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Formaldehyde (and releasers)

A potent germicidal agent historically used in cosmetics (e.g. nail hardeners) and released in small amounts by some preservatives (like quaternium-15, diazolidinyl urea).

Category/Notes

Preservative, antimicrobial (with safety concern)

Benefits

Prevents microbial growth in products, protecting the user from infections due to contaminated products. However, formaldehyde is a known skin irritant and a suspected carcinogen; even at low levels it can cause allergic reactions. Its benefit is effective preservation, but due to safety concerns its direct use is largely restricted or replaced by safer preservatives.

The Science Behind

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Formaldehyde (and releasers)

June 23, 2025

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