Krill oil and fish oil are both omega-3 supplements that can provide EPA and DHA, but they are not the same. Fish oil is usually easier to find, often provides higher EPA/DHA amounts per serving, and has more product variety. Krill oil is usually marketed around smaller softgels, phospholipid-form omega-3s, and naturally occurring astaxanthin.

For the full category overview, see our guide to the best omega-3 supplements.

Quick Answer

Choose fish oil if you want higher EPA/DHA amounts per serving, wider product availability, more budget options, and easier label comparisons.

Consider krill oil if you prefer smaller softgels, want to compare phospholipid-form omega-3s, or dislike traditional fish oil capsules.

Best choice for most buyers: Fish oil is usually the better first comparison because it is easier to find, easier to compare by EPA/DHA amount, and often more cost-effective.

Important: Krill oil is not automatically superior. Always compare EPA/DHA amount, serving size, allergen warnings, testing, and price per serving.In this guide:

Quick Comparison
What Is Fish Oil?
What Is Krill Oil?
EPA/DHA Content
Phospholipid vs Triglyceride Forms
Price and Value
Softgel Size and Taste
Which One Should You Choose?
Safety Notes
Red Flags
Helpful Next Reads
FAQ
Sources

Krill Oil vs Fish Oil: Quick Comparison

Factor	Fish Oil	Krill Oil	Practical Winner
Common omega-3s	EPA and DHA	EPA and DHA	Tie — check the label
EPA/DHA amount per serving	Often higher, especially in concentrated fish oil products	Often lower per serving, depending on product	Fish oil
Omega-3 form	Often triglyceride or ethyl ester depending on product	Often phospholipid form	Depends on label and preference
Softgel size	Can be large	Often smaller	Krill oil
Price per EPA/DHA amount	Usually better value	Often more expensive	Fish oil
Allergen concern	Fish allergy concern	Shellfish/crustacean allergy concern	Depends on allergy profile
Product variety	Very wide: softgels, liquid, high-potency, enteric-coated	Usually softgels	Fish oil
Best beginner choice	Easier to compare and usually better value	Good if softgel size matters more	Fish oil for most buyers

Plain-English takeaway: Krill oil may be more convenient for some users, but fish oil usually gives you more EPA/DHA choices and better value. Compare the actual Supplement Facts label before deciding.

What Is Fish Oil?

Fish oil is oil derived from fish. In supplements, fish oil is commonly used as a source of EPA and DHA omega-3 fatty acids. It usually comes as softgels or liquid fish oil.

Fish oil products vary a lot. Some are basic and budget-friendly. Others are concentrated, enteric-coated, liquid, flavored, third-party tested, or premium-positioned.

Fish oil may be a good fit if you want:

Higher EPA/DHA amounts per serving
More product options on Amazon
Better price per EPA/DHA amount
Liquid fish oil options
Enteric-coated softgels
Clear comparison across many brands

Best fit: Fish oil is usually the better first choice for buyers who want broad availability, clear EPA/DHA comparisons, and better value.

What Is Krill Oil?

Krill oil is derived from krill, small crustaceans found in ocean ecosystems. Like fish oil, krill oil can provide EPA and DHA, but krill oil is commonly marketed around omega-3s in phospholipid form and naturally occurring astaxanthin.

Krill oil softgels are often smaller than fish oil softgels, which can make them appealing to people who dislike swallowing large capsules. However, smaller softgels can also mean lower EPA/DHA per serving, depending on the product.

Krill oil may be a good fit if you want:

Smaller softgels
A krill-based omega-3 source
To compare phospholipid-form omega-3 products
A product that may feel easier to take than large fish oil capsules
A supplement that includes naturally occurring astaxanthin

Important: Krill oil comes from crustaceans. People with shellfish or crustacean allergy concerns should ask a healthcare professional before using krill oil.

EPA/DHA Content: Which Usually Gives More?

When comparing krill oil vs fish oil, the most important practical question is often EPA/DHA content per serving.

Fish oil products often provide higher EPA and DHA amounts per serving, especially concentrated fish oil products. Krill oil products may provide less EPA/DHA per serving, although this depends on the product and serving size.

Label Detail	Why It Matters
Total oil amount	Fish oil or krill oil milligrams do not equal EPA/DHA milligrams.
EPA amount	Shows how much EPA you get per serving.
DHA amount	Shows how much DHA you get per serving.
Total omega-3s	Helpful, but still check the EPA and DHA breakdown.
Serving size	One product may list values per one softgel; another may require two or three softgels.
Cost per serving	Important for comparing fish oil and krill oil fairly.

Common mistake: Do not compare “1000 mg fish oil” against “1000 mg krill oil” without checking EPA and DHA amounts. The active omega-3 content can be very different.

Phospholipid vs Triglyceride Forms

Krill oil is often marketed around omega-3s in phospholipid form. Fish oil products may come in different forms depending on the product, including triglyceride form, re-esterified triglyceride form, or ethyl ester form.

This can sound technical, and many brands use it heavily in marketing. But for a clean buying guide, it is safer to keep the advice practical: compare EPA/DHA amount, product testing, freshness, serving size, tolerability, and price.

What this means for buyers

Krill oil may appeal to people who want to compare phospholipid-form omega-3s.
Fish oil may appeal to people who want higher EPA/DHA amounts per serving.
The form alone does not make a product automatically better.
Testing and label transparency still matter.
Do not pay extra unless the label and serving size make sense.

Simple rule: Form matters, but it should not distract you from the basics: EPA, DHA, serving size, purity testing, freshness, allergens, and value.

Price and Value

Fish oil usually wins on value. There are more fish oil products, more high-potency options, more budget options, and more formats. This makes it easier to compare price per serving and price per EPA/DHA amount.

Krill oil is often more expensive per serving, especially when you compare the actual EPA and DHA amount. Some buyers may still prefer krill oil because of smaller softgels or personal tolerance, but it should not be treated as automatically better.

How to compare value fairly

Compare EPA + DHA per serving.
Check how many softgels equal one serving.
Compare servings per bottle.
Compare price per serving.
Compare price per EPA/DHA amount, not just price per bottle.
Check testing and freshness information.
Verify the Amazon seller before buying.

Value Verdict

Fish oil usually offers better value for buyers focused on EPA/DHA amount. Krill oil may be worth comparing if convenience, softgel size, or personal preference matters more than cost.

Softgel Size, Taste, and Convenience

One reason people compare krill oil vs fish oil is capsule size. Fish oil softgels can be large, especially high-potency options. Krill oil softgels are often smaller, which may be easier for some people to take.

Fish oil can also cause fishy aftertaste for some users. Enteric-coated fish oil, liquid fish oil, taking fish oil with food, or switching to a different format may help some people. Krill oil is often marketed as having less fishy aftertaste, but individual experience varies.

✅ Fish Oil Convenience Tips

Try enteric-coated softgels if aftertaste bothers you.
Compare liquid fish oil if capsules are too large.
Take with food if tolerated better that way.
Check softgel count per serving.

✅ Krill Oil Convenience Tips

Compare softgel size if swallowing capsules is an issue.
Check EPA/DHA amount carefully.
Check shellfish allergy warnings.
Compare cost per serving.

Which One Should You Choose?

The best choice depends on what you actually need from an omega-3 supplement.

Choose This	If You…
Fish Oil	Want higher EPA/DHA amounts per serving and better value.
Fish Oil	Want more product options, including high-potency, liquid, or enteric-coated formats.
Fish Oil	Want easier label comparison across many brands.
Krill Oil	Prefer smaller softgels and are comfortable paying more per serving.
Krill Oil	Want to compare phospholipid-form omega-3 supplements.
Neither	Have fish, shellfish, or seafood allergy concerns without professional guidance.
Algae Oil	Want a vegan, vegetarian, or fish-free EPA/DHA source.

Best for Most Buyers

Fish oil is usually the stronger first comparison because it is easier to find, easier to compare, and often better value for EPA/DHA.See Best Fish Oil Supplements

Best for Smaller Softgels

Krill oil may be worth comparing if you dislike large fish oil capsules and want a krill-based option.Check Krill Oil on Amazon

Krill Oil vs Fish Oil for Beginners

Beginners should usually start by learning how to read omega-3 labels. The most important beginner skill is knowing the difference between total oil amount and EPA/DHA amount.

For many beginners, fish oil is easier to compare because there are more products with clear EPA/DHA amounts and third-party testing signals. Krill oil can still be considered, but buyers should be careful not to assume smaller softgels mean better omega-3 value.

Beginner recommendation: Start by comparing EPA + DHA per serving, testing, allergens, serving size, and seller reliability. Do not choose based only on “fish oil” or “krill oil” marketing.

What About Algae Oil?

If you avoid fish and shellfish, algae oil may be the better omega-3 supplement category to compare. Algae oil can provide DHA, and some products provide both DHA and EPA.

Algae oil is usually more expensive than basic fish oil, but it is useful for vegan, vegetarian, or fish-free routines.

Fish-free note: Krill oil is not vegan or vegetarian. If you want a fish-free or seafood-free omega-3 source, compare algae oil products instead.

⚠️ Safety Notes Before Buying Krill Oil or Fish Oil

Krill oil and fish oil supplements are common, but they require careful label checks and safety awareness. This is especially important for people using medications, preparing for surgery, pregnant or nursing individuals, and people with fish or shellfish allergies.

Ask a healthcare professional first if you:

Take blood-thinning medication or have a bleeding disorder
Are preparing for surgery or a medical procedure
Have a fish allergy
Have a shellfish or crustacean allergy
Are pregnant, nursing, or trying to conceive
Take prescription medication
Have a medical condition requiring supervised nutrition
Are considering high-dose omega-3 use

Common tolerance issues

Fishy burps: More common with some fish oil products; enteric-coated options may help some users.
Stomach discomfort: Taking omega-3 supplements with food may be easier for some people.
Large softgels: Krill oil softgels are often smaller, while fish oil has liquid alternatives.
Allergens: Fish oil and krill oil have different allergy concerns.
High-potency products: More EPA/DHA is not automatically better for everyone.

Safety-first note: Do not use fish oil or krill oil as a substitute for medical care or prescribed treatment. If you have heart-health concerns, cholesterol concerns, inflammation concerns, medication use, allergy concerns, or surgery plans, speak with a qualified healthcare professional.

Krill Oil and Fish Oil Red Flags to Avoid

A clean omega-3 comparison should help readers avoid hype. Watch out for these red flags:

“FDA approved supplement” claims: Dietary supplements are not FDA-approved in the same way prescription drugs are approved.
No EPA/DHA breakdown: Avoid products that only list total oil without EPA and DHA details.
“Krill is always better” claims: Krill oil is not automatically superior to fish oil.
Disease-treatment claims: Avoid products claiming to treat heart disease, cholesterol problems, inflammation-related conditions, brain disorders, or joint disease.
No purity or freshness information: Omega-3 oils should have clear quality signals.
No Supplement Facts label: You should be able to see exactly what you are buying.
Ignoring allergens: Fish oil and krill oil have different allergy concerns.
Suspicious Amazon sellers: Check seller details, product photos, expiration information, and recent reviews.
High-dose use without guidance: More omega-3 is not automatically better.

Best Buying Approach

If you are comparing krill oil vs fish oil, use this buying flow:

Check whether you have fish, shellfish, or seafood allergy concerns.
Compare EPA amount per serving.
Compare DHA amount per serving.
Check total omega-3s per serving.
Confirm serving size and number of softgels needed.
Compare cost per serving and cost per EPA/DHA amount.
Look for purity, freshness, or third-party testing signals.
Check softgel size if swallowing capsules is an issue.
Avoid disease-treatment claims.
Verify the Amazon seller before buying or adding an affiliate link.

Editorial Recommendation

For most buyers, fish oil is the better first comparison because it usually offers more EPA/DHA options, better value, and easier label comparison. Krill oil can be worth comparing if softgel size and personal preference matter more than cost per EPA/DHA amount.

Helpful Next Reads

Use these guides to compare actual omega-3 products and strengthen the internal linking across this cluster:

Final Takeaway

Krill oil and fish oil can both provide omega-3s, but fish oil usually wins on EPA/DHA amount, product variety, and value. Krill oil may win on smaller softgel convenience and personal preference.

Bottom Line

Do not choose based only on “krill” or “fish oil” marketing. Compare EPA, DHA, total omega-3s, source, serving size, testing, allergens, softgel size, and seller reliability before buying.

FAQ: Krill Oil vs Fish Oil

Is krill oil better than fish oil?

Not automatically. Krill oil is often marketed around phospholipid-form omega-3s and smaller softgels, but fish oil usually offers more EPA/DHA options and better value. Compare the actual label before deciding. Does krill oil have EPA and DHA?

Many krill oil supplements provide EPA and DHA, but the amounts vary by product. Always check the Supplement Facts label. Does fish oil have more EPA and DHA than krill oil?

Fish oil products often provide higher EPA/DHA amounts per serving, especially concentrated fish oil supplements. However, exact amounts depend on the product and serving size. Why are krill oil softgels often smaller?

Krill oil products are often sold in smaller softgels, which can be easier to swallow. However, smaller softgels may also provide lower EPA/DHA amounts, so the label still matters. Is krill oil safer than fish oil?

Not necessarily. Krill oil and fish oil have different allergen concerns. Krill oil may be a concern for people with shellfish or crustacean allergies, while fish oil may be a concern for people with fish allergies. Can krill oil or fish oil support heart health?

Krill oil and fish oil can provide EPA and DHA as part of general nutrition, but dietary supplements should not be marketed as treatments or preventions for heart disease. Speak with a healthcare professional for personal medical guidance. Can I take krill oil or fish oil with blood thinners?

Ask a healthcare professional first. Omega-3 supplements may not be appropriate for everyone using blood-thinning medication or preparing for surgery. Is krill oil vegan?

No. Krill oil comes from krill, which are small crustaceans. If you want a vegan omega-3 supplement, compare algae oil products instead. Is fish oil vegan?

No. Fish oil is derived from fish. Vegan or fish-free buyers should compare algae oil omega-3 supplements. Is omega-3 FDA approved?

No dietary supplement should be marketed as “FDA approved” in the same way prescription drugs are approved. Look for transparent labels, realistic claims, credible testing, allergen information, and reliable sellers instead. What should I avoid when buying krill oil or fish oil?

Avoid unclear EPA/DHA amounts, missing Supplement Facts labels, no purity or freshness information, suspicious sellers, allergy risks, and products making disease-treatment promises.

Sources and References

These sources are included for educational context and supplement-safety guidance. Product labels, serving sizes, formulas, certifications, and seller details can change over time, so always check the current label before buying.

Editorial note: This article is designed as a supplement education and buying guide. It does not provide medical diagnosis, treatment advice, heart-health treatment advice, cholesterol advice, inflammation advice, or personalized nutrition recommendations. Always check the current product label, serving size, allergens, testing status, seller, and warnings before purchase.

Krill Oil vs Fish Oil: Which Omega-3 Supplement Is Better?