Ingredients

What your skin actually needs — and why. Ceramides. Niacinamide. Retinol. Peptides. The ingredient lists on skincare products have never been longer, and the marketing claims have never been louder. This section cuts through both. Each guide here explains what an ingredient does, what the clinical evidence actually shows, and whether it belongs in your routine right now. Because reading a label and knowing what you are buying should not require a biochemistry degree.

All Guides Reviews Routines Ingredients Data

Vitamin C serum bottles on marble surface with warm editorial lighting

Ingredients

Vitamin C Serum Guide: Why Yours Is Probably Already Expired | Glow Protocol

Ingredients / Carolina Menezes

Vitamin C is one of the most important ingredients in a post-30 skincare routine. It is well-evidenced for brightening hyperpigmentation, supporting collagen synthesis, providing antioxidant protection against UV and pollution damage, and, when formulated correctly, delivering visible improvements in skin tone and texture within 8 to 12 weeks.