You don't need a concentration of more than 10%, because then you would simply be achieving an indirect peeling strength that is more easily offered through lower percentages of glycolic acid.

Apply once per day, ideally in the PM. Can be diluted with other treatments to reduce strength until skin develops tolerance. Avoid contact with eyes. If irritation persists, discontinue use and consult a physician. Use only as directed. Contact of the product with the skin must be of limited frequency or duration.

If irritation occurs, cease use and consult a physician. Use only as directed on unbroken skin. Patch testing prior to use is advised.