We recommend 15% if you are new to skin peel. It is a nice introductory kit. 15% is very light acid.

If you are familiar with skin peel, for your 1st uss we recommend 30%.

If you have oily skin or pregnant, 40% is most likely to be OK. If you have thick skin, then 40% is also OK.

The use of 60% acid is NOT recommended unless you are experienced in using 30% or 40%.

You can change your acid level for your product subscription as you will.