1,064 calories. 59.6g protein. The starter tub for the gainer that actually digests.
The 5lb is the same formula as the 15lb — Smart Carb Blend (Maltodextrin + SusCarb™ HBCD) + POOLZYME enzymes + 5-source protein matrix — in a smaller commitment. About 8 full servings. The right size to prove to yourself whether a gainer can sit lighter than what you've tried before.
Why most mass gainers fail and what this one does differently
Standard gainers run on maltodextrin and dextrose — high-osmolality carbs that pull water into the gut as they digest. That's the brick-stomach feeling. It's chemistry, not willpower.
The Smart Carb Blend pairs Maltodextrin with SusCarb™ — a patented Highly Branched Cyclic Dextrin (HBCD) with roughly half the osmotic pressure of maltodextrin alone. Faster gastric emptying, less fluid pulled into the gut, same calorie load. POOLZYME adds a multi-enzyme complex to help you actually absorb what you're drinking.
SusCarb™ (that same HBCD) is the headline ingredient in premium intra-workout products at $80+ for the carb alone. It's inside Mutant Mass at gainer pricing. 8 servings is enough to tell you whether the formula lives up to it.
References: Takii et al., Int J Sports Med 2005; Furuyashiki et al., Biosci Biotechnol Biochem 2014; Wilburn, Machek & Ismaeel, J Exerc Nutr 2021.
What the formula actually has
- Smart Carb Blend — Maltodextrin + SusCarb™ (HBCD). Lower osmolality, faster gastric clearing, steadier fuel. Not just calories — carbs with a fundamentally different gut profile.
- POOLZYME Digestive Enzyme Complex — Multi-enzyme blend designed to help absorption rather than just delivery. Most gainers skip this. The ingredient cost is real.
- 5-source protein matrix — Whey concentrate, hydrolysed whey, whey isolate, pea isolate, and buttermilk powder. 59.6g protein per full serve, 29.8g per half.
- 14g sugar per 1,064 kcal — Not zero, but well below the category average. Leading competitor gainers run 21g+. Less sugar in a calorie-dense product means more of the energy comes from complex carbohydrate.
Who the 5lb is for
- You've tried gainers before and stopped — you want to verify this one actually sits lighter before buying the full 15lb
- You're a hardgainer running a shorter bulk — 8 full shakes at 1,064 kcal covers a committed 2-week push
- You're starting with half serves (532 kcal, 3 scoops, twice daily) — the 5lb gives you about 16 sessions to build the habit
- You want the formula without the 3–4 week commitment of the 15lb
5lb or 15lb?
Mutant Mass 5lb
~8 full servings. Try the formula. Same SusCarb + POOLZYME formula — shorter commitment. Right for a single focused bulk phase or for proving the formula works for you before stocking the 15lb.
Mutant Mass 15lb
24 full servings — 3–4 weeks. The committed option. Better value per serve. Once you know the formula works for you, this is where you land.
How to use it
-
Full serve — 6 scoops (280g): 480–960ml cold water or milk, blended or shaken. 1,064 kcal, 59.6g protein. One per day on top of regular meals.
New to this gainer? Half serve for the first few days before going full. SusCarb + POOLZYME is engineered to sit lighter, but 1,000+ calories is significant volume regardless of the formula. Find your pace first.
- Half serve — 3 scoops (140g): 532 kcal, 29.8g protein. Twice daily if you want steadier calorie intake without the single-serve size getting in the way of main meals.
- Milk or water: Milk adds ~150 kcal and noticeably improves the Vanilla Ice Cream flavour. Water works if you want to keep it lighter. Cold either way.
Common questions
Is the 5lb the same formula as the 15lb?
Yes. Identical formula — Smart Carb Blend (Maltodextrin + SusCarb™), POOLZYME enzyme complex, 5-source protein matrix. Same macros per serve: 1,064 kcal, 59.6g protein, 14g sugar per 280g (full serve). The only difference is the tub size and serving count (~8 full servings vs 24 for the 15lb).
What is HBCD / SusCarb?
SusCarb™ is a patented Highly Branched Cyclic Dextrin (HBCD) — engineered from waxy corn starch. Very large molecule (~160,000–400,000 g/mol), low osmolality (draws minimal water into the gut during digestion), and faster gastric emptying than standard maltodextrin. The same ingredient used in premium intra-workout products at $80+ per tub for the carb alone. Mutant Mass combines SusCarb™ with maltodextrin in the Smart Carb Blend to maintain calorie density while improving the gut profile.
Will it sit lighter than other gainers I've tried?
HBCD + POOLZYME is engineered specifically to address the gut heaviness that high-calorie shakes cause. Start with the half serve for the first few days and assess your own tolerance. Individual experience varies, but the formula addresses the actual mechanism behind the brick-stomach feeling.
How long does the 5lb last?
About 8 full servings — roughly 8 days at one shake a day, or about 16 days at two half-serves daily. If you want to scale to a full month's supply, the 15lb is also available.
Will it support muscle gain?
Used in a calorie surplus alongside a consistent resistance training programme, yes — it supports muscle gain. Mass gainers are calories. The training decides where the calories go. Eat above your maintenance, train hard, and the gainer does its job. Individual results vary.
Does it contain allergens?
Contains milk and soy. Made in a facility that also handles dairy, wheat, gluten, tree nuts (almonds), eggs, peanuts, sesame seeds, bee pollen, molluscs, crustaceans and fish. Always check the full product label.
Full nutritional spec
Note: The nutritional information provided is a reference that may vary slightly per flavour and when product formulations are updated by the manufacturer.
