The Ordinary Amino Acids + B5 is an ultra-lightweight serum that combines a concentrated 17% solution of amino acids with 5% pro-vitamin B5 to support skin's natural hydration barrier. This water-based formula provides comprehensive moisturization without feeling greasy or heavy on the skin. This serum is designed to mimic the skin's natural moisturizing factors through its blend of amino acids and derivatives. The formula works at both surface and deeper levels to hydrate and protect the skin barrier. For best results, apply a few drops to face morning and evening before other creams. Some users may experience a mild tingling sensation upon application, which is normal. If sensitivity occurs, the serum can be mixed with other skincare products to reduce its strength.