Percent Active Ingredient
Within a supplement you can break down all ingredients into two parts, the active ingredients and the inactive ingredients. The active ingredient(s), or active pharmaceutical ingredient(s), are the portion of the supplement that produce chemical change once taken. This means that the active ingredient is the biologically active portion of the supplement. In short it is the part that has pharmacological effects on your body. The inactive ingredients make up all other parts of the supplement; e.g. the coating agents, binding agents, buffers, etc. Both portions of the supplements are important and cannot function without the others.