Vitamin C Serum (Topical)

Key points

• L-ascorbic acid at 10–20% concentration is the gold standard — other derivatives (ascorbyl glucoside, MAP) are more stable but less potent
• Stimulates collagen synthesis directly in the dermis — not just an antioxidant, a structural signal
• Brightens by inhibiting tyrosinase — the enzyme required for melanin production
• Highly unstable — oxidises on exposure to air and light; look for air-pump or sealed packaging
• Apply in the morning before SPF — vitamin C boosts sunscreen efficacy and provides independent UV protection