Which chemical was outlawed by the FDA in acrylic nail products?

Methyl Methacrylate (MMA) has been outlawed by the FDA for use in acrylic nail products due to its potential health risks and safety concerns. MMA is a strong monomer that can lead to severe allergic reactions and other harmful effects, such as skin irritation and respiratory issues. Additionally, MMA can cause the nails to become more prone to lifting and can lead to damage to the natural nail. This substance has been deemed unsafe for cosmetic use, which is why regulatory bodies like the FDA have prohibited its use in nail products.

In contrast, substances like Ethyl Methacrylate are still allowed in the formulation of acrylic nails, as they are considered to be safer alternatives that offer sufficient adhesion and durability without the same level of associated risks. Benzoyl Peroxide, primarily an initiator used in polymerization processes, is also not banned, nor is formaldehyde, which, while it has its own set of concerns, remains permitted under specific regulations in some contexts. Hence, the identification of MMA as illegal for use in acrylic nail formulations is grounded in its recognized dangers to consumer health.