Our nicotinamide serum contains glycerin, nicotinamide. It can penetrate into the dermis and really work from the inside and it's much better. The way to use it is very simple: 1. Wash and dry your face. 2. Apply 2-4 drops of serum to face and massage in circular motions on both sides of cheeks for 3-5 minutes until absorbed. 3. Combine with other lotions and creams to enhance moisture retention. And the essence contains smaller molecules than the water lotion, which is more easily absorbed by our skin to achieve the effect of beauty.