Which relaxer requires mixing two products and is advertised as 'no lye'?

The relaxer that requires mixing two products and is marketed as 'no lye' is guanidine hydroxide. This type of relaxer is specifically formulated to be gentler on the hair and scalp compared to lye-based relaxers. The 'no lye' branding indicates that it does not contain sodium hydroxide, which can be harsher and more alkaline. Guanidine hydroxide is created as a result of combining two components: one is a guanidine base, and the other is a solution that activates the relaxer.

This dual-product system typically allows for a smoother application and a less intense result on the hair and scalp, which is appealing to those who may have sensitivities or who prefer milder chemical processes. As a result, guanidine hydroxide relaxers are a popular choice for clients seeking to straighten their hair without the potential harshness associated with lye relaxers, thereby promoting healthier hair during the relaxing process.