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These are primarily preservatives commonly found in cosmetics, baby bath soap, nail polish, eyelash adhesive and hair dyes. Look for: DMDM hydantoin, diazolidinyl urea, imidazolidinyl urea, methenamine, quaternium-15, and sodium hydroxymethylglycinate. These ingredients slowly and continuously release small amounts of formaldehyde that cause toxicity and skin irritation.

Formaldehyde - Naturally Serious Skin Care Bad Ingredient Glossary

Why It’s Commonly Used: Preservative
Why We’ll Seriously Never Use It: Irritant, carcinogen, toxicity