Beyond its cosmetic use, astaxanthin can also be consumed in the form of capsules or gummies, for example. When taken orally, astaxanthin is believed to have a more comprehensive effect on the body, neutralizing free radicals in tissues and cell membranes. It is also thought to have beneficial effects on the skin: this pigment could improve skin hydration and reduce wrinkles. Dietary supplements containing astaxanthin are also credited with a positive impact on the immune system, athletic performance, and fatigue.
Whether consumed in capsules or gummies, astaxanthin is currently viewed as a versatile ingredient, bridging the gap between nutraceuticals and dermo-nutrition.
Several clinical trials have explored the impact of astaxanthin supplementation on skin quality. The doses generally studied range between 3 and 6 mg per day. This dosage appears to be sufficient for the active ingredient to exert its antioxidant effects, particularly on skin structural alterations related to UV rays. A randomized double-blind placebo-controlled study from Japan, published in 2018, evaluated the effects of a daily supplementation of 4 mg of natural astaxanthin for 10 weeks. The 23 participants, all in good health, then had their skin exposed to UV rays to measure the minimal erythema dose, an indicator of sun sensitivity. The group that received astaxanthin showed an increase in the UV reaction threshold, indicating a better protection against sunburn. In addition, transepidermal water loss in the irradiated areas was significantly reduced, suggesting a better maintenance of skin hydration. Participants also noted a subjective improvement in the roughness and texture of their skin.
Even though astaxanthin can enhance the skin's protection against the sun, it cannot replace a sunscreen.
These findings align with a review of scientific literature published in 2021, which includes several clinical studies, among them six randomized placebo-controlled trials. It highlights a significant improvement in the appearance of wrinkles, skin texture, and hydration levels after a few weeks of supplementation. Astaxanthin could potentially provide support against photoaging of the skin. Furthermore, no adverse effects have been reported to date from oral intake of astaxanthin at dosages between 3 and 6 mg, although it's worth noting that studies are often limited by their modest size.