Fish Oil vs Krill Oil: Which Is Better? (2025 Evidence Review)

Last updated: mayo 7, 2026
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Fish oil and krill oil both deliver EPA and DHA — but they’re structurally different, price differently by 3-5x, and have different bioavailability profiles. This comparison cuts through the marketing to tell you what the clinical data actually shows.

Quick Verdict

rTG Fish Oil wins on value. High-quality rTG fish oil has comparable or superior bioavailability to krill oil at 3–5x lower cost per gram of EPA+DHA. Krill oil’s phospholipid form is marginally better absorbed but doesn’t justify the price premium for most people.

Factor rTG Fish Oil Krill Oil
EPA+DHA per capsule 600–900mg 90–150mg
Cost per 1g EPA+DHA $0.15–0.30 $0.80–1.50
Bioavailability High (70% better than EE) Slightly higher than rTG
Fishy burps Minimal (rTG form) None
Astaxanthin No Yes (antioxidant)
Human RCTs 40+ 12+

When Krill Oil Makes Sense

If you have extreme fish oil sensitivity (burping despite rTG form), need the astaxanthin antioxidant specifically, or are supplementing a child (smaller doses work), krill oil is a reasonable choice. For everyone else, rTG fish oil delivers equivalent or better clinical outcomes at a fraction of the cost.

NordVital Recommendation

Buy the highest-quality rTG fish oil you can find and take 2g EPA+DHA daily. The rTG form eliminates the bioavailability gap versus krill oil while costing 3-5x less. Read our full review for the specific products with third-party purity certificates.

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