Raw Nutrition | Bum Mass | 20 Servings

Raw Nutrition Bum Mass Gainer is a true high-calorie mass gainer designed around one primary objective: make it easier to sustain the caloric surplus required for muscular bodyweight gain. At 1,070 calories per 4-scoop serving with 196g carbohydrates and 53g protein, this formula is not pretending to be a lean meal replacement or a low-carb protein powder. It is built for lifters whose training output is high enough that food volume, appetite fatigue, and schedule friction can interfere with growth. The formulation strategy is straightforward and effective: combine a large carbohydrate base for calorie density and glycogen support, a dairy protein matrix for muscle protein synthesis and sustained amino acid delivery, then add a small but useful layer of recovery and strength support with glutamine and creatine.

The carbohydrate system matters here. Rather than relying on a single cheap source alone, the formula uses a blend of maltodextrin, Carb10® pea starch, sweet potato starch, oat flour, and quinoa powder. The practical benefit is a shake that delivers large calories efficiently while feeling more like a mixed carb feeding than pure sugar powder. For the user, that means easier post-workout refueling, fuller muscles as glycogen stores replenish, and a more realistic path to hitting aggressive daily calorie targets.

The protein blend delivers 53g from whey protein concentrate, whey isolate, and micellar casein. That combination gives both faster and slower digestion kinetics: whey rapidly elevates circulating amino acids, while micellar casein extends amino acid availability over time. In a mass-gain context, that’s useful because the goal is not just a quick protein hit, but better total daily protein coverage and meal replacement utility.

L-Glutamine is included at 2.5g. The evidence base for glutamine in healthy resistance-trained athletes is limited compared with more established sports nutrition ingredients, so it should not be viewed as the main reason to buy the product. That said, 2.5g can still serve as a recovery-oriented inclusion within a high-calorie post-training formula, especially for athletes who train hard and want extra amino support layered into their shake.

Creatine monohydrate is included at 2.5g, and this is the one active where dose context matters. Creatine is one of the most validated performance ingredients in sports nutrition, with 3-5g daily generally used as the evidence-based maintenance range after saturation. At 2.5g, this formula contributes meaningfully to daily creatine intake, but it sits below the standard standalone maintenance dose. In practical terms, it supports a mass-gain stack well, but many users will still benefit from adding extra creatine to reach the full researched range.

Mineral support is modest but useful. Calcium at 312mg contributes to bone and muscle function. Potassium at 454mg supports fluid balance, neuromuscular function, and intracellular electrolyte status—especially relevant when carbohydrate intake rises and training volume is high. Iron is present at 1mg, but not at a therapeutically meaningful level for deficiency correction.

The synergy is simple and effective: carbohydrates replenish glycogen and elevate energy availability, protein supplies amino acids for muscle repair and growth, creatine supports phosphocreatine stores for repeated high-output effort, and potassium/calcium support muscular function in the background. Importantly, this is a fully disclosed label with no proprietary blends hiding active doses. That is a real advantage in the mass gainer category, where many formulas still obscure what you are actually getting.

Day 1, expect a large calorie hit, strong post-workout fullness, and a much easier time pushing total intake upward. Over 2-4 weeks of consistent use, the main benefit is not a stimulant-like feeling—it is better adherence to a caloric surplus, more reliable recovery nutrition, fuller glycogen stores, and a more realistic path to adding bodyweight when eating enough has been the limiting factor.

How to Use Raw Nutrition | Bum Mass Gainer | 20 Serving 12lb