The Bulk Protein Company Serious Gainz Mass Gainer, 5kg

The Bulk Protein Company Serious Gainz is a 5kg mass-gainer powder in White Chocolate flavour, listed with 40 servings and intended for post-workout use. The listing describes a high-calorie shake, but buyers should note that the calorie and protein figures vary across its product claims.

At a glance

The listing describes a mass-gainer shake for adding calories and carbohydrates alongside protein.
The product information gives preparation directions of three scoops (125g) with 400-500ML of water.
The powder can be mixed with water or milk according to the listing. Milk is suggested for a smoother, richer texture.

Price

£31.99Save 20%

Reference price: ~~£39.99~~

Price checked: 12 Nov 2026

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Pros and cons

Pros

A 5kg tub and 40 listed servings suit buyers planning to use a mass gainer regularly.
The listed protein sources include soy and whey, with oat flour also named in the ingredient list.
The White Chocolate flavour is clearly identified for this listing.

Cons

The powder contains milk, soy and oat, and the allergen information also flags possible egg, gluten and tree-nut presence.
Customer feedback includes complaints about grainy consistency and stomach effects, which may matter for a daily shake.

Technical specifications

15 specifications

Identity
Brand	The Bulk Protein Company
Model	Serious Gainz
Flavour	White Chocolate
Diet type	Vegetarian
Protein source	Soy, Whey

Size and format
Weight listed	5 Kilograms
Servings per container	40.0
Package type	Tub
Number of items	1
Dimensions listed	29 x 29 x 26 centimetres

Use and ingredients
Recommended use	Post-Workout
Ingredients	Maltodextrin, OAT Flour, SOY Protein Isolate, Whey (MILK) Protein Isolate, Casein (MILK) Whey (MILK) Protein Concentrate, Flavouring, Sweetener (Sucralose)
Allergen information	Contains: Egg may contain, Gluten may contain, Milk, Oat, Soy, Tree nuts may contain
Preparation directions	Mix 3 Scoops (125g) with 400-500ML of water. Once shake prepared consume the same day.
Age range	Adult

What to know before buying

Listing details to confirm

Nutrition details conflict: one claim gives approximately 460 calories, 27g protein and 74g carbohydrates per serving, while other product claims give 26-28g protein, 400+ calories and 70g-80g carbohydrates. Treat these figures as unconfirmed and check the current pack label. The title gives 5kg while the serving count is 40 and directions specify 125g per serving, so the listed quantity and serving information do not align exactly. The description specifies water in its preparation directions, while other listing text also permits milk.

Who is it for?

A good fit for

Adults seeking a calorie-dense shake to add to a bulking diet, subject to checking the nutrition information on the current pack.
Buyers who want a large tub of flavoured powder with both soy and dairy protein sources.

Less suited to

People avoiding dairy, soy or oats, or anyone needing certainty that the product is free from possible egg, gluten or tree-nut traces.
Buyers who need a verified, consistent nutrition panel or who are sensitive to grainy texture or reported stomach effects.

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

Customer reviews on Amazon

4.1 / 5 · 892 ratings

5 stars63%63%
4 stars15%15%
3 stars8%8%
2 stars5%5%
1 star9%9%

Customer feedback is divided on taste, quality, value, mixability and effectiveness, so experiences appear to vary. Reported texture concerns include a grainy consistency, and some customers mention stomach problems, including sickness and diarrhoea. These reports are particularly relevant for a powder intended for regular use, though they do not establish how any individual buyer will respond. The overall rating distribution leans positive, but includes a notable range of lower-star ratings and does not explain the reasons behind them.

Frequently asked questions

How much powder does the listing say to use?

The directions say to mix 3 scoops (125g) with 400-500ML of water and consume the prepared shake the same day.

Can Serious Gainz be mixed with milk?

The listing says it can be prepared with water or milk, while its formal directions specify water. It describes milk as a way to make the shake richer and smoother.

What are the listed nutrition figures per serving?

The claims are inconsistent. One gives approximately 460 calories, 27g protein and 74g carbohydrates, while other claims give ranges for calories, protein and carbohydrates. Check the current pack label for confirmed values.

Is this suitable for someone avoiding dairy or soy?

No. The ingredient information includes milk-derived whey and casein as well as soy protein, and the allergen statement lists milk and soy.