A common question is, when to use vitamin C serum , day or night so you can get the full and complete vitamin c benefits for skin. Dermatologists generally recommend applying vitamin C serum in the morning. Wondering if vitamin C is worth the hype? These 11 benefits of vitamin C serum might convince you to add it to your routine. Not all vitamin C serums are created equal. One of the most effective forms of vitamin C is L-ascorbic acid. Read more to learn the benefits and which serums to buy on any budget. Browse Through a Wide Assortment Of Amazing Skin Care Products. Prime Members Can Enjoy Unlimited Free Shipping, Early Access To Lightning Deals and More.