Krill Oil

KRILL OIL is extracted from ANTARCTIC KRILL (EUPHAUSIA SUPERBA) — small shrimp-like CRUSTACEANS that form the FOUNDATION of the Southern Ocean food web (consumed by whales, penguins, seals, fish). Krill harvesting occurs in regulated zones with quotas; sustainability and ecosystem impact concerns are significant.

KEY DISTINCTION FROM FISH OIL: in krill oil, EPA and DHA are bound to PHOSPHOLIPIDS (mostly phosphatidylcholine) rather than triglycerides — this affects absorption and tissue distribution. ADDITIONAL ACTIVE: NATURALLY-OCCURRING ASTAXANTHIN (red carotenoid antioxidant) — 0.5-1.5 mg per gram krill oil typical. Phospholipids and astaxanthin give krill oil its characteristic red-pink color.

EVIDENCE-BASED USES: (1) Triglyceride reduction (similar to fish oil at lower doses); (2) BETTER BIOAVAILABILITY than fish oil per gram of EPA+DHA; (3) BETTER GI TOLERABILITY than fish oil; (4) PMS/dysmenorrhea (Sampalis 2003); (5) Joint health adjunct (Deutsch 2007); (6) General omega-3 supplementation.

CRITICAL CAUTIONS: (1) SHELLFISH ALLERGY — krill ARE CRUSTACEANS; cross-reactive with shrimp, lobster, crab; AVOID with known shellfish allergy; people with severe shellfish allergy should not consume krill oil; people with mild shellfish allergy should consult allergist; (2) SUSTAINABILITY / ECOSYSTEM IMPACT — Antarctic krill are foundation of Southern Ocean food web; extensive harvesting raises ecosystem concerns; choose brands with sustainability certifications (MSC, Friend of the Sea, ASC); some prefer fish oil from sustainable small-fish sources for ecological reasons; (3) COST — krill oil typically MORE EXPENSIVE than fish oil per gram of EPA+DHA; better bioavailability may partially compensate but not eliminate cost differential; (4) LOWER EPA+DHA PER CAPSULE — krill oil typically contains ~200-300 mg EPA+DHA per gram (vs 600+ mg per gram in concentrated fish oil); for high-dose applications (hypertriglyceridemia, post-MI CV risk reduction), fish oil more practical; (5) DOSE — 1-3 g/day krill oil (delivers ~200-600 mg EPA+DHA); for similar therapeutic effect to higher fish oil doses, may need higher krill oil doses (or accept that krill oil is for general health support, not high-dose therapy); (6) ASTAXANTHIN BENEFIT — astaxanthin is a strong antioxidant; provides additional value beyond just omega-3s; some users specifically choose krill oil for combined omega-3 + astaxanthin; (7) BLEEDING RISK — similar to fish oil at high doses; less concerning at typical krill oil doses; (8) PREGNANCY — fish oil more established for pregnancy DHA supplementation; krill oil reasonable but less data; specific concern about pregnancy: lower DHA content per gram than dedicated DHA supplement; (9) FORMS — krill oil is liquid in soft gels; pink-red color from astaxanthin; (10) STORAGE — refrigerate after opening; less prone to oxidation than fish oil due to natural astaxanthin antioxidant; (11) FOR FISH OIL INTOLERANCE — krill oil's better GI tolerability and lower fishy reflux make it good option for those who can't tolerate fish oil; (12) BIOAVAILABILITY ADVANTAGE — research shows krill oil produces higher omega-3 index per gram EPA+DHA than fish oil triglyceride or ethyl ester — practical implication: lower dose may be needed for similar tissue effect; (13) NEPTUNE KRILL OIL® / SUPERBA® / various brands — different processing methods affect quality, astaxanthin content, taste; reputable brands include third-party testing for purity, oxidation, heavy metals; (14) For ETHICAL/SUSTAINABILITY-MINDED CONSUMERS — consider whether Antarctic krill harvesting concerns warrant choice of fish oil instead; reasonable arguments either way.