The truth about pepper spray strength labeling:The percentage of oleoresin capsicum "OC" varies between brands and lines of pepper sprays. But the fact is that the concentration that the manufacturers advertise is relative to ALL THE OTHER INGREDIENTS in the can. These other ingredients include the carrier for the OC, a propellant, and often marking dyes or other chemicals. An over-the-counter "10%" spray contains 10% Oleoresin Capsicum relative to the rest of the ingredients. What the OC concentration does not measure is the concentration of the active ingredients (Capsaicin) in the OC formulation. OC concentration therefore, only represents the amount of OC (oily resin) in a canister and not its strength. The heat or strength of OC is measured by the quantity of an active ingredient called Capsaicin*. Therefore, the higher the Capsaicin amount, the hotter the OC. Smart Life Store sells only name brand, tested and dependable pepper sprays.