Preservative

Average
QUATERNIUM-15

Formaldehyde-releasing preservative used in cosmetics. It can aggravate skin, as can all preservatives, although quaternium-15Š—Ès ability to do so is very low if the amount in a product is less than 0.2%.

References for this information:

International Journal of Toxicology, May 2010, supplement 3, pages 98S-114S