Glycolic Bright Instant Glowing Face Serum, which has the ideal concentration of 1% glycolic acid, helps to brighten the skin and decrease dark spots by 57%. Dermatologist-tested and shown effective on Asian skin tones. Glycolic acid, 1.0%, in the formulation. Instantly brightens skin and lightens dark spots, according to clinical research. dermatologists tested the product on Asian skin. Immediately: Skin is bright and luminous. Dark spots are lessened and flaws are visibly lessened after two weeks. Skin is more even and seems more vibrant.