The products available at Evolutions are pharmaceutical grade and have a high percentage of active ingredients. Products made for mass marketing like those you get in drug stores (or even high-end department stores) often have high amounts of fillers and preservatives to counter bacterial growth and prolong “shelf life.” They also tend to have lower quantities of active ingredients. Because there has been no professional evaluation/recommendation before or after the product has been purchased, it is in the manufacturer’s interest to “water down” the products to minimize any potential adverse reactions (which in turn limits the benefits).