Astaxanthin

INCI: Astaxanthin 
Category: Ketocarotenoid / High-Potency Antioxidant / Anti-Ageing Active
Used in: Antioxidant serums, anti-ageing moisturisers, supplements (oral) Typical Usage Level (Topical): 0.1–0.5% | Oral: 4–12mg/day

What This Ingredient Does

Astaxanthin is a naturally occurring pigment, the same compound that turns salmon and flamingos pink, produced by a microalgae called Haematococcus pluvialis when it is under environmental stress. It is essentially the algae's own survival shield, and that protective power translates directly to skin.

What makes astaxanthin stand out is how it works. Most antioxidants neutralise a free radical and get used up. Astaxanthin positions itself across the entire cell membrane, protecting both the inside and outside of the cell wall simultaneously, and keeps working without being consumed in the process. This makes it one of the most sustained antioxidants studied, with strong performance across multiple antioxidant measures.

It also actively reduces the inflammation triggered by UV exposure, the kind that quietly accelerates skin ageing over years without being immediately visible.

Topically, it protects skin cells from oxidative damage, improves elasticity, and supports a smoother, firmer skin surface over time.

Orally, it accumulates in skin tissue from the inside, reducing UV-induced damage, calming inflammation, and improving hydration and elasticity through a systemic route. Very few antioxidants have strong clinical evidence for both topical and oral use; astaxanthin is one of them.

Pairs well with Vitamin E and Ferulic Acid topically for a layered antioxidant approach.

Key Benefits

• One of the most potent naturally occurring antioxidants, with strong protective activity against UV and environmental damage

• Protects skin cells from both inside and outside simultaneously, a mechanism most antioxidants cannot replicate

• Reduces UV-triggered inflammation that drives premature skin ageing over time

• Improves skin elasticity, reduces wrinkle depth, and supports moisture retention with consistent use

• Clinically effective both topically and orally, one of the few antioxidants with dual-route evidence

Who It's Best For

• Those with significant UV exposure history, photoageing, or environmental skin damage

• Adults 30+ looking to strengthen their antioxidant and anti-ageing routine

• Those supplementing for skin health, oral astaxanthin has a growing evidence base for skin outcomes including elasticity and hydration

• Suitable for all skin types including sensitive skin, no known irritation at cosmetic concentrations

Clinical Note by Dr. Su

Astaxanthin is a well-evidenced antioxidant with a genuinely useful mechanism for skin protection, both topically and as a supplement. For oral use, 4–6mg daily is where most of the clinical data sits, and it works well alongside other antioxidant supplements as part of a broader skin health routine. It does not replace SPF, and it works best as part of a complete approach rather than a standalone solution.

References

• Tominaga K, et al. (2012). Cosmetic benefits of astaxanthin on human subjects. Acta Biochimica Polonica. PMID: 22428137

• Davinelli S, et al. (2018). Astaxanthin in skin health, repair, and disease: a comprehensive review. Nutrients. PMC5946307