Wrinkles: Retinol or other retinoids

Retinol or other retinoids have a multitude of beneficial effects on wrinkled skin. Two of these are improving collagen levels in the skin, which keeps the skin firmer and protects against wrinkling, and encouraging skin renewal (which produces an exfoliating effect), ushering fresher and tighter layers of skin up from lower down in the skin onto the surface.