HEMA (hydroxyethyl methacrylate) is a light-curing monomer that is commonly found in gel nail polish formulations. It is used to polymerize the gel polish, which makes the nails become hardened and shiny when exposed to UV/LED light. HEMA is also used in other industries, such as medicine and dentistry. However, HEMA has been identified as a high-level allergen and the main cause of an allergy epidemic in nail coatings. It can cause contact dermatitis, which leads to skin inflammation, itching, redness, and a rash. Some individuals may also experience inflammation or swelling around the nail bed due to HEMA exposure, leading to discomfort and pain.

Manufacturers have developed advanced formulations for HEMA-free gel polishes that offer similar performance to traditional gel polishes. These formulations provide long-lasting wear, high-gloss shine, and easy application, ensuring professionals can achieve excellent results for their clients. Some brands that offer HEMA-free gel polish include AIMEILI, FAZANEST, and Glitterbels. It is important to note that HEMA-free products are not 100% risk-free from allergies or skin irritation, but they do reduce the risk of an allergic reaction.