Iodopropynyl Butylcarbamate
Explained
Iodopropynyl Butylcarbamate (IPBC) is a preservative that is especially good at getting fungi and mold out of your cosmetics.
IPBC works by leveraging the antimicrobial properties of its iodine containing structure. Iodine has been used as a germicide since the late 1800s and IPBC is a more refined and stable derivative of it.
It is typically used at very low levels in cosmetics, with most formulations using 0.0125% or less (well below its approved maximum).
In the EU, IPBC concentration limits are set at 0.02% in rinse-off products and 0.01% in leave-on products.
Though IPBC is a relatively uncommon contact allergen, patch testing studies show positive reaction rates ranging from 0.3%-0.9% of patients tested. This is still quite low compared to preservatives like methylisothiazolinone which sits at around 4-5%.
Researchers note that existing iodine sensitives or rubber allergies may be the cause of this as IPBC shares a structure with both thiuram (used in rubber) and iodine.
Be sure to patch test if you are unsure and speak with a medical professional about using this ingredient.
See all 1,066 products with Iodopropynyl Butylcarbamate
