Clients need to precondition the skin prior to a peel treatment but how long should they stop using retinol charisma and their active products for beforehand? 

Retinol should be stopped 3-4 days prior the peel session. The rest of Noon’s products can be used up to the peel session.
It is important to emphasis that in-clinic peel sessions have a stimulating effect on the skin. In order to achieve optimal healing post treatment, we usually  recommend 3-4 days prior to the peeling session to stop using any products that have a dominant prolong or delayed stimulating effect that together with the exposure to the peeling may stress the skin and induce side effects such as redness, burning and flaking. For example, Retinol, Retinoic Acid (prescription), as well as laser treatments. (hair removal and vascular) and other light source treatments. It is important to note that all known possible reactions are not permanent, and the skin will recover quickly, since all NOON peels treatments are superficial peels.