil is a slightly safer alternative to fish oil. Fish oil is already a particularly safe supplement since it’s made exclusively from something that is and should be regularly consumed as part of a balanced diet. It also has “Generally Recognized as Safe” (GRAS) status in the United States.

Krill oil has almost no side effects. However, like fish oil, there is a chance that krill oil can slow the rate of blood clotting. Marine sources of omega-3 are more likely than other kinds of omega-3 to have anticoagulant effects, and while studies show mixed results, reach out to your doctor if you have a bleeding disorder or take anticoagulants and want to try krill oil.29 Likely, your doctor will also suggest avoiding krill oil in the few weeks before and after surgery.

Warnings

Don’t take krill oil if you’re allergic to fish or shellfish. Some krill oil brands use marine gelatin in their capsules, so be sure to read the ingredients to double-check. Children over the age of four can take krill oil in small doses, which may help their brains continue to develop normally.59 Reach out to your family pediatrician if you’re interested, as there aren’t formal rules and recommendations around omega-3 dosing for children.

If you’re pregnant or lactating, check in with your doctor before beginning a krill oil supplement. It may be a better alternative to fish oil to help you get your necessary daily dose of omega-3s. A 2018 study found that lactating parents taking krill oil passed on more EPA and DHA to nursing babies, helping their long-term brain development.60

Best overall

NatureMyst’s Krill Oil stands out as one of the most potent options we found throughout our research for a fraction of the cost. 1MD Nutrition’s KrillMD ($50) is similarly potent, just in different ways; it offers more phospholipids and astaxanthin, while NatureMyst ($20) gives you more omega-3s. In total, NatureMyst provides 1,000mg of krill oil, of which 340mg are omega-3s (230mg EPA and 110mg DHA), 450mg are phospholipids, and 1.5mg (1,500mcg) is astaxanthin.

When it comes to safety and sustainability, NatureMyst has received certification for sustainability from Friend of the Sea, and its krill oil is produced in a U.S. GMP-certified facility, ensuring adherence to good manufacturing practices. To guarantee purity, potency, and overall quality, the supplement undergoes thorough third-party testing. However, the brand hasn’t disclosed testing results or the third party conducting the testing.

When we tried the softgels ourselves, the small size made the two-pill serving easy to swallow, and none of our testers experienced any fishy burps or aftertaste. This could be due to the capsules being enteric coated, a material that protects pills from your stomach acid and essentially turns the capsules into slow-release ones (minimizing any fishy aftertaste).

Pricing

A single bottle of NatureMyst Krill Oil costs $19.99 from the brand’s website or $18.99 on Amazon when you Subscribe & Save. NatureMyst offers free shipping on orders over $50; if you don’t meet that amount, the least expensive shipping option (USPS First Class) is $3.90.

Best budget pick

If you’re looking to buy krill in bulk at the lowest possible price, Costco’s in-house brand, Kirkland Signature may be the ideal choice for you.

One serving of this brand’s krill oil is one softgel containing:

• 500mg krill oil
• 120mg total omega-3
• 60mg EPA
• 30mg DHA
• 200mg phospholipids
• 150mcg astaxanthin

This isn’t a lot. If you already eat some omega-3-containing foods, this may be enough to help you fill the nutritional gap, similar to Sports Research’s Omega-3 Antarctic Krill Oil (also with only 120mg of omega-3s). But if you’re looking for a total dietary replacement, 120mg of omega-3s likely isn’t enough, considering the suggested daily dose is anywhere between 250mg and 500mg. To come close to these numbers, you’ll need to take two or three softgels a day. That cuts into some of Kirkland’s cost-effective bulk strategy, but you’ll still get more product for less than most of the competition. Taking three softgels a day, for example, drops the quantity to about 53 days’ worth at about $0.49 per serving. This is still a lower cost per serving than every other krill oil on our list, with Sports Research coming in second at about $0.52 per serving.

Another curious ingredient choice is the inclusion of vanillin ethanol (artificial vanilla extract). It’s easy to miss at the end of the additional ingredients list and likely serves to keep any potential fishy smell or taste at bay. Still, since krill oil is already relatively unscented, some may find it a little over-the-top. Our testers found the slight vanilla flavor in this supplement unsettling as it clashes with the very slight fishy taste, but this wasn’t the case with the vanilla flavoring in Onnit’s krill oil.

Kirkland Signature uses sustainable methods to catch the krill used for its oil. Friend of the Sea backs the company, and its krill oil supplement has been USP Verified. This means that the supplement is really made of what Kirkland Signature says it is, releases easily into the body, and is manufactured according to cGMP standards.

Pricing

One bottle of Kirkland Signature Krill Oil costs $24.99. Shipping on this item is always free from Costco’s website, and it’ll arrive at your door within 5-7 days of placing an order. There aren’t any subscription options (unless you order it from Amazon, which is more expensive), so you’re limited to manual purchases. However, if you have a Costco membership, you can also pick this krill oil up in any of Costco’s warehouses.

Most potent

If you want to get your omega-3s down quickly and painlessly, 1MD Nutrition offers a highly potent krill oil supplement called KrillMD. KrillMD offers 1,600mg of krill oil in every two-capsule serving. Of these, 320mg are omega-3s (including 174mg of EPA and 120mg of DHA). This is one of the highest ratios of EPA to DHA we’ve seen in krill oil supplements, providing an excellent balance between the two fatty acids — a close runner-up is our top pick, NatureMyst’s Krill Oil, which offers 230mg EPA and 110mg DHA. The KrillMD softgels themselves are relatively long, and taking two daily to get the full 1,600mg can be burdensome. But, considering that most other supplements max out at around 1,200mg of krill oil split between two capsules, the extra milligrams can make a big difference.

While 1MD Nutrition makes a few claims that it sustainably harvests its krill, there aren’t a lot of direct or clear details explaining how. Likewise, while the pills are made in the U.S. in a GMP-certified factory, it isn’t clear whether or not these supplements have been tested in-house or by an independent third party. It’d be nice to see a level of transparency similar to what Kori offers.

1MD Nutrition does offer more thorough information about what the nutrients in krill oil can potentially do for your body than its competitors. There’s a moving timeline on the KrillMD webpage, delineating what kinds of symptom relief you might experience at two weeks, one month, two months, and three months of taking KrillMD consistently. Most points on this timeline mention clinical research or studies, but we wish 1MD Nutrition provided the sources to back up the claims being made. Onnit, for instance, links to its information sources.

Pricing

1MD Nutrition offers several different bulk options with varying discounts. You can get bottles in sets of one, three, or six and as a one-time purchase or recurring subscription. The chart below can help you understand all of the different iterations and perks.

If you try 1MD Nutrition’s KrillMD and decide that it isn’t right for you, you can return it within 90 days of purchase for a full refund. You can send back an opened, partially full, or even an empty bottle and still get all of your money back, no questions asked.

Most sustainable

Kori is a supplement brand that exclusively sells krill oil. The company’s dedication is obvious from the start: everything you could possibly want to know about its krill oil — or krill oil in general — is available in easy-to-read charts, graphs, and pages across its website. For example, you can trace where the krill in your daily supplement came from using a QR code or the lot number. You can also read about the company’s sustainability certifications.

Sustainability is something that Kori goes above and beyond to emphasize in its Krill Oil. The company plainly explains how its eco-harvesting methods work (a small underwater vacuum fitted with a baleen-like mesh filter to only catch krill, inspired by whales’ method of catching krill) and walks customers through every step taken to preserve Antarctic krill populations and surrounding ecosystems.

Kori, like Sports Research, also uses Superba 2 krill. This krill comes from Superba Krill, a third-party krill oil supplement supplier that runs the most sustainable fishery according to the Sustainable Fisheries Partnership. All Superba products are MSC and Friend of the Sea-certified sustainable. If you go through Superba's website, all krill oil batches are fully traceable back to the original harvest location.

Even Kori’s packaging is 100% recyclable, including the bottle cap. Considering the company also partners with three conservation organizations, has an A-rating with the Sustainable Fisheries Partnership, and relies on a third party to watch its krill harvesting, it’s safe to say that Kori truly believes in its mission and takes steps to make it happen.

Kori’s Krill Oil, made from Antarctic krill, comes in three different sizes. All of the brand’s Antarctic krill oil supplements have the same recommended dose: 1,200mg daily. However, one 1,200mg standard softgel is quite large, measuring about the same height and most of the width of a quarter.

If you know that’s going to be difficult for you to take every day, Kori makes two other sizes of softgels for the same price at the same doses; Sports Research is the only other brand we mention in our guide that provides this type of flexibility.

Every bottle contains 30 servings or a month’s supply.

There are no additional ingredients in Kori’s Krill Oil, including flavorings or additives. Several other krill oil supplements, such as 1MD Nutrition’s KrillMD, include small amounts of flavoring to offset the chances of any fishy taste peeking through. 1MD Nutrition uses natural lemon flavoring, for example, and Purity Products uses natural lemon lime. However, despite the lack of flavoring in Kori’s Krill Oil, our testers didn’t experience any fishy aftertaste.

Pricing

No matter what size pill you order, every bottle of Kori’s Krill Oil Softgels costs $19.99. You can join its subscription program for 10% off, dropping the price to $17.99. Kori fulfills subscriptions through the third-party program Recharge, and you can set deliveries to occur as frequently (or infrequently) as you want — cancel, skip, or delay deliveries without hassle or penalties.

Kori Krill Oil can be found on its website, as well as in several major retailers in-person and online.

If you make your purchase through Kori’s website, free shipping unlocks with any two items. If you’re only interested in one bottle, there’s a $4.99 flat shipping fee. For the time being, Kori only ships to the United States.

Best for heart health, best krill-fish oil blend

If you’re looking for a krill oil supplement with additional heart-healthy benefits, then Purity Products’ Krill Omega 50+ could be a good option for you. On top of having a high dose of its krill and fish oil blend (1,300mg), this supplement contains 100mg of CoQ10, an antioxidant with some research studies suggesting it has “significant cardiovascular protective effects” against cardiovascular disease.61

The krill and fish oil blend, “PhosphoBoost”, in this supplement is made up of:

• 500mg omega-3s from fish oil
• 120mg omega-3s from krill oil
• 270mg of EPA
• 270mg of DHA
• 80mg of “other” omega-3 fatty acids
• 280mg of phospholipids

Additionally, Krill Omega 50+ has 500mcg of astaxanthin (a third of what you’d get from NatureMyst’s) and 12.5mcg of vitamin D3. The inclusion of D3 could be due to The Vitamin D and Omega-3 Trial (VITAL), a large-scale trial that aimed to determine the potential cardiovascular and cancer benefits of this combo. Unfortunately, the results of the trial showed no benefit in the prevention of cardiovascular or cancer events.62

Pricing

Purity Products has a Subscribe & Save option where you can save up to 27% on any product. While this is a bit of an odd savings percentage, it’s at least more than some other brands, like Kori and Onnit (10%). For its Krill Omega 50+, the prices are as follows:

• One-time purchase: $54.95
• Subscribe & Save: $39.95 (no matter how many bottles)

It’s a bit disappointing to us that the price per bottle doesn’t change when you add additional units to your subscription. 1MD Nutrition, for instance, has incremental savings depending on the quantity you purchase.

When it comes to customer policies, Purity Products “cheerfully” provides refunds on any bottle returned within 60 days. And, like Onnit, the company offers a military discount. The least expensive delivery option is $6.95, with no apparent way to earn free shipping.

The krill oil products in this section didn’t quite earn a spot in our top picks, but they still offer decent amounts of nutrients and some brands have unique aspects or benefits that may appeal to you. Onnit, for instance, offers a "Keep It" money-back guarantee that allows you to keep the first purchase of your applicable order no matter what — meaning there’s no messing with returns (you just need to try the supplement for at least two weeks or wait until two weeks after it’s been delivered before initiating a refund).

The chart below contains information on our honorable mention choices. As with the chart comparing our top picks, the prices are based on single-item purchases.

Onnit Krill Oil

Known for its athletic and nootropic supplements, Onnit’s Krill Oil provides 1,000mg of krill oil and 240mg of omega-3 fatty acids, including 130mg EPA and 60mg DHA. While this isn’t the most EPA and DHA we’ve seen on our list (Purity Products earns that title with 270mg of each in its Krill Omega 50+). Onnit’s Krill Oil also offers a phospholipid serving equivalent to our top pick, NatureMyst. Both don’t meet the levels of 1MD Nutrition (550mg) or Kori (480mg), but it’s still a decently high serving compared to many competitors.

These krill oil softgels do include ethyl vanillin (artificial vanilla extract) to minimize any potential fishy taste. Our testers found that it did mask the taste relatively well (unlike the vanilla in Kirkland Signature’s), leaving no aquatic remnants behind in their mouths or later in burps. It’s unclear if this krill oil has been tested, as an unnamed third party has supplied it. However, said third party has been certified by Friend of the Sea, so it’s likely that the supplement has also been tested for clarity.

Each significant bit of scientific information on Onnit’s page links to the scientific study it references, providing important clinical sources — this is in direct contrast to how 1MD Nutrition mentions studies but doesn’t link to them.

Onnit’s Krill Oil comes in one 60-count bottle. A one-time purchase costs $29.95, but you can join the Subscribe & Save program for a 15% discount (for a new price of $25.46). With a subscription, you can choose to have your Krill Oil delivered every:

• 7 days
• 15 days
• 30 days
• 45 days
• 60 days
• 90 days

Onnit will deliver up to five bottles of Krill Oil at your specified interval. There are no free shipping benefits unique to the subscription plan, so no matter what or how you order, expect to pay for shipping (or put together a basket worth $150 or more to unlock free shipping to the contiguous United States, a much higher threshold to hit compared to other brands like Viva Naturals or Sports Research). Shipping prices vary depending on your location and method of choice, but our testers found they varied between $7 and $11. Plus, if you’re a first responder, medical professional, or part of the military, you can take an extra 15% off everything.

If you need to return your Krill Oil, you can reach out to Onnit’s team for a full refund within 90 days of purchase. The company’s Keep It money-back guarantee allows you to keep the bottle, meaning there’s no messing with returns or shipping prices. The one drawback of this is that you must try the supplement for at least two weeks (or wait two weeks after it’s been delivered) before you can initiate a refund.

Viva Naturals Krill Oil

Viva Naturals Antarctic Krill Oil is a sustainably-harvested option that provides 1,250mg of krill oil per two-capsule serving. It only provides you with 330mg total per serving (165mg of EPA and 90mg of DHA), but it’s higher than some other brands, like Onnit and Sports Research. The supplement may be better known for its 1.6mg (1,600mcg) of astaxanthin, almost ten times more than the 200mcg dose in Onnit’s formula and 0.1mg higher than in our top pick, NatureMyst’s, krill oil.

Viva Naturals’ capsules are made from fish gelatin, so those who don’t eat beef or cow products can still safely take this supplement.

IKOS (International Krill Oil Standards) is the krill equivalent of the International Fish Oil Standards and is equally acclaimed in the world of krill oil. Viva Naturals boasts the only krill oil supplement that is certified by IKOS. It’s also tested by some third-party independent testers. Viva Naturals is also one of the more transparent companies about this testing procedure on our list, stating it outright several times (though you can’t access any Certificates of Analysis for the product like you can with Kori).

Each bottle of Viva Naturals Krill Oil contains 30 servings, or one month, of krill oil. You can order one, four, or six bottles at a time. There are no bulk bundle deals, but joining Viva Naturals’ subscription program will save you 10% no matter how many containers you order.

Free shipping kicks in when your order costs more than $79, so any of Viva Naturals’ four- or six-bottle bundles will ship for free. If you just want one bottle, shipping costs vary depending on how fast you want your package. Standard shipping (5-7 days) for one container of Krill Oil costs $5.95 no matter where in the United States you are.

Should you try your Krill Oil and not like it, you can get a full refund within 90 days of purchase. However, there are a few caveats. Viva Naturals will only give a refund on orders less than $100 and for first-time product purchases. So, if you try your Krill Oil and it agrees with you the first month, but you develop digestive problems down the road when on your second bottle, you won’t be able to get a refund at that point. This is one of the weaker refund policies we’ve come across, especially when compared to what companies like 1MD Nutrition or Onnit offer.

Sports Research Omega-3 Antarctic Krill Oil with Superba2

Sports Research, like Kori, offers krill oil supplements with more than one pill size or dose. However, those numbers get a little messy relatively fast. You can order:

• 60 softgels of 1,000mg
• 120 softgels of 500mg

Doing some quick math reveals that there is still the same total amount of krill oil per bottle in either size. While Sports Research suggests that one serving is one capsule for both, the smaller softgel is only 500mg (half the amount in the 60-count). So, to get the same amount from the 120-count, you will need to take two capsules.

These capsules include 68-136mg of EPA and 30-60mg of DHA each. Like several other krill oil supplements, such as Kirkland Signature’s, these numbers aren’t as strong as they could be, particularly for DHA. In this case, Sports Research’s Krill Oil could be a good option if you want to bulk up a diet that already has some omega-3s in it. Bear in mind that the capsules have a tendency to leak, and the red oil can stain, which is why we’ve relegated them to our honorable mentions category.

Sports Research’s krill oil is certified sustainable with MSC and, like Kori, uses Superba2 krill. The company also provides you with lot numbers, so you can access the third-party testing results for your supplement (which we always appreciate being available).

There’s a slight price difference between the 500mg and 1,000mg softgel options from Sports Research. Combine that with the 15% subscription discount, and figuring out your best deal can get complicated. We break down the varying costs in the chart below.

Shipping costs a flat rate of $7.50 unless you opt for expedited shipping, which varies depending on what you’ve ordered and where it’s being delivered. You can unlock free shipping with any order that costs more than $75 in total. It’s also important to note that Sports Research’s shipping platform doesn’t recognize special characters, so be sure not to include emojis or characters outside of the English alphabet and numerals. The company will cancel your order if you include these.

If you try Sports Research’s Krill Oil and don’t like it, you can get a refund by shipping the bottle back to the company within 90 days of purchase. You won’t get a full refund, as the cost of return shipping ($7.50) is taken out. Additionally, refunds are only accepted from customers living in the United States.