What retinol percentage should beginners start with?

Beginners should start with the lowest available concentration, typically 0.025% to 0.1%. This allows your skin to build tolerance gradually and minimizes irritation, dryness, and peeling. After 4–8 weeks of consistent use without significant irritation, you can step up to 0.25% and eventually 0.5% or higher. Slow and steady is the key to long-term retinol success.