Brand new. Never opened or used. 10 % lactic acid solution. Brighten It 10% Lactic Acid Solution uses Alpha Hydroxy Acid (derived from milk), to mildly exfoliate and improve skin tone and texture. This formula gently removes dark spots and discoloration and works effectively to improve uneven skin tones for all skin types and colors. Recommended For: All skin types. Excellent for discolored, dull or rough textured skin.