GNC AMP Mass XXX with MyoTOR is a high-quality protein powder designed to support muscle building and workout performance. This mass gainer combines protein, key nutrients, and science-backed innovations like MyoTOR, creatine, and BETAPOWER to deliver proven results. It helps increase lean muscle mass with fewer sets and improves muscle strength in as little as 2 weeks. The product is enhanced for improved strength and stamina, making it ideal for resistance training. It is also certified Banned Substance Tested, ensuring you gain mass without compromising your goals.