Monochloroacetic acid (MCA)
Monochloroacetic acid (MCA, also called chloroacetic acid or MCAA) is used in some professional peel formulations. It is different from trichloroacetic acid, mandelic acid and the general term monocarboxylic acid.
Where the name appears
Manufacturers list MCA in certain professional peel formulas, sometimes combined with other acids. That establishes ingredient identity; it does not independently confirm every claimed aesthetic benefit.
Evidence must match the purpose
A randomized study of MCA concerned common and plantar warts. Those findings cannot establish facial-rejuvenation results. Ask for evidence and instructions for the exact professional peel being proposed.
A distinct chemical hazard
Chemical-safety guidance describes MCA as corrosive and potentially systemically toxic after exposure. Finished formulations and professional use need their own assessment. Do not treat an MCA product as interchangeable with a TCA peel or attempt a home protocol.
Read the original sources
Sources describe specific products, studies or countries. They do not establish approval everywhere.
General education. Your clinician can assess your individual suitability. Rules depend on the treatment country; FDA references concern the United States. External sources may be in another language.