Astaxanthin is the carotenoid that gives salmon its pink colour, flamingos their flamingo-ness, and shrimp their shrimp-ness. It's also one of the most studied antioxidants in modern nutrition science — and one of the few that meaningfully crosses into skin tissue.
What makes astaxanthin different from other antioxidants?
Standard antioxidants (vitamin C, vitamin E, glutathione) each handle specific kinds of oxidative damage. Astaxanthin's molecular structure lets it do something most can't: it can sit at both the inner and outer membranes of cells simultaneously, neutralising free radicals on both sides at once.
In ORAC (oxygen radical absorbance capacity) testing, astaxanthin scores:
- ~6,000× stronger than vitamin C at single-oxygen quenching
- ~550× stronger than vitamin E
- ~10× stronger than beta-carotene
(ORAC is one of several oxidative-capacity measures, not the only one — but the magnitude of the difference holds across measurement methods.)
Where astaxanthin actually goes in your body
Most antioxidants get filtered out by the gut and liver. Astaxanthin, because it's fat-soluble, transports through the bloodstream bound to lipoproteins and reaches:
- Skin tissue — protects against UV-induced oxidation (photoaging)
- Eyes — crosses the blood-retinal barrier to support macular health
- Brain — crosses the blood-brain barrier (rare for an antioxidant)
- Muscle — supports recovery from oxidative stress during exercise
What the skin research shows
Several human studies on oral astaxanthin supplementation (typically 4-6 mg daily) have shown:
- Reduced UV-induced skin damage at 8-12 weeks
- Improved skin elasticity
- Reduced appearance of fine lines around the eyes
- Better skin hydration
It's not a substitute for sunscreen, but it works at a different layer — protecting the skin from the inside while sunscreen blocks UV from the outside.
Where to find it
Astaxanthin in supplements is almost always derived from Haematococcus pluvialis, a freshwater algae that produces astaxanthin as a survival mechanism when stressed. Salmon get their pink colour from eating this algae through the food chain.
NTX products containing astaxanthin include Vida Glow Radiance+ (combines astaxanthin with hyaluronic acid for skin glow) and several SRW longevity formulations.
Frequently asked questions
Will astaxanthin turn my skin pink? No. The dose required for that would be far beyond supplementation levels.
Pink urine — should I be worried? Astaxanthin can give urine a slight pinkish tinge in high-dose supplementation. It's harmless and indicates the body is processing it.
Best time to take? Morning with a meal containing fat (it's fat-soluble — needs dietary fat to absorb).
Does it interact with medications? Generally well-tolerated, but if you're on blood-thinning medication, mention it to your doctor — astaxanthin has mild blood-thinning properties.