Check out our latest video on the Elite Physique YouTube Channel! Mutant Mass Bars – a tasty way to get in approximately 1150 cals of Mutant Gainz! This is a simple recipe that packs in the calorically dense ingredients with a Mutant Mass powder foundation. Mutant Mass is Canada’s #1 weight gainer…and for good reason. Their formula is second to none and contains such clean carbs as barley, sweet potato and oats. Gone are the days of cheap sugar carbs. Mutant has spared no expense in this revised formula and it can be purchased directly from SupplementSource.ca.