Transderma Vitamin ATransderma Vitamin A Professional Retinol Serum, 30 ml Transderma Vitamin A is a professional grade retinol (Vitamin A) serum from Transderma, a Japanese brand developed for clinical and aesthetic use. Retinol is one of the most well studied active ingredients in skincare, with decades of research supporting its efficacy for accelerating skin cell turnover, reducing the appearance of fine lines and wrinkles, evening skin tone, and improving overall