Skincare Active Comparisons: Retinoids, Acids & Formulations

Start with retinol if you're new to retinoids, have sensitive skin, or don't want a prescription. Retinol is 10-20× weaker than tretinoin but causes far less irritation. Move to tretinoin after 3-6 months on retinol if you want faster or stronger results — or if you have acne, since tretinoin is FDA-approved for acne treatment. See our full retinol vs tretinoin comparison.

Choose AHA (glycolic, lactic acid) for surface concerns: dullness, sun damage, fine lines, dry skin. Choose BHA (salicylic acid) for oily and acne-prone skin — it's oil-soluble, so it penetrates into pores to clear blackheads and whiteheads. Combination skin can alternate both, but don't layer them on the same night. See our AHA vs BHA comparison.

Yes — the old "they cancel each other out" claim is a myth based on outdated lab studies using pure niacin (not niacinamide). Modern formulations layer fine. For best tolerance, apply vitamin C in the morning (antioxidant + SPF synergy) and niacinamide at night or vice versa, but same-routine use is safe and effective. This contradicts some older skincare content — the updated consensus is documented in our articles.

Bakuchiol shows retinol-like benefits in some studies (mild improvement in fine lines, pigmentation) with much less irritation. It's roughly as effective as low-concentration retinol (0.25%) but nowhere near the potency of tretinoin or even 1% retinol. Choose bakuchiol if you're pregnant, breastfeeding, or have very sensitive skin that can't tolerate retinol. See our bakuchiol vs retinol comparison.