Mutant Mass 15lb — 1,100+ Calories and 56g Protein per Serve

Mutant Mass is one of the most recognised gainers in the world, and the 15lb is the size you buy once you know you need it. Over 1,100 calories and 56g of protein per full serving, with carbohydrates from oats, barley and sweet potato rather than straight sugar, and fats from avocado, coconut, flaxseed and pumpkin seed oils. Four flavours, in stock at EatMe Supplements.

The Problem It Solves

For genuine hard gainers, the barrier to size isn't training and it isn't protein — it's the sheer volume of food required to hold a surplus every single day, including the days you're not hungry. Eating 1,100 extra calories is a chore. Drinking them takes three minutes. That's the entire value proposition of a mass gainer, and it's a real one if you've been stuck at the same bodyweight for months.

Key Numbers (per full serving)

• 1,100+ calories — a substantial surplus in a single shake, which is the point.
• 56g protein — from a multi-source blend, so it's a genuine protein contribution rather than calories with a token protein figure attached.
• Whole food carbohydrates — oats, barley and sweet potato instead of relying on dextrose and maltodextrin for the bulk of the calorie count.
• Quality fats — avocado, coconut, flaxseed and pumpkin seed oils, adding calorie density along with a better fat profile.
• Naturally occurring BCAAs and EAAs — from the protein blend itself rather than added separately.

Why the 15lb?

A mass gainer is the fastest-moving tub in any stack — you're taking large servings, often twice a day, which means a small tub disappears in about a fortnight. If you're committed to a bulking phase, buying in 15lb is both cheaper per serve and one less thing to reorder mid-phase. If you've never used a gainer before, start smaller: the calorie load takes some getting used to, and flavour fatigue is real at this volume.

Directions

Mix 1 serving with cold water or milk and shake or blend thoroughly. Use post-workout and between meals to lift daily calorie and protein intake.

Start with a half serving. A full serve is a lot of calories to put through your stomach at once, and going straight in usually means bloating and a session of feeling unwell. Build up over a week or two. Milk instead of water pushes the calories higher again if you need it.

Who It's For

• True hard gainers — fast metabolism, training consistently, weight not shifting.
• Dedicated bulking phases — where the whole plan depends on holding a surplus.
• Athletes with high output — heavy training loads on top of an already busy day.

Not for you if you're trying to gain slowly and stay lean. A shake this calorie-dense makes it easy to overshoot, and the fat comes with the muscle.

Flavours

Triple Chocolate, Vanilla Ice Cream, Cookies and Cream, and Strawberry Banana.

Frequently Asked Questions

Will I just get fat?

A surplus builds both muscle and fat — that's unavoidable. What you control is the size of the surplus. If you're gaining much more than roughly half a kilo a week, cut the serving down. A half serve daily is plenty for most people, and the full serving is designed for genuinely high calorie needs.

Do I need it on rest days?

Yes, if your target is a daily surplus. Muscle is built with the calories you eat across the whole week, not just on training days.

Water or milk?

Water for the stated calorie figure, milk to push it higher. Milk also improves the texture considerably, which matters when you're drinking this every day for months.

Can I use it as a meal replacement?

Occasionally, when the alternative is missing a meal. It isn't designed for it though — it's meant to sit on top of your food, not instead of it.

How long will 15lb last?

At one full serving a day, around a month. At half serves, roughly double that.

Allergen Information

Contains milk, soy, oat and barley, and other ingredients derived from common allergens. Check the label for the full allergen statement.

Disclaimer

This product is not intended to diagnose, treat, cure or prevent any disease. Results vary depending on diet, training and individual response.