Whey protein is a type of protein that is derived from milk. It is a popular supplement for athletes and bodybuilders because it is an excellent source of essential amino acids, including the essential branched-chain amino acids (bcaas). Whey protein can cause sweating because it contains a hormone called catecholamines. Catecholamines are chemicals that are released during physical activity, and they can help to increase your body's sweating response. This response is necessary to cool down your body after you have exercised.