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5 Best Weight Gainers of 2026

Last Updated - 27/05/2026

1
Best Choice
12% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Optimum Nutrition
12% Off

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate, 16 Servings, 5.45 kg

Optimum Nutrition

£52.95

£59.99
(12% Off)

More Details
Main highlights
- To prepare weight gainer mix 2 scoops with 710 ml of water or plant milk, add fruit or nut butters for a tasty and calorific post workout or between meals protein smoothie
- Source EFSA Journal *2010;8(10):1811; 2011;9(6):2203; ** 2011;9(7):2303; ***2011; 9(7):2303
- Serious Mass protein powder comes in 6 flavours (banana, chocolate peanut butter, chocolate, cookies & cream, strawberry and vanilla) & contains sweetener
- No added sugar protein powder formula with 25 vitamins and minerals and less than 5g fat per serving, plus over 248 grams of CARBOHYDRATES helping support muscle recovery***
- Low fat mass gainer with over 1262 CALORIES and 50g of PROTEIN per serving to support muscle growth* plus 3 grams of CREATINE MONOHYDRATE to support performance**
£52.95
£59.99 (12% Off)
2
Best Value
21% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Optimum Nutrition
21% Off

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate, 16 Servings, 5.45 kg

Optimum Nutrition

£47.65

£59.99
(21% Off)

More Details
Main highlights
- To prepare weight gainer mix 2 scoops with 710 ml of water or plant milk, add fruit or nut butters for a tasty and calorific post workout or between meals protein smoothie
- Source EFSA Journal *2010;8(10):1811; 2011;9(6):2203; ** 2011;9(7):2303; ***2011; 9(7):2303
- Serious Mass protein powder comes in 6 flavours (banana, chocolate peanut butter, chocolate, cookies & cream, strawberry and vanilla) & contains sweetener
- No added sugar protein powder formula with 25 vitamins and minerals and less than 5g fat per serving, plus over 248 grams of CARBOHYDRATES helping support muscle recovery***
- Low fat mass gainer with over 1262 CALORIES and 50g of PROTEIN per serving to support muscle growth* plus 3 grams of CREATINE MONOHYDRATE to support performance**
£47.65
£59.99 (21% Off)
3
11% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Optimum Nutrition
11% Off

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Vanilla, 8 Servings, 2.73 kg, Packaging May Vary

Optimum Nutrition

£32.95

£36.99
(11% Off)

More Details
Main highlights
- SUPPORTS SERIOUS SIZE – great for those aspiring to be bigger, for those who find it hard to gain weight / muscle, or for those on the go who have high caloric needs due to intense training
- CALORIE RICH PROTEIN SOURCE – the ultimate gainer powder which can be used post-workout or between meals
- ADDED CREATINE, L-GLUTAMINE & GLUTAMIC ACID
- 50 g – 53 g PROTEIN per serving
- 250 g+ CARBOHYDRATES per serving
- 1,255-1272 CALORIES per serving – when mixed with water
£32.95
£36.99 (11% Off)
4
20% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Optimum Nutrition
20% Off

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Vanilla, 8 Servings, 2.73 kg, Packaging May Vary

Optimum Nutrition

£29.65

£36.99
(20% Off)

More Details
Main highlights
- SUPPORTS SERIOUS SIZE – great for those aspiring to be bigger, for those who find it hard to gain weight / muscle, or for those on the go who have high caloric needs due to intense training
- CALORIE RICH PROTEIN SOURCE – the ultimate gainer powder which can be used post-workout or between meals
- ADDED CREATINE, L-GLUTAMINE & GLUTAMIC ACID
- 50 g – 53 g PROTEIN per serving
- 250 g+ CARBOHYDRATES per serving
- 1,255-1272 CALORIES per serving – when mixed with water
£29.65
£36.99 (20% Off)
5
17% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Optimum Nutrition
17% Off

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate, 8 Servings, 2.73 kg, Packaging May Vary

Optimum Nutrition

£30.69

£36.99
(17% Off)

More Details
Main highlights
- To prepare weight gainer mix 2 scoops with 710 ml of water or plant milk, add fruit or nut butters for a tasty and calorific post workout or between meals protein smoothie
- Source EFSA Journal *2010;8(10):1811; 2011;9(6):2203; ** 2011;9(7):2303; ***2011; 9(7):2303
- Serious Mass protein powder comes in 6 flavours (banana, chocolate peanut butter, chocolate, cookies & cream, strawberry and vanilla) & contains sweetener
- No added sugar protein powder formula with 25 vitamins and minerals and less than 5g fat per serving, plus over 250 grams of CARBOHYDRATES helping support muscle recovery***
- Low fat mass gainer with over 1250 CALORIES and 50g of PROTEIN per serving to support muscle growth* plus 3 grams of CREATINE MONOHYDRATE to support performance**
£30.69
£36.99 (17% Off)

5 Best Weight Gainers of 2026

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate, 16 Servings, 5.45 kg

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate, 16 Servings, 5.45 kg

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Vanilla, 8 Servings, 2.73 kg, Packaging May Vary

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Vanilla, 8 Servings, 2.73 kg, Packaging May Vary

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate, 8 Servings, 2.73 kg, Packaging May Vary

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