How Do You Figure Out The Concentration Of An Ingredient In A Cosmetic Product?
Truth bomb: just because a serum has vitamin C, it doesn’t mean it’ll help you keep wrinkles away. (By the way, you can substitute vitamin C with any other ingredient). It’s not just what’s in a serum that matters. The concentration of an ingredient, too. If you add 15% vitamin C to an anti-aging serum, you’ve […]



