Tartaric Acid is an Alpha-hydroxy Acid (AHA) found naturally in many plants and fruits, including grapes. It's often added to Glycolic or Lactic Acid products to strengthen their exfoliating effects, but its primary benefit is its ability to regulate a formula's pH level. If the pH level swings too high or too low in a product, the result is skin irritation - Tartaric Acid can help keep things stable.
