What string or percentage of alpha hydroxy acid is prohibited?

The prohibition of a specific concentration of alpha hydroxy acid, particularly 30%, is grounded in safety regulations and guidelines designed to protect consumers from potential skin irritation and adverse reactions. Alpha hydroxy acids (AHAs) are commonly used in various cosmetic products for their exfoliating properties. However, at higher concentrations, they can lead to increased skin sensitivity, particularly when exposed to sunlight, resulting in complications such as chemical burns or severe irritation.

Regulatory bodies have determined that levels exceeding 30% can pose a significant risk to the average consumer, leading to strict limits on their use in over-the-counter products. Ensuring that products contain alpha hydroxy acids at safe levels helps to maintain skin integrity and prevent harmful side effects, thereby promoting safer use of cosmetic chemicals. This is particularly relevant in the context of professional treatments versus home-use products, where oversight and application methods vary. Thus, the choice of 30% as the threshold indicates the balance between efficacy and safety in product formulation.