Fish Oil vs Krill Oil
Both give you omega-3. But they're absorbed differently, cost differently, and have different strengths. Here's a simple comparison.
Fish oil and krill oil both deliver EPA and DHA — the two omega-3 fatty acids that matter. The main differences are absorption form, astaxanthin content, and cost. For most people in India, high-quality fish oil is the better value.
This guide is for you if: You're trying to choose between fish oil and krill oil, want to know if the price difference is worth it, or want the most cost-effective way to raise your omega-3 index.
See the evidenceQuick verdict
Fish oil wins on value and dose. A high-quality fish oil concentrate (like 1,000 mg EPA/DHA per serving) gives you more omega-3 per rupee than krill oil. Krill oil has slightly better absorption per milligram and contains natural astaxanthin, but you'd need to take many more capsules to match the EPA/DHA dose of a good fish oil.
If you can only afford one: fish oil. If you have the budget and want the absorption edge: krill oil is a valid choice.
Head-to-head comparison
| Fish Oil | Krill Oil | |
|---|---|---|
| Omega-3 form | Triglyceride (or ethyl ester) | Phospholipid |
| EPA+DHA per serving | 500–1,000 mg typical | 100–250 mg typical |
| Absorption | Good (better with food) | Slightly better per mg |
| Astaxanthin | None | Yes (natural antioxidant) |
| Burping/aftertaste | Sometimes (enteric coating helps) | Less common |
| Cost (India) | ₹500–1,500/month | ₹2,000–4,000/month |
| Sustainability | Varies by source | Generally well-managed |
The absolute amount of EPA and DHA you take matters more than the form. 1,000 mg EPA/DHA from fish oil will do more for your omega-3 index than 200 mg from krill oil — even if krill is slightly better absorbed per milligram. Dose trumps form.
When to choose each
- Choose fish oil if: You want the most EPA/DHA per rupee, need higher doses (heart health, inflammation), or are on a budget. Look for triglyceride form with at least 60% EPA+DHA concentration.
- Choose krill oil if: You can't tolerate fish oil (burping), want the added astaxanthin, don't need high doses, or prefer smaller capsules.
- Skip both if: You eat fatty fish 3–4 times per week (salmon, sardines, mackerel) — you're likely getting enough from diet.
Track your omega-3 index to know if your supplement is working
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Get early accessFrequently Asked Questions
Is krill oil really better absorbed than fish oil?
Per milligram of omega-3, krill oil does show slightly better absorption because the EPA/DHA are bound to phospholipids. However, fish oil capsules contain 3–5x more EPA/DHA per serving. When you compare equal doses of EPA+DHA, the total benefit is similar. Don't pay 3x more for krill oil thinking it's 3x better — it's not.
How much omega-3 do I actually need?
For general health, aim for 1,000–2,000 mg of combined EPA+DHA daily. For heart health or reducing inflammation, 2,000–3,000 mg. Most Indian diets provide less than 200 mg/day. Your omega-3 index (a blood test) should be 8% or higher — most Indians are between 3–5%.
Does fish oil cause mercury contamination?
Reputable fish oil brands undergo molecular distillation that removes mercury, PCBs, and other contaminants to undetectable levels. This is actually safer than eating large predatory fish directly. Look for brands that publish third-party testing (IFOS certification). Krill oil naturally has very low mercury since krill are at the bottom of the food chain.
Can vegetarians get enough omega-3 without fish or krill oil?
Algae oil is the vegetarian alternative — it provides DHA and some EPA directly, without fish. It's more expensive but effective. ALA from flaxseed and walnuts converts very poorly to EPA/DHA (less than 5%), so plant sources alone won't adequately raise your omega-3 index.
The science of omega-3 absorption
Phospholipid vs triglyceride forms: In krill oil, omega-3s are esterified to phospholipids (mainly phosphatidylcholine), which are directly incorporated into cell membranes. Fish oil omega-3s are in triglyceride or ethyl ester form, which must be processed by pancreatic lipase before absorption. This gives krill a theoretical absorption advantage.
However, a 2013 study (Schuchardt et al.) found that while krill oil produced a higher AUC of EPA per mg, the practical difference was modest when accounting for the much higher EPA/DHA content in fish oil capsules. A 2015 meta-analysis concluded that the omega-3 index increase per gram of EPA+DHA was not significantly different between forms.
Astaxanthin in krill oil: Krill oil naturally contains astaxanthin, a potent carotenoid antioxidant that gives it its red colour. While this provides some additional antioxidant benefits, the dose is small (typically 0.5–1 mg per capsule). Dedicated astaxanthin supplements provide 4–12 mg for those wanting this specific benefit.
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