The Bulk Protein Company Serious Gainz Mass Gainer, 5kg

1 / 7

Product guide

The Bulk Protein Company Serious Gainz Mass Gainer, 5kg

The Bulk Protein Company Serious Gainz is a bulk mass-gainer powder in a 5kg tub, listed in Salted Caramel flavour. The listing describes a high-calorie shake for bulking and post-workout use, with serving nutrition claims that should be treated as approximate.

At a glance

The listing claims about 460 calories, 27g protein and 74g carbohydrates per serving. These are product claims, not independent measurements.
A serving is specified as three scoops (125g), mixed with 400–500ml water. The listing also allows milk.
Ingredients include oat flour, soy protein isolate, whey proteins and casein. The listing names milk, oats and soy as allergens.

Price

£30.39Save 24%

Reference price: ~~£39.99~~

Price checked: 12 Nov 2026

View offer Ahead of Black FridayExplore the selection

Often bought together

Serious Shredz Bulk Diet Whey Protein Powder 4kg Meal Replacement Shake | Diet Whey Protein, 133 Servings, L-Carnitine, Green

£39.99

Warrior Creatine Monohydrate Powder 500g Pure Micronised (166 Servings) | Creatine Supplement for Women & Men, Easy Dissolve,

£9.31

Pros and cons

Pros

A 5kg tub and listed 40 servings suit buyers planning regular use during a bulking phase.
The listed directions allow mixing with water or milk, and the powder can also be added to foods such as oats or smoothies, according to the product description.

Cons

A full 125g serving is a substantial portion, so it may not suit buyers seeking a lower-calorie protein shake.
Customer feedback reports grainy texture, and opinions on taste and mixability vary.

Technical specifications

16 specifications

Identity
Brand	The Bulk Protein Company
Model	Serious Gainz

Product details
Weight listed	5 Kilograms
Flavour	Salted Caramel
Servings per container	40.0
Protein source	Soy, Whey
Recommended use	Post-Workout
Package type	Tub
Age range	Adult
Manufacturer part number	B142

Serving and preparation
Calories per serving (claimed)	approximately 460 calories
Protein per serving (claimed)	27g
Carbohydrates per serving (claimed)	74g
Serving directions	Mix 3 Scoops (125g) with 400-500ML of water. Once shake prepared consume the same day.

Ingredients and allergens
Ingredients	Ultra-Fine OAT Flour, Ultra-Premium Maltodextrin, SOY Protein Isolate, Flavouring, Anti-Caking Agent (Silicon Dioxide), Salt, Whey (MILK) Protein Isolate, Casein (MILK) Protein, Whey (MILK) Protein Concentrate, Sweetener (Sucralose). For Allergens, please see ingredients in Bold/CAPITALS. May also contain EGG, MILK, GLUTEN, NUTS and PEANUTS.
Allergen information	Contains: Milk, Oats, Soy

What to know before buying

Listing details to confirm

Serving nutrition is presented approximately in the feature text, while the manufacturer section gives protein as 26–28g and carbohydrates as 70g–80g, rather than identical fixed figures. Flavour availability also varies across listing copy, so confirm the selected variant is Salted Caramel. The ingredients state possible traces of egg, milk, gluten, nuts and peanuts in addition to named allergens. Intended for healthy adults over 18. Store in a cool, dry place out of reach of children. Prepared shake should be consumed the same day.

Who is it for?

A good fit for

Adults looking to add a calorie-dense shake to a structured bulking diet.
People who want a powder listed for post-workout use and are comfortable with a three-scoop serving.

Less suited to

Anyone avoiding milk, oats or soy, or who needs to avoid possible egg, gluten, nut or peanut traces.
Buyers seeking a low-calorie shake, a single-ingredient protein powder or consistently smooth texture based on the reported mixed feedback.

The Bulk Protein Company Serious Gainz Mass Gainer, 5kg · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 189 ratings

5 stars66%66%
4 stars13%13%
3 stars11%11%
2 stars4%4%
1 star6%6%

Customer feedback includes reports of effectiveness for training and appreciation of value, but opinions on taste, quality and mixability are mixed, and texture is described as grainy. For a powder intended as a substantial 125g bulking shake, texture and mixing may matter when using it regularly. The overall rating distribution is mostly five-star but includes a meaningful spread of lower ratings, so it does not resolve those specific concerns.

Positive themes

Customers report that the powder is effective for training.

Negative themes

Customers describe the texture as grainy.

Mixed feedback

Taste receives both favourable and unfavourable reactions.
Opinions differ on product quality and how well it mixes.
Value for money receives mixed feedback.

Frequently asked questions

How much should I use per serving?

The directions specify three scoops (125g) mixed with 400–500ml of water. The listing also says it can be mixed with milk.

What nutrition does the listing claim per serving?

The feature copy gives approximately 460 calories, 27g protein and 74g carbohydrates. Other manufacturer copy gives protein as 26–28g and carbohydrates as 70g–80g, so treat these numbers as listing claims rather than precise verified values.

Which allergens and possible traces are listed?

The listing identifies milk, oats and soy as allergens. Its ingredient text also says it may contain egg, milk, gluten, nuts and peanuts.

Is it suitable for children?

The supplied advisory says it is intended for healthy adults over 18 and should be stored out of reach of children.