Which agent is used in the formulation of nail strengtheners?

Formaldehyde is a common ingredient found in many nail strengtheners because of its ability to strengthen and harden the protein structure of the nails. It works by creating cross-links in the keratin, a key protein in nails, making them less prone to breakage and damage. This hardening property makes formaldehyde a popular choice for formulations intended to improve nail health and resilience.

Although acetone is often associated with nail polish removers and can be drying to the nails, it does not provide strengthening benefits. Silicone can help give nails a smoother appearance but does not strengthen them. Glycerol, or glycerin, is mainly used as a humectant to retain moisture, which does not contribute to strengthening; instead, it focuses on hydration. Thus, formaldehyde stands out as the effective agent in nail strengtheners due to its specific and desirable chemical properties that enhance the structural integrity of nails.