Muscle Tech Mass-Tech Extreme 2000 is the ultimate 100% whey protein mass gainer. It’s the highest-calorie mass gainer in the field and contains 60g of protein, 400g of carbs, and more than 2,000 calories per serving. The formula also includes 8g of L-leucine, 10g of creatine, and 20 vitamins and minerals. It’s the perfect mass gainer for athletes and bodybuilders who want to build muscle and increase their strength.