Tromethamine

Irritancy: unknownComedogenicity: unknownBuffering

The details

Tromethamine (aka THAM) is a synthetic amino acid that shows up in skincare as a helper ingredient. It functions as a pH adjuster to help neutralize acidic ingredients and set a formula's pH to the right spot. This matters a lot because a lot of actives (like vitamin C) needs a specific pH to work well and feel comfortable on skin. Concentration use ranges from 0.1-1.0% depending on the formula.