Krill oil (NKO) — Phospholipid-Bound Omega-3s
Krill oil is an extract from Antarctic krill rich in omega-3 fatty acids (EPA and DHA) bound to phospholipids, alongside the antioxidant astaxanthin. Its unique phospholipid structure enhances bioavailability and cellular uptake compared to traditional fish oil, supporting cardiovascular health, cognitive function, and the reduction of systemic inflammation.
Mechanism of Action
The omega-3 fatty acids in krill oil are primarily bound to phosphatidylcholine, facilitating their incorporation into cell membranes and crossing the blood-brain barrier. EPA and DHA act as precursors to specialized pro-resolving mediators (SPMs) such as resolvins and protectins, which actively resolve inflammation. They also modulate gene expression by activating PPAR-alpha and downregulating NF-κB, thereby reducing the production of pro-inflammatory cytokines. The naturally occurring astaxanthin provides potent antioxidant protection against lipid peroxidation.
Human Trial Evidence
Numerous human trials demonstrate krill oil's efficacy in reducing triglycerides, lowering inflammatory markers such as C-reactive protein (CRP), and improving joint pain in osteoarthritis. Clinical studies have shown that krill oil significantly increases the Omega-3 Index, often more efficiently than standard fish oil at equivalent doses. Other trials have highlighted its benefits for cognitive function and premenstrual syndrome symptoms.
Dosing Protocol
Typical dosing ranges from 500 to 2,000 mg per day, depending on the therapeutic goal. For general health and cardiovascular support, 1,000 mg daily is common. It is best taken with meals to optimize absorption, though its phospholipid form makes it less dependent on dietary fat than triglyceride-based fish oils.
Safety & Contraindications
Krill oil is generally well-tolerated, with fewer gastrointestinal side effects compared to standard fish oil. It is contraindicated in individuals with crustacean shellfish allergies. High doses may have a mild blood-thinning effect, so caution is advised for those on anticoagulant medications or facing upcoming surgery.