very easy i put what is left on the backs of [SEP] cosmetics c booster vit c serum w hyaluronic acid vit e this products says it helps with hydration elasticity suppleness it is true that is exactly what it does i use this serum morning night on clean skin you just need a thin layer i use it on my neck also then just as the directions state add your moisturizer very easy i put what is left on the backs of my hands i am trying to get into the practice of using the same products on my face then on my elbows backs of hands it really makes a difference i like the look of the bottle the thin jelly like serum i have had other vitamin c serums i like the best it makes my skin look hydrated feeds my wrinkles some nutrients hard to describe not a year difference but i am i still look like me just healthier i did receive my serum at a reduced price for an honest opinion it is great thank you