[DESCRIPTION] The ultimate pure Vitamin C serum is here! HSGN, the brand that gave us the best Korean dupe of SkinCeuticals' Vitamin C, now brings us the ultimate version with concentrated, unrivalled benefits. HSGN Pure 20% Vitamin C E Ferulic Acid Ampoule contains concentrated 20% L-Ascorbic Acid (Vitamin C) that adds reliable yet intense antioxidant benefits to the skin. It also contains Ethyl Ascorbic Acid, a stable form of Ascorbic Acid that is often praised as the most efficient and effective for Vitamin C. This one bottle of ampoule improves all signs of aging. Targeted benefits include improvements for: The Ferulic Acid in the formula maximizes the antioxidant and antibacterial benefits of Vitamin C, while Tocopherol (Vitamin E) neutralizes free radicals and replenishes skin lipids. This is a sensitive skin-approved Vitamin C serum that all skin types can benefit from. HSGN Pure 20% Vitamin C E Ferulic Acid Ampoule boasts an innovative formulation that meets the top 6 Vitamin C formula standards. This is the optimal morning and night Vitamin C serum for fast and reliable results for intermediate to advanced Ascorbic Acid users. If you love the SkinCeuticals CE Ferulic or the classic HSGN Pure 15% Vitamin C E Ferulic Acid Serum, try this Vitamin C Ampoule for more concentrated benefits that will give you faster results. When used daily or every other day, this bottle can be used for 4-8 weeks. [HOW TO USE]In the morning, after cleansing and toning, apply 3-5 drops to a dry face and neck. Follow up with a moisturizer and sunscreen. Or, mix 2-3 drops with moisturizer for a nighttime skincare routine.Patch testing prior to regular use for skin sensitivity checks is highly recommended. After opening, be sure to always close the lid tightly, and store the product in the fridge or at a cool room temperature away from direct sunlight to prevent oxidation.Use the entire bottle within 8 weeks for the best results with the highest potency.Each person may have different effects.※ All purchased items from our listings will be shipped from South Korea.