These ingredients can be used simultaneously. They target different things. While Retin-A helps to shed the superficial skin layers and stimulate collagen growth, kojic acid helps to lighten the skin and smooth out pigment irregularities. The Vitamin C also stimulates some collagen growth but...
Having performed bench research with retinoids including all-trans retinoic acid (Retin-A), I can tell you that retinoids have wonderful effects on the health and therefore the beauty of the skin. They increase fibroblasts' production of collagen, especially type 1, elastin, and other...
Great question. Your photo definitely shows a loss of buccal fat.It does get smaller as we age - but it seems for you, it happened suddenly.There are no studies showing that Retin-A causes loss of facial fat loss in humans but...But there are some fascinating studies on how vitamin A regulates...