I absolutely love this product. I love the SkinCeuticals brand in general because they have the research to back up their claims. There is no hocus-pocus here. I use this product pretty regularly - in the am, pm, or both. It has the highest concentration of niacinamide on the market (5%), which strengthens and repairs the skin’s moisture barrier, corrects blotchiness/ hyperpigmentation and helps correct early signs of aging. It also has a ton of glycerin so it is ridiculously hydrating without being greasy at all. The texture is divine too, transforming from a silky emulsion to a smooth serum upon contact with your skin. This is a no brainer in my book. I LOVE this stuff and highly recommend. It also lasts forever, which helps offset the price point.