What should I know about vitamin c fur die haut?

Vitamin C is a key antioxidant that supports collagen synthesis and protects skin from UV-induced damage. Applied topically (e.g., L-ascorbic acid 10–20 %), it can improve skin texture, reduce hyperpigmentation, and enhance photoprotection. Oral intake benefits skin mainly if you are deficient; in well-nourished individuals, high doses (≥1 g/day) offer no added skin benefit and may cause gastrointestinal upset or kidney stones in predisposed persons. Evidence for topical vitamin C is moderate (several RCTs), while oral supplementation for skin improvement without deficiency is weak. MyBody-X tests do not routinely measure vitamin C in blood; deficiency is assessed via diet or clinical signs. Note: vitamin C is unstable – choose stable formulations (anhydrous serums, dark glass) for efficacy.