Tretinoin (Retin-A)

A prescription-strength topical retinoid approach for improving skin texture and aging signs, typically using tretinoin rather than over-the-counter retinol. It works by speeding skin-cell turnover and supporting collagen and new skin formation, which can help smooth acne, fine lines, and overall skin renewal. Dermatologists note it may be started as early as the 20s when appropriate, but it should be avoided during pregnancy or breastfeeding.