Skim through

What it does: exfoliant, moisturizer/humectant, buffering, conditioning

The science

As an AHA, lactic acid can gently lift away dead skin cells revealing fresher, smoother, nicer skin underneath, and dissolving product buildup. Because it is a larger molecule, it has difficulty penetrating the skin, meaning that lactic acid is gentler compared to other AHAs.

Benefits for your hair

Promotes hair growth

Lactic acid improves hair health and allows the roots to grow. It doesn’t weigh down the hair. 

Promotes moisturization

It improves the scalp’s natural moisture, which in turn hydrates the hair, making it feel less dry and more bouncy. 

TLDR 

Lactic acid is an amazing exfoliator which is great at promoting hair growth and improving hydration.