Hyaluronic acid might be one of the most popular ingredients in skincare and with good reason. It's a humectant, which means it draws in water, making it one of the key components of hydrating ...

However, L-ascorbic acid is by far the “purest and most potent form of the antioxidant,” says Dr. Deanne Mraz, a board-certified dermatologist and the president and co-founder of Modern ...