- 'Skin brightness improvement test' completed. - Filled with 10% of these highly concentrated active vitamin ingredients. 'Ascorbyl glucoside' has simillar efficacy of vitamin C, but much safer. Vitamin C is highly acidic, so there is a concern that it may cause skin irritation. However, 'Ascorbyl Glucoside' is EWG Grade 1, so it is not only safe enough, but also the effecacy is as same as vitamin C.
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