Should Niacinamide and L-Ascorbic Acid Be Used Together?

Expert Advice, Q&A, Skin Care Advice

  These days, while it’s (more) common knowledge that acidic compounds like hydroxy acids should not be used with retinol, the interaction between two other prominent and well-studied compounds: niacinamide and L-ascorbic acid, is rarely discussed. Ironically, along with hydroxy acids and retinoids, these two compounds to a great extent constitute and represent four of Read more »