More concerning is its release over time from preservatives in products containing DMDM hydantoin, quaternium-15, and urea compounds. When examining product labels, watch for ingredients like ...

Patch testing for allergic contact dermatitis with quaternium-15 alone captured 53% of patients to the formaldehyde group. Adding formaldehyde 1% as a second allergen increased capture rate to 78%.

Approximately half of all patients with formaldehyde sensitivity react to one or more of the formaldehyde-releasing preservatives. A common cross-reaction involves formaldehyde and quaternium-15 ...

The five main formaldehyde releasers — quaternium-15, diazolidinyl urea, DMDM hydantoin, imidazolidinyl urea, and 2-bromo-2-nitropropane-1,3-diol (bronopol) — found in cosmetics and many other ...