This is a goopbeauty 20% Vitamin C + Advanced Brightening Serum box. This kit features a two-part design, requiring you to mix 6g of powder with a 23 mL serum activator upon opening to ensure maximum potency. Once mixed, the product yields 30 mL of activated serum. The formula is designed to brighten skin, even out tone, and refine texture using a combination of L-ascorbic acid, ferulic acid, and hyaluronic acid. [1, 2, 3]