This is a staple in my skincare regimen, a holy grail product, if you will. Ingredient wise it’s similar, if not identical, to Skinceuticals vitamin c serum. The 20% was a little too much for my skin, but the 10% formulation is amazing. IMO, any good skincare routine should have some type of vitamin A (retinol), vitamin C, and a sunscreen no less than SPF 30. If you’re wanting to incorporate a vitamin C and don’t want to pay an arm and a leg, I highly recommend this product.