Are Protein Supplements Necessary to Build Muscle? The answer is no, you do not need protein powder to build muscle. HOWEVER, If you cannot get the necessary amount of protein you need from food on a consistent daily basis, then yes, you need a protein supplement. The definition of supplement; Noun: “something added to complete a thing, supply a deficiency, or reinforce or extend a whole”. This simply means that sports supplements are there to complete your nutrition, or to…