Fine lines & wrinkles
Strong evidenceRetinoids are the best-proven treatment for fine lines: over months they increase collagen and smooth the surface. Exfoliating acids (AHAs) and vitamin C help too.
Tretinoin improved sun-aged skin in controlled trials from 1988 on (Weiss 1988). Over the counter, 0.4% retinol improved fine wrinkles in older adults over 24 weeks (Kafi 2007), and 0.05% retinal matched 0.05% tretinoin on wrinkles over 44 weeks (Creidi 1998).