Also known is Retinol palmitate, it plays an important role in cell growth, vision health, and immunity. Topical preparations like Retinol or Tretinoin (see CYRx MD Skincare), help treat acne, improve skin turnover, increase collagen production, decrease wrinkles and improve overall skin health. It has been used to treat measles, cataracts, HIV, leukemia and dry eyes. Retinol comes from animal products such as milk, liver and eggs.