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Straight answers on hyaluronic acid, vitamin C and retinol: what each one does, when to use it and what to use it with.

11 November 2026 · 7 min read
How to use vitamin C serum: dry skin or wet fingertips?
Most advice says to put vitamin C serum on dry skin, and for water-based serums that's right. A water-free serum like 04 BRIGHTEN Vitamin C Serum 20% still goes on dry skin, but you massage it in with wet fingertips. Here's the full morning routine, how much to use, how often, and what to keep for the evening.