Raw Nutrition x CBUM Mass Gainer is the weight gainer from Chris Bumstead’s collaboration with Raw Nutrition1,070 calories, 53g of protein, and 196g of carbohydrates per 4-scoop serving, built on a five-source carbohydrate blend that is notably cleaner than most mass gainers on the market. No sugar-loaded filler carbs. Includes creatine monohydrate and L-Glutamine built into every serving. Available in Vanilla, Chocolate, and Cookies & Cream. 20 servings per container.
Nutrition Per Serving (4 Scoops / 275g)
Calories1,070
Protein53g
Carbohydrates196g
Fat6g
Creatine Monohydrate2.5g
L-Glutamine2.5g
20 servings per container
Allergens: Contains milk, tree nuts (coconut), wheat, and soy. Manufactured on shared equipment that also processes egg, fish, shellfish, peanuts, tree nuts, and sesame.
What’s Inside CBUM Mass Gainer
Carbohydrate Blend196gfive distinct sources rather than straight maltodextrin:
Carb10 (Pea Starch)patented low-glycemic carbohydrate derived from peas. Fast gastric emptying with minimal insulin spike compared to traditional high-glycemic carb powders. Reduces bloating common with pure maltodextrin formulas
Sweet Potato Starchslow-digesting complex carb for sustained energy release over a longer window
Oat Flourwhole food carbohydrate source with fiber content, adds texture and nutritional value beyond raw caloric density
Quinoa Powdercomplete amino acid profile from a plant source, rounds out the micronutrient contribution of the carb blend
Dairy Protein Blend53gthree dairy-derived sources for fast and sustained amino acid delivery:
Whey Protein Concentratethe largest portion of the protein blend. Fast-digesting, rich in BCAAs and essential amino acids, supports muscle protein synthesis post-training
Whey Protein Isolatefurther filtered to 90%+ protein by weight, lower in fat and lactose, contributes to the purity of the protein fraction
Micellar Caseinslow-digesting milk protein that extends amino acid delivery over several hours, sustaining muscle protein synthesis beyond the immediate post-workout window
Creatine Monohydrate2.5gthe most research-backed performance supplement available. 2.5g per serving maintains daily creatine saturation for most active individuals supplementing creatine, or can be combined with a separate creatine dose for those seeking 5g+ daily
L-Glutamine2.5ga conditionally essential amino acid that supports gut barrier integrity, immune function, and muscle recoveryparticularly relevant during periods of high training volume and elevated metabolic stress
MCT Powder (Medium Chain Triglycerides)a clean fat source derived from coconut. MCTs are metabolized directly by the liver as fast-burning fuel rather than stored as body fat, contributing to the 6g of fat per serving without the drawbacks of saturated fat
Frequently Asked Questions About Raw Nutrition CBUM Mass Gainer
What makes this mass gainer different from most others on the market? Most mass gainers hit their calorie targets by loading cheap, high-glycemic carbohydrate sourcestypically maltodextrin or dextrosewith little attention paid to carbohydrate quality. CBUM Mass Gainer uses a five-source carb blend that includes Carb10 (a patented low-glycemic pea starch), sweet potato starch, oat flour, and quinoa powder alongside maltodextrin. The result is a more complex carbohydrate matrix that produces a steadier blood glucose response, less bloating, and more nutritional value per calorie. The inclusion of built-in creatine and glutamine also means you’re getting functional performance ingredients rather than just empty calories.
What is Carb10 and why does it matter in a mass gainer? Carb10 is a patented pea starch-derived carbohydrate developed specifically as a clean alternative to high-glycemic carb powders like dextrose. Despite being fast-absorbing, it has a low glycemic indexmeaning it replenishes muscle glycogen efficiently without producing the acute insulin spike associated with simple sugars. It also empties from the stomach quickly without the bloating and GI distress that pure maltodextrin formulas often cause. For athletes who have struggled with digestive discomfort from traditional mass gainers, Carb10 is one of the most meaningful ingredient upgrades in the category.
Why does CBUM Mass Gainer use three protein sources instead of one? The combination of whey protein concentrate, whey protein isolate, and micellar casein mirrors the natural protein composition of whole milkthe most complete food-based protein source available. Whey proteins digest quickly, delivering a rapid amino acid spike that drives muscle protein synthesis in the immediate post-workout period. Micellar casein digests slowly over several hours, extending that elevated amino acid environment well past the initial recovery window. Research has shown that the combination of fast and slow protein sources produces better muscle building outcomes than either source alone. The three-source blend gives you the best of both delivery speeds.
Is 2.5g of creatine per serving enough or should I add more? The body excretes approximately 2g of creatine daily through normal metabolism. For someone eating a moderate amount of meat, 2.5g from CBUM Mass Gainer covers the baseline daily replenishment and then some. Athletes who are not already creatine-saturated and want to build toward full muscle saturation faster may want to add an additional 2.5-5g of standalone creatine on top of what’s in the mass gainer, particularly during an initial loading phase. For those already supplementing separate creatine, the 2.5g built into CBUM Mass Gainer can be counted toward your daily total.
Who is this mass gainer best suited for? CBUM Mass Gainer is designed for athletes who have difficulty consuming enough total calories through food alone to support muscle growthcommonly called “hardgainers”as well as athletes in heavy training blocks with high caloric demands. At 1,070 calories per serving, it is not a casual protein shake. It is a serious caloric tool for serious size. It is best used as part of a structured nutrition plan where overall calorie and macronutrient targets are being tracked. It pairs naturally with CBUM Itholate Protein for days when a leaner, lower-calorie protein source is preferred.
How to Take Raw Nutrition CBUM Mass Gainer
Shake: Add 4 scoops (275g) to 16-20oz of liquid in a shaker cup. Secure the lid and shake for 20-30 seconds. Blend: Add liquid to a blender, then add 4 scoops and blend until fully dissolved. For a thicker shake, blend with ice. Use whole milk instead of water for additional calories. For individuals who cannot consume a full 4-scoop serving, half servings (2 scoops, approximately 535 calories) are a practical option for building up to the full dose.
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Who Should Not Take CBUM Mass Gainer
Contains milk, coconut (tree nut), wheat, and soynot suitable for individuals with these allergies
Manufactured on equipment shared with egg, fish, shellfish, peanuts, tree nuts, and sesamenot suitable for individuals with severe multi-allergen sensitivities
Individuals with kidney or liver conditions should consult their physician before use due to the high protein and creatine content
Not a low-calorie foodnot appropriate as a daily beverage for individuals who are not in a structured caloric surplus protocol
Consult a physician before use if pregnant, nursing, or have a pre-existing medical condition
Keep out of reach of children
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
