What common ingredient in nail polish can cause allergic reactions?

Formaldehyde is a common ingredient in many nail polishes, primarily used as a hardening agent and to improve the durability of the polish. It is known for its effectiveness in enhancing the performance of nail care products; however, it is also recognized for its potential to cause allergic reactions in some individuals. These reactions can manifest as contact dermatitis, which may lead to symptoms such as redness, itching, or swelling around the nails or skin where the product was applied.

While acetone is often used as a solvent in nail polish removers and can be irritating to the skin, it is not typically linked to allergies in the same way that formaldehyde is. Alcohol is also more commonly associated with drying properties and does not usually cause allergic responses. Vegetable oil is generally considered safe and is sometimes included in formulations for its moisturizing properties, but it does not pose the same risks for allergic reactions. This distinction makes formaldehyde the notable ingredient associated with allergic potential in nail products.