Citric Acid is an Alpha Hydroxy Acid, a weak organic acid, which can rejuvenate skin to become more youthful and healthy. It has astringent and exfoliating properties. Citric Acid is great for brightening skin, shrinking pores, treating acne, and clear dark spots and fine lines. The effect of this beauty ingredient can be felt in masks, scrubs, toners, or peels. A very effective natural preservative.