Vitamin A  &  Vitamin C Vitamin A Retinoids (a derivative of Vitamin A) are by far the most medically studied ant-aging vitamins.  (Vitamin A) Retin-A and Renova are examples of prescription-grade retinoids believed to work on aging skin by increasing collagen production and decreasing collagen breakdown, according to studies.    In a study published in … Continue reading Top Breakthroughs: Vitamin A & Vitamin C