MASS FACTOR is a whey-and-casein based weight gainer from the well-known sports nutrition experts EAS, makers of MYOPLEX and BETAGEN. Like most weight gainers, it is essentially a beefed-up protein powder. To their blend of fast-absorbing whey and slow-absorbing casein milk protein, EAS has added a significant amount of carbs plus modest amounts of vitamins, minerals and fat. That makes Mass Factor as much a meal replacement powder (MRP) as a weight gainer.

Make no mistake, Mass Factor is formulated to support an increase in muscle mass and body weight so this is not a product for everyone, especially hardcore dieters or those focused on weight loss. Like most weight gainers, part of the reason the nutrient levels are so high (protein approximately 50 grams, carbs approximately 80 grams, almost 600 calories per serving) is that the serving size is so large, 152 grams of powder in this case. 152 grams is about 1/3 lb. of powder! That's 3-4 times the serving size of most proteins or MRPs. But, it's important to point out that users don't have to use a full 4-scoop, 152-gram serving each time. You can use smaller servings sizes as you see fit. If you're trying to pack on some pounds and your plain old protein powder or MRP just isn't cutting it, step up to the EAS Mass Factor and you'll be using one of the very best and most effective products for that purpose.