The Prep Solution is a light glycolic acid solution that mildly removes traces of lipids in preparartion for professional strength chemical peels and exfoliators.  
 
Product Ingredients: Aqua (Purified Water), Chamomilla Recutita (Matricaria) Flower Extract, Calendula Officinalis Flower Extract, Symphytum Officinale (Comfrey) Extract, Camellia Sinensis Leaf Extract, Steareth-20, Glycolic Acid, Salicylic Acid, Hydroxyethylcellulose, 1,2-Hexanediol (and) Caprylyl Glycol.
pH 3.5 - 4.0