Keep in mind that how you utilise the product is just as crucial as how it works. Using a vitamin C serum on a regular basis (ideally in the mornings!) and properly storing it to preserve its potency can yield noticeable skin improvements—but not overnight. Even the most effective products can take weeks or months to show results. Check out some of the best vitamin C serums from stores like Dermstore, Sephora, Ulta, Amazon, and more in the list below. How can you know which products are best for your skin? 1. Biossance Squalane + Vitamin C Rose Oil Biossance has a best-selling rose oil that is great for dry or older skin. It has an eyedropper tip for mess-free application and contains lipid-soluble vitamin C to brighten while hydrating. 2. BeautyBio The Daily Brightening Vitamin C Serum This lightweight, fragrance-free serum, which contains magnesium ascorbyl phosphate, a water-soluble form of vitamin C, is recommended for oily and mixed skin types. The formula of this serum is also gr...