Boost the Antioxidants e.l.f. Cosmetics, Antioxidant Booster Drops are a vwry lightweight booster to supercharge my beauty products, using only a few drops! These booster drops are super lightweight, absorb into my skin, almost instantly, leaving a refreshing feeling on my skin, every time! According to e.l.f. , "These boosters can be used alone or mixed into your fave moisturizer or foundation for added protection." So, I added 1 to 2 drops into my moisturizer and/or liquid foundations, blending till smooth, then applied to my skin! It seems adding rhe drops actually made the other products apply more smoothly and seemed to last longer! Nourishing, skin loving ingredients that are rich in antioxidants + great for my skin & added to these drops; Vitamin C ~ Antioxidant that helps brightens & rejuvenates Vitamin E ~Antioxidant that helps nourishes & renews Snow Mushroom Extract ~ Anti-inflammatory properties to calm & comfort my skin Impressed by these phenomenal nutrients for keep my skin glowing, protected and healthy! No oily feel either! Beauties, even Rosemary Donahue from Allure featured these drops when they first hit the beauty market! Here's what she posted... "Mixing drops and serums into foundation is an Allure-approved skin-care step and these drops sound like a great addition to any routine.