Citric acid

Citric acid is a naturally occurring substance that is predominantly found in varying amounts in all types of citrus fruits.
Citric acid is beneficial in that it exfoliates the skin by removing dead cells from the top layer of the skin, thereby promoting new cell growth. Since it is a natural substance, it rarely causes an allergic reaction and is suitable for most skin types.
The valuable cosmetic properties of citric acid include its ability to tighten the enlarged pores of the facial skin. Also citric acid has a pronounced whitening effect, it is used to get rid of freckles, age spots and whiten the skin.