We use Vitamin A (Retinol) in our Anti-wrinkle/firming serum, and A-Retinol + Peel.  Vitamin A (Retinol) - Topical Vitamin A has been suggested to help build collagen fibers within the skin in addition to its more superficial exfoliating property. This is the basis for its use in minimizing the appearance of fine wrinkle lines. Vitamin A or Retinol is the main ingredient found in TYK Young Again, M.D. Forte, DDF and SkinScience products.