This pure L Ascorbic Acid (Vitamin C) powder is specifically formulated for cosmetic use. Its ultra fine, powder-like consistency dissolves instantly in water resulting in luxurious serums that penetrate and absorb into the skin. Bos Essentials Vitamin C Powder can be added to an existing cream or cosmetic product or used to create a unique DIY serum. Basic Instructions:Add between one half and two tablespoons Bos Essentials Vitamin C Powder to four tablespoons water. Mix until dissolved (this should not take more than 2-3 seconds). Apply solution to face, neck and décolletage using a cotton puff.½ tablespoon = approximately a 5% solution1 tablespoon = approximately a 10% solution1 ½ tablespoon = approximately a 15% solution2 tablespoons = approximately a 20% solution*Always start with the smallest percentage possible and spot test for sensitivity. A small amount of baking soda can be added to solution to increase PH if desired. Measurements are approximate only, for exact measurements, a scale should be used.Serum Instructions: Supercharge your DIY Vitamin C Serum by adding Hyaluronic Acid and/or Ferulic AcidIn 4 tablespoons of water, add:Between ½ and 2 tablespoons Bos Essentials Vitamin C Powder (for a 5-20% Vitamin C solution)A few pinches of Bos Essentials Ferulic Acid Powder (optional - helps to stabilize vitamin c and adds additional antioxidant properties)½ teaspoon Bos Essentials Hyaluronic Acid Powder (add only when the rest of the ingredients are fully dissolved)Additional ingredients can be added at the customers discretion. Refrigerate until gelled and apply daily prior to the rest of your beauty routine.