The cosmetics industry in the United States is a multi-billion dollar industry that includes a wide range of personal care products such as makeup, skincare, hair care, and fragrances.
Here is a sample formulation for a 20% vitamin C face serum with ingredient quantities listed: Ingredients: 14 mL water 4 mL glycerin 2 mL L-ascorbic acid (vitamin C) 0.6 mL propylene glycol 0.4 mL hyaluronic...