L-ascorbic acid is the pure form of vitamin C, one of the most studied antioxidants in cosmetics with efficacy documented by numerous clinical studies.
As an antioxidant, L-ascorbic acid is associated, according to available data, with neutralizing free radicals generated by UV exposure, pollution, and daily oxidative stress. This antioxidant protection helps preserve skin appearance and limit factors contributing to visible signs of aging.
Its role in supporting skin structure mechanisms is documented in scientific literature: L-ascorbic acid is a cofactor of prolyl and lysyl hydroxylase enzymes involved in forming stable and functional collagen fibers. This association is recognized for contributing to the appearance of firmness and visible skin suppleness.
Its action on complexion is also documented: L-ascorbic acid is associated, according to available data, with regulating melanogenesis via tyrosinase and melanin transfer to keratinocytes, for visible reduction of pigmentation irregularities and visible complexion radiance.
Its main limitation in formulation is its sensitivity to oxidation, light, and heat, requiring appropriate packaging (opaque, airless) and recommended morning use with SPF 50 sun protection.
SPF 50 sun protection is recommended the following morning when pure vitamin C is used.
In summary, the reference active for antioxidant and radiance skincare, associated with complementary action on protection, firmness appearance, and visible complexion evenness.
⚠️ Not recommended combination: do not use simultaneously with products containing copper peptides (Copper Tripeptide-1). Vitamin C can oxidize the copper in these peptides, reducing the effectiveness of both actives. If you use both actives, reserve vitamin C for the morning and copper peptides for the evening.
