Vitamin C Ascorbic Acid (Vitamin C)
Vitamin C (ascorbic acid) is a water-soluble antioxidant essential to humans, regarded in cosmetics as the gold standard of brightening and anti-aging protection. It performs multiple functions: it strongly neutralizes free radicals, is an essential cofactor in collagen synthesis, inhibits melanin production in melanocytes and strengthens the action of UV filters. It has been clinically proven that, used regularly, it reduces wrinkles, evens out skin tone, brightens hyperpigmentation and restores a youthful glow to the complexion. The most effective forms are L-ascorbic acid (the strongest but unstable) and stable derivatives: Ascorbyl Glucoside, tetrahexyldecyl ascorbate (THD) and magnesium ascorbyl phosphate. Ideal in the care of all skin types, especially dull, tired skin with photoaging and hyperpigmentation — best applied in the morning before an SPF cream.
Radiance10-15% L-ascorbic acid over 12 weeks: 16% increase in collagen, 26% reduction in wrinkles, 30% brightening of hyperpigmentation (Humbert et al., 2003, n=20).
A cofactor of the enzymes that hydroxylate proline and lysine in collagen synthesis (without vitamin C, collagen synthesis stops). It inhibits tyrosinase. Synergy with vitamin E and ferulic acid.








