Multi-acid complexes are typically made of alpha hydroxy and beta hydroxy exfoliating acids–such as glycolic acid, salicylic acid, phytic acid, and mandelic acid–that work synergistically together to increase cell turnover. These acids can significantly improve brightness, smoothness, and reduce visible signs of aging by removing dead skin cells, unclogging pores, improving skin texture, and reducing the appearance of blemishes, hyperpigmentation, and fine lines.