TruSkin Vitamin C Serum For Face – Anti Aging Formula with Vitamin C, Hyaluronic Acid, Vitamin E – Brightening Serum – Improve Appearance of Dark Spots, Tone, Fine Lines & WrinklesHow do I know if this product is authentic? To ensure the authenticity of the product, please make sure you are purchasing from the manufacturer: TruSkin. Product authenticity cannot be promised from sellers other than TruSkin TruSkin Naturals. How do I use this product? Perform a patch test 24 hours before regular application to ensure the product is a fit for you. If the formula is compatible, apply 3 5 drops 1 2 times a day to face, undereye area,