The 20% Vitamin C + E Ferulic Acid Serum is a potent antioxidant treatment that offers multiple benefits for the skin. Vitamin C helps brighten the complexion, reduce hyperpigmentation, and stimulate collagen production, while vitamin E and ferulic acid provide additional antioxidant protection. However, some users may find this serum to be too strong for their skin, leading to irritation or sensitivity. It is advisable to start with a lower concentration of vitamin C and gradually build up tolerance.