Astaxanthin
The deep-red carotenoid with the highest known antioxidant capacity
Definition
Astaxanthin is a xanthophyll carotenoid of intense red colour produced by the microalga Haematococcus pluvialis, responsible for the colour of wild salmon, flamingos, and krill. Its antioxidant capacity is 6,000 times higher than vitamin C, 800 times that of CoQ10, and 550 times that of vitamin E (by the ORAC method). Unlike other antioxidants, it crosses the blood-brain and blood-retinal barriers, giving it unique neuroprotective and ocular effects.
Detailed explanation
The molecular structure of astaxanthin allows it to insert transversally into the cell membrane lipid bilayer, simultaneously protecting both faces of the membrane from oxidative damage — a unique structural property among carotenoids.
Clinical trials show documented benefits at doses of 4-12 mg/day: reduction of oxidative stress markers (MDA, 8-OHdG), improved insulin sensitivity, reduction of high-sensitivity CRP, improved cardiovascular health, and ocular protection against age-related macular degeneration. Studies in athletes show improved aerobic performance and reduced post-exercise muscle damage.
Oral bioavailability varies greatly and depends on the lipid vehicle: taking it with healthy fats increases absorption 3-4×. Microemulsified liquid formulations have higher bioavailability than powder capsules. It has no documented pro-oxidant effects (unlike beta-carotene at high doses).
Scientific sources
- PubMed — Astaxanthin: a potential therapeutic agent in cardiovascular disease
- PubMed — Astaxanthin: sources, extraction, stability, biological activities and commercial applications
- PubMed — Astaxanthin: a mitochondrial-targeted nutraceutical
- PubMed — Astaxanthin supplementation improves exercise endurance
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