Best Mass Gainer 2026

The top 8 mass gainer compared. Rated by price, features and quality — independently researched and transparently laid out.

Last updated: June 2026

What makes a good mass gainer?

When comparing mass gainer, we look at the following criteria:

Protein (g/100g) — higher is better25%
Price per active — lower is better25%
Amazon rating — higher is better20%
Sugar (g/100g) — lower is better15%
With creatine — higher is better15%

Optimum NutritionScore 75

Optimum Nutrition Serious Mass Protein Powder High Calorie

4.5(18.4k)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.5

Sugar (g/100g)15%–

With creatine15%–

£39.30

£14.40/kg

Buy*

Optimum NutritionScore 75

Optimum Nutrition Serious Mass Protein Powder High Calorie

4.5(3.2k)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.5

Sugar (g/100g)15%–

With creatine15%–

£58.54

£10.74/kg

Buy*

Optimum NutritionScore 70

Optimum Nutrition Serious Mass Protein Powder High Calorie

4.4(5.8k)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.4

Sugar (g/100g)15%–

With creatine15%–

£40.00

£14.65/kg

Buy*

SCI-MXScore 70

SCI-MX Total Mass

4.4(78)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.4

Sugar (g/100g)15%–

With creatine15%–

£21.97

£686.56/kg

Buy*

USNScore 60

USN Hyperbolic Mass Weight Gainer Protein Powder | Dutch Chocolate | 6kg

4.2(613)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.2

Sugar (g/100g)15%–

With creatine15%–

£49.94

£8.32/kg

Buy*

The Bulk Protein CompanyScore 55

The Bulk Protein Company

4.1(1.9k)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.1

Sugar (g/100g)15%–

With creatine15%–

£25.49

£849.67/kg

Buy*

BulkScore 55

Bulk Complete Mass Gainer | Vanilla | 6 servings | 43g

4.1(406)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.1

Sugar (g/100g)15%–

With creatine15%–

£12.99

£302.09/kg

Buy*

Reflex NutritionScore 55

Reflex Nutrition Instant Mass Heavyweight - Mass Gainer - Over 1000 Kcal per Serving, 60g

4.1(939)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.1

Sugar (g/100g)15%–

With creatine15%–

£30.83

£513.83/kg

Buy*

Not quite what you need?

Find YOUR best Mass Gainer

Open the comparison

Frequently Asked Questions

1What is the best mass gainer in 2026?

Based on our ranking, Optimum Nutrition Optimum Nutrition Serious Mass Protein Powder High Calorie is the top-rated mass gainer in 2026.

2How is the ranking calculated?

Our ranking is based on a weighted score combining price, features and nutritional values.

3What to look for when buying mass gainer?

When buying mass gainer, pay attention to the nutritional profile, ingredient quality and price per serving. Check for third-party testing certifications and read reviews from verified buyers to ensure the product meets your expectations.

4How often should you use mass gainer?

The frequency depends on your individual fitness goals and diet. Most users consume mass gainer once or twice daily, typically after workouts and optionally in the morning. Always follow the manufacturer's recommended serving size and consult a nutritionist if unsure.

5How much does a good mass gainer cost?

In our ranking, prices range from budget-friendly to premium options. The top-rated product costs around £14.40. A good product does not have to be the most expensive — focus on the price-to-quality ratio shown in our comparison above.

6Is an expensive mass gainer worth it?

Not necessarily. Premium products sometimes offer better ingredients or taste, but many mid-range options deliver excellent results. Our ranking shows that a high score does not always correlate with the highest price. Compare the value-for-money scores above before deciding.

* Advertising / affiliate link: As an Amazon Associate I earn from qualifying purchases – at no extra cost to you.

Best Mass Gainer 2026

The top 8 mass gainer compared. Rated by price, features and quality — independently researched and transparently laid out.

Last updated: June 2026

What makes a good mass gainer?

When comparing mass gainer, we look at the following criteria:

Protein (g/100g) — higher is better25%
Price per active — lower is better25%
Amazon rating — higher is better20%
Sugar (g/100g) — lower is better15%
With creatine — higher is better15%

Optimum NutritionScore 75

Optimum Nutrition Serious Mass Protein Powder High Calorie

4.5(18.4k)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.5

Sugar (g/100g)15%–

With creatine15%–

£39.30

£14.40/kg

Buy*

Optimum NutritionScore 75

Optimum Nutrition Serious Mass Protein Powder High Calorie

4.5(3.2k)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.5

Sugar (g/100g)15%–

With creatine15%–

£58.54

£10.74/kg

Buy*

Optimum NutritionScore 70

Optimum Nutrition Serious Mass Protein Powder High Calorie

4.4(5.8k)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.4

Sugar (g/100g)15%–

With creatine15%–

£40.00

£14.65/kg

Buy*

SCI-MXScore 70

SCI-MX Total Mass

4.4(78)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.4

Sugar (g/100g)15%–

With creatine15%–

£21.97

£686.56/kg

Buy*

USNScore 60

USN Hyperbolic Mass Weight Gainer Protein Powder | Dutch Chocolate | 6kg

4.2(613)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.2

Sugar (g/100g)15%–

With creatine15%–

£49.94

£8.32/kg

Buy*

The Bulk Protein CompanyScore 55

The Bulk Protein Company

4.1(1.9k)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.1

Sugar (g/100g)15%–

With creatine15%–

£25.49

£849.67/kg

Buy*

BulkScore 55

Bulk Complete Mass Gainer | Vanilla | 6 servings | 43g

4.1(406)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.1

Sugar (g/100g)15%–

With creatine15%–

£12.99

£302.09/kg

Buy*

Reflex NutritionScore 55

Reflex Nutrition Instant Mass Heavyweight - Mass Gainer - Over 1000 Kcal per Serving, 60g

4.1(939)

Score details

Protein (g/100g)25%–

Price per active25%–

Amazon rating20%4.1

Sugar (g/100g)15%–

With creatine15%–

£30.83

£513.83/kg

Buy*

Not quite what you need?

Find YOUR best Mass Gainer

Open the comparison

Frequently Asked Questions

1What is the best mass gainer in 2026?

Based on our ranking, Optimum Nutrition Optimum Nutrition Serious Mass Protein Powder High Calorie is the top-rated mass gainer in 2026.

2How is the ranking calculated?

Our ranking is based on a weighted score combining price, features and nutritional values.

3What to look for when buying mass gainer?

4How often should you use mass gainer?

5How much does a good mass gainer cost?

6Is an expensive mass gainer worth it?

* Advertising / affiliate link: As an Amazon Associate I earn from qualifying purchases – at no extra cost to you.