DMDF Hydantoin

Benefits
AntimicrobialAntiseptic
Concerns
Irritant

What is DMDF Hydantoin?

DMDF Hydantoin is a synthetic heterocyclic compound used as a broad-spectrum antimicrobial preservative in cosmetics and personal care products. It slowly releases small amounts of formaldehyde, a potent disinfectant, to inhibit the growth of bacteria, yeast, and mold, thereby extending product shelf life. Commonly found in shampoos, conditioners, lotions, and nail polishes at concentrations up to 0.6%.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 3-10

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Antimicrobial agent
Helps limit growth of bacteria and other microbes on skin or in the formula; may be used for product protection, odor control, or targeted antimicrobial effects.
Preservative
Protects the product from microbial contamination during storage and use, helping maintain safety, stability, and shelf life.