As with all Elemental Nutrition products the potency of ingredients used in Anabolic Mass are the strongest available. Thus please refrain from using in particular a separate testosterone booster whilst taking Anabolic Mass. Most users shall find the naturally elevated testosterone levels achieved from using Anabolic Mass are profound. In some cases, side effects may even be experienced including oily skin or acne. Most hardcore users consider this a positive side effect of a testosterone boosting supplement meaning "the product is working". However if you're prone to acne and this effect concerns you, we'd recommend trying an alternative brand non-anabolic mass gainer.