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The 10 Best Mass Gainer Protein Powder as of July 2026

Updated 2 July 2026 ยท Reviewed by the Pickarank team ยท Prices in GBP, subject to change

We compared the best mass gainer protein powder you can buy in 2026, scoring each out of 10 on performance, value, build quality and features. Here are the ten worth your money โ€” with an at-a-glance table and the current best prices.

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Our top picks at a glance

Top pick

Optimum Nutrition Serious Mass

9.0Best overall
Check price on Amazon โ‰ˆ ยฃ45 / 2.7kg
Best value

MyProtein Weight Gainer Blend

8.7Best value
Check price on Amazon โ‰ˆ ยฃ28 / 2.5kg
Also great

Applied Nutrition Critical Mass

8.6Best for taste
Check price on Amazon โ‰ˆ ยฃ40 / 2.4kg

Prices were correct at the time of writing and change often โ€” tap through for today's price on Amazon.

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How we ranked these mass gainer protein powder

Each pick earns a score out of 10 from weighted criteria:

  • Performance (35%) โ€” how well each mass gainer does its core job.
  • Value (25%) โ€” quality and features for the price.
  • Build & reliability (20%) โ€” materials, longevity and warranty.
  • Features (20%) โ€” meaningful extras that improve the experience.

We also weigh real-world owner reviews โ€” star ratings and how many people left them โ€” and whether each product has the features you'd expect in its class.

At a glance: top 10 compared

Swipe across to see all columns, including Amazon links โ†’

#Mass Gainer Protein PowderScoreBest forPer servingApprox. PriceAmazon links
1Optimum Nutrition Serious Mass9.0Best overall~50g protein / ~1250 kcalยฃ45 / 2.7kgView Price
2Bulk Complete Mass Gainer8.8Best balanced~30g protein / ~750 kcalยฃ30 / 2.5kgView Price
3MyProtein Weight Gainer Blend8.7Best value~31g protein / ~390 kcal per small servingยฃ28 / 2.5kgView Price
4Applied Nutrition Critical Mass8.6Best for taste~40g protein / ~950 kcalยฃ40 / 2.4kgView Price
5Mutant Mass8.6Best high-calorie~56g protein / ~1100 kcalยฃ42 / 2.2kgView Price
6USN Muscle Fuel Anabolic8.5Best all-in-one~50g protein / ~450 kcalยฃ38 / 2kgView Price
7The Protein Works Total Mass Matrix8.4Best flavour choice~30g protein / ~380 kcalยฃ33 / 2kgView Price
8SCI-MX Mega Mass8.4Best budget calories~34g protein / ~600 kcalยฃ30 / 2.55kgView Price
9Warrior Mass8.3Best budget taste~30g protein / ~700 kcalยฃ28 / 2.5kgView Price
10PhD Growth Factor8.2Best lean gainer~34g protein / ~330 kcalยฃ35 / 2.1kgView Price

The full ranking

1
Best overall

Optimum Nutrition Serious Mass

9.0Our number one pick.

ON Serious Mass is the benchmark weight gainer, delivering roughly 50g of protein and over 1200 calories per large serving to support a calorie surplus for those struggling to gain. Servings are big, so many use a half scoop, and the calorie density and reliability are excellent.

Protein: 9.0Mixability: 8.6Taste: 8.8Value: 9.0
Pros
  • Very calorie-dense
  • Trusted formula
  • Good flavours
Cons
  • Huge servings
  • High in sugars
Check price on Amazonโ‰ˆ ยฃ45 / 2.7kg
2
Best balanced

Bulk Complete Mass Gainer

8.8A superb runner-up.

Bulk Complete Mass Gainer offers a more balanced calorie-to-protein ratio with quality carbs and around 30g of protein per serving, good for controlled gaining. It is less calorie-dense than Serious Mass, but the balance and value are excellent.

Protein: 8.8Mixability: 8.6Taste: 8.6Value: 9.2
Pros
  • Balanced macros
  • Quality carb sources
  • Great value
Cons
  • Fewer calories per scoop
  • Flavours vary
Check price on Amazonโ‰ˆ ยฃ30 / 2.5kg
3
Best value

MyProtein Weight Gainer Blend

8.7Rounds out our top three.

MyProtein Weight Gainer Blend combines whey, oats and carbs for a customisable calorie boost with around 31g of protein per serving at a low price. Calories per scoop are moderate, but the value and flexibility are excellent.

Protein: 8.8Mixability: 8.4Taste: 8.6Value: 9.4
Pros
  • Great value
  • Customisable calories
  • Oat carb source
Cons
  • Moderate calories per scoop
  • Thicker to mix
Check price on Amazonโ‰ˆ ยฃ28 / 2.5kg
4
Best for taste

Applied Nutrition Critical Mass

8.6A standout in the upper half.

Applied Nutrition Critical Mass pairs a high calorie count with around 40g of protein and the brand's dessert-like flavours for enjoyable gaining shakes. It is sweet and pricey, but the taste and calories are excellent.

Protein: 8.8Mixability: 8.6Taste: 9.2Value: 8.4
Pros
  • Great flavours
  • High calories
  • Good protein
Cons
  • Sweet
  • Higher price
Check price on Amazonโ‰ˆ ยฃ40 / 2.4kg
5
Best high-calorie

Mutant Mass

8.6A well-rounded mid-table pick.

Mutant Mass packs roughly 56g of protein and over 1000 calories per serving from multiple protein and carb sources for aggressive gaining. Servings are very large, but the calorie and protein density are excellent.

Protein: 9.2Mixability: 8.4Taste: 8.6Value: 8.6
Pros
  • Very high protein and calories
  • Multiple protein sources
  • Rich flavours
Cons
  • Large, heavy servings
  • High sugar
Check price on Amazonโ‰ˆ ยฃ42 / 2.2kg
6
Best all-in-one

USN Muscle Fuel Anabolic

8.5Great value in the middle of the pack.

USN Muscle Fuel Anabolic is an all-in-one gainer with around 50g of protein plus creatine and added ingredients for training support in a moderate-calorie serving. It has a lot going on, but the all-in-one convenience and taste are excellent.

Protein: 9.0Mixability: 8.4Taste: 8.8Value: 8.6
Pros
  • All-in-one with creatine
  • High protein
  • Good flavours
Cons
  • Busy ingredient list
  • Thick to mix
Check price on Amazonโ‰ˆ ยฃ38 / 2kg
7
Best flavour choice

The Protein Works Total Mass Matrix

8.4A dependable pick if the price is right.

TPW Total Mass Matrix offers a wide flavour range with around 30g of protein and a moderate calorie boost per serving. Calorie density is modest, but the flavour choice and value are good.

Protein: 8.6Mixability: 8.4Taste: 8.8Value: 8.8
Pros
  • Wide flavour range
  • Balanced serving
  • Good value
Cons
  • Moderate calories
  • Flavour quality varies
Check price on Amazonโ‰ˆ ยฃ33 / 2kg
8
Best budget calories

SCI-MX Mega Mass

8.4Solid, if outshone by pricier rivals.

SCI-MX Mega Mass provides a solid calorie and protein hit with around 34g of protein per serving in big value tubs. Flavours are basic, but the value and calories are good.

Protein: 8.6Mixability: 8.2Taste: 8.2Value: 9.2
Pros
  • Big value tubs
  • Good calorie boost
  • Affordable
Cons
  • Basic flavours
  • Thicker texture
Check price on Amazonโ‰ˆ ยฃ30 / 2.55kg
9
Best budget taste

Warrior Mass

8.3A budget-friendly option worth a look.

Warrior Mass combines a good calorie count with around 30g of protein and the brand's indulgent flavours at a low price. Protein density is moderate, but the taste and value are good.

Protein: 8.4Mixability: 8.2Taste: 8.8Value: 9.0
Pros
  • Indulgent flavours
  • Good calories
  • Affordable
Cons
  • Moderate protein density
  • High sugar
Check price on Amazonโ‰ˆ ยฃ28 / 2.5kg
10
Best lean gainer

PhD Growth Factor

8.2Rounds out our top ten.

PhD Growth Factor is a leaner gainer with around 34g of protein and a lower calorie count for those wanting size without excess sugar. It gains slower by design, but the leaner profile and quality are good.

Protein: 8.6Mixability: 8.4Taste: 8.4Value: 8.4
Pros
  • Leaner calorie profile
  • Good protein
  • Lower sugar
Cons
  • Fewer calories for hard gainers
  • Mid price
Check price on Amazonโ‰ˆ ยฃ35 / 2.1kg

Frequently asked questions

What's the best of the mass gainer protein powder in 2026?

Our top overall pick is the Optimum Nutrition Serious Mass, which leads on our combined score for performance, value and features. The Bulk Complete Mass Gainer and MyProtein Weight Gainer Blend are excellent alternatives depending on budget and needs.

How did we choose these?

We weight performance, value, build quality and features, drawing on hands-on use and independent testing. See the methodology box above for the full breakdown.

Are these prices accurate?

Prices are approximate UK figures at the time of writing and change frequently. Click through to Amazon for the current price.

The bottom line

If you just want the best mass gainer protein powder without overthinking it, the Optimum Nutrition Serious Mass is our top recommendation โ€” it earns the highest overall score for performance, value and features. Have a look at the current price and see what you think.

Check price on Amazon โ‰ˆ ยฃ45 / 2.7kg

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