EU and UK(new) registered product. Why is it unique? 15% Glow Serum is made with Ethyl Ascorbic Acid the most potent(90% is pure vitamin C) and stable derivative. The addition of ethyl molecule (oil loving) enhances skin penetration and allows it to work at pH 4.7 (same as skin) so it will not cause redness or disrupt the natural acid mantle. (pure Vitamin C works at ph 3.6 , one thousand time more acidic than skin) What does it do. The antioxidants counteract the free-radical damage known to cause fine lines, dullness, discoloration lines and reduces appearance of age spots. This serum is preserved using sodium levulinate (extracted from wood) and sodium anisate (extracted from star anise spice) . They are the only preservatives that are 100% natural and good for skin . Please use the bottle within 5 months after opening. How to use it. Apply 2-4 drops to the face and neck area and massage gently (your skin might need slightly less/more). Use up to 2 times a day.