BEST VALUE MASS GAINER
50g protein per serving
XL Nutrition XTRA Mass Gainer 5.2kg - 5.2kg / Chocolate
XL Nutrition

XL Nutrition XTRA Mass Gainer 5.2kg

★★★★★
4.84 | 445 reviews |  20 Servings
£34.99 £59.99 £1.75/serving
1000 kcal Per Serving Carbohydrate + protein blend formulated for trainees struggling to eat enough food to grow.
50g Protein Per Serving Protein contributes to the growth and maintenance of muscle mass.
20 Servings Per 5.2kg 20 four-scoop servings per 5.2kg tub - three flavours, built around the calorie surplus.
Chocolate
Strawberry
Vanilla
Standard delivery
Next day (£5.99)
17,600+ Reviews
14-Day Returns
Est. 2005
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Food supplements should not be used as a substitute for a varied and balanced diet and healthy lifestyle. If you are pregnant, breastfeeding, taking medication, or under medical supervision, consult your doctor before use. Do not exceed the recommended daily intake. Store out of reach of children.

Chocolate
Strawberry
Vanilla

XL Nutrition XTRA Mass Gainer, 1000 Calories and 50g Protein Per 4-Scoop Serving

XL Nutrition XTRA Mass Gainer delivers 1000 calories per 260g serving, with 50g of protein from a whey and soy blend, 172.1g of carbohydrates from maltodextrin, ultra-fine oats powder and waxy maize starch, and 11.4g of fat. The 5.2kg tub provides 20 full servings across 3 flavour options.

The carbohydrate blend is designed for rapid absorption: maltodextrin for fast-digesting glucose, waxy maize starch for sustained energy, and oats powder for a more moderate glycaemic contribution. The protein blend uses whey protein concentrate and soy protein isolate alongside glutamine peptides for recovery. Creatine monohydrate is also included in the formula.

Mass gainers exist for one reason: some people genuinely struggle to eat enough calories to grow. Whether due to a fast metabolism, a demanding schedule or a naturally low appetite, the gap between current intake and the surplus needed for muscle growth can be hard to close with food alone. XTRA Mass Gainer turns a 1000-calorie meal into a single shake that takes under a minute to prepare.

This product suits hard gainers, ectomorphic body types and anyone in a committed gaining phase. It is not designed for people trying to lose weight or maintain a lean physique. For a lower-calorie mass gainer option, XL XTRA Protein and Carbs provides 386 calories and 33g protein per serving.

Key Benefits

1000 Calories Per Serving

Formulated for hard gainers who struggle to hit a calorie surplus with food alone.

50g Protein Per Serving

Protein contributes to a growth in muscle mass.

3 Classic Flavours

Chocolate, Strawberry, Vanilla. Mixes in water or milk without lumping.

Best Value Per 100g Protein In Range

Lowest cost-per-gram of protein across the XL Nutrition mass gainer category.

Frequently Asked Questions

How many servings does the 5.2kg tub give me?

The 5.2kg tub provides 20 servings of 260g. At one shake a day that's roughly three weeks of daily use. At a half-serving (130g, 500 calories), it stretches to about six weeks. The cost works out at £1.74 per full serving.

Who is XTRA Mass Gainer for - and who should avoid it?

It's built for hard gainers and trainers who genuinely struggle to eat enough calories to grow. If a fast metabolism, a demanding schedule or a low appetite makes hitting a daily calorie surplus difficult, a 1000-calorie shake closes that gap in under a minute. Protein contributes to the growth and maintenance of muscle mass. It is not designed for fat-loss or lean-maintenance goals - if that's you, look at XL XTRA Whey Protein or XL XTRA Protein and Carbs instead.

What's the difference between XTRA Mass Gainer and XTRA Protein and Carbs?

Mass Gainer is the heavyweight option - 1000 kcal and 50g protein per serving, designed to add total calories quickly. XTRA Protein and Carbs is the lean-gain alternative - 386 kcal and 33g protein per serving, with a more controlled carb load. If you want fast scale weight, Mass Gainer. If you want measured gains without rapid fat addition, Protein and Carbs. Both use the same XL Nutrition pricing philosophy.