What is the impact of DMDM Hydantoin on humans?

• A. It is a vitamin supplement for hair growth.
• B. It can irritate the eyes and scalp and is an allergen that may cause hair loss.
• C. It is completely inert in humans.
• D. It causes immediate liver failure in any exposure.

Answer: (B)

DMDM Hydantoin is a preservative used in cosmetics and hair products that slowly releases small amounts of formaldehyde. This makes it more likely to cause local irritation and can act as a sensitizer. In people who become allergic, exposure can lead to allergic contact dermatitis on the scalp, presenting as redness, itching, and inflammation. Scratching and irritation in the scalp can contribute to hair shedding or perceived hair loss in some cases. It is not a vitamin, it is not inert, and it does not cause immediate liver failure with typical exposures. The key idea is recognizing its potential for local irritation and allergic reactions rather than systemic toxicity.