Top Vitamin C Serums for Bright Skin
Forms of Vitamin C
- L-ascorbic acid: Most potent, requires low pH, oxidizes quickly.
- Sodium ascorbyl phosphate: Stable, gentle, for sensitive skin.
- Tetrahexyldecyl ascorbate: Oil-soluble, penetrates deeper.
- Ascorbyl glucoside: Stable, converts to L-ascorbic acid on skin.
What Makes a Good Serum
10-20% concentration, pH below 3.5, opaque packaging, combined with vitamin E and ferulic acid for 8x stability boost.
Signs of Oxidation
Clear or pale yellow = fresh. Dark yellow, orange, or brown = oxidized and ineffective.
Application Tips
Apply in the morning before sunscreen. Store in a cool, dark place. Refrigeration extends shelf life.
