# 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.

- [Original product page](https://bargainpostbox.co.uk/product/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- [View offer](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: The Bulk Protein Company
- Model: Serious Gainz
- Category: Beauty & Health > Vitamins & Supplements
- Price: 31.99 GBP
- Previous price: 39.99 GBP
- Discount: 20%
- Price checked: 2026-11-12T18:41:32.420Z
- Rating: 4.1 / 5
- Reviews: 892

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## 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.

## 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.

## 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

## Before you buy

- 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.

## 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.

## Customer feedback

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.

## Offer details

- The product advisory says it is intended for healthy adults over 18 and should be stored in a cool, dry place out of reach of children.

## Alternative options

- [Kinetica Sports OatGain Mass Gainer–Raspberry Yoghurt, 2.4Kg, 15 Servings \| 46g Protein, 78g Carbs & 620 Kcal/Serve \|Optimum Bulk Weight Gain Whey Protein Supplement \| WADA & Informed Sport Approved](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- [SCI-MX Total Mass • Mass Gainer Protein Powder • Vanilla Flavour • 2Kg \| SCI-MX Total Mass • Vanilla Flavour • Mass Gainer Protein Powder • High Calorie Support • Muscle Gain](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- [USN Hyperbolic All in One Mass \(2000g\) Chocolate - Weight Gainer - with Creatine](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- [NAKED Mass - Unflavored Natural Weight Gainer Protein Powder - 3531g - GMO, Gluten, and Soy Free. No Artificial Ingredients - 1,216 Calories per Serving](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- [Boho Organic Protein Powder 1kg, Vegan, Unsweetened, No Flavourings \| Organic Vegan Protein Powder, Unsweetened - No Sweeteners, No Flavourings, No Gums - Dairy, Gluten & Soya Free](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- [Pure Creatine Monohydrate Powder - 315g \(90 Servings\) - Easy Dissolve Creatine Powder, Unflavoured & Micronised \(Not Creatine Gummies or Creatine Tablets\), Vegan Creatine for Women and Men](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- [Kinetica Sports Whey Protein Powder - Chocolate, 1 Kg, 33 Servings \| 23g Protein, 5.5g BCAA Amino Acid & 4.32g Glutamine \| Recovery Shake for Optimum Nutrition \| WADA & Informed Sport Approved](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- [Kollo Creatine Monohydrate Powder -Muscle Growth & Energy- Pack of 3 \(450g\) \| Unflavoured creatine monohydrate powder with 5g per serving to support strength and high-intensity exercise performance](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- [Kinetica Sports Whey Protein Powder - Unflavoured, 2.27 Kg, 76 Servings \| 23g Protein, 5.5g BCAA Amino Acid \| Recovery Shake for Optimum Nutrition \| Tested to WADA Standards & Informed Sport Approved](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- [PhD Nutrition Diet Whey Low Calorie Protein Powder, Low Carb, High Protein Lean Matrix, Vanilla Crème Diet Whey Protein Powder, High Protein, 80 Servings Per 2 kg Bag](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)
- [Free Soul Sculpt Protein Powder \| 20g Protein \| Chocolate \| 20 Servings \| Hybrid Whey Protein Powder with Maca, Iron, Calcium, Biotin & B Vitamins \| Plus Digestive Enzymes](https://bargainpostbox.co.uk/visit/free-soul-sculpt-chocolate-protein-powder)
- [Bettervits Creatine Monohydrate Powder \| Ideal for Muscle Growth & Recovery - Unflavoured Creatine 5g \| 100% Pure Micronised Creatine Powder \| Supports Strength Performance \| 60 Servings](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)

## Add-ons

- [Warrior Creatine Monohydrate Powder 500g Pure Micronised \(166 Servings\) \| Creatine Supplement for Women & Men, Easy Dissolve,](https://bargainpostbox.co.uk/visit/warrior-creatine-monohydrate-powder-500g)
- [Warrior RAW Protein Bars Multipack 24 x 75g High Protein Oat Flapjack \| 20g Protein Per Bar, Bulk Protein Bars, Low Sugar, Hi](https://bargainpostbox.co.uk/visit/the-bulk-protein-company-serious-gainz-mass-gainer-5kg)

## Images

![The Bulk Protein Company Serious Gainz Mass Gainer, 5kg — 1](https://bargainpostbox.co.uk/i/jQRdw55gV6GYkCUQL9OtIuiXFzjC9Wv23iTaJC10j2F0BUOjkwxO0oyZr2xSa4S8rP8HTLqmZp_YbQCHhafKda_rS8dc5O3O9-ge1jQTWH0hd6VZuWYznoNO.jpg)

![The Bulk Protein Company Serious Gainz Mass Gainer, 5kg — 2](https://bargainpostbox.co.uk/i/S0oK3wP0B_101Wx-aSu-owd6hBr2N9lAgRYBHjGU4V1Ht9dR6Btxo7ad53c6wvsePoM_wr9V9Wo-P40MhIKjO3ny34JaZC-pcuRfCeZwxvJJyQ5gotvzYkKf.jpg)

![The Bulk Protein Company Serious Gainz Mass Gainer, 5kg — 3](https://bargainpostbox.co.uk/i/9y_Zr9VWpYx-vYrXdud_QTkYcCaPSfFKOuXw8gCPpbjKbN6CfeKYMn90kvrofgt65vi_A7QXk_-9R_jmqBy7WZ-cLSi_YiHS0BZ8fiCJNLZjROmiPrzN4NrW.jpg)

![The Bulk Protein Company Serious Gainz Mass Gainer, 5kg — 4](https://bargainpostbox.co.uk/i/VvIZ3ReZeKM7sFE8___NOBsNjkuOE7n8PlbjPKPWGNLQVILp7tDA2kuHAb-CICr9j9Aa8sCB3GRxyXQ4Wyjoapk0AL-ncMMlngIGG_VdfCTTxAiIf0LZ8XZD.jpg)

![The Bulk Protein Company Serious Gainz Mass Gainer, 5kg — 5](https://bargainpostbox.co.uk/i/pndN8HE3sTXtHASMsNz3mQLP1o0wcgVqptAybDu_u7HlzSGkuJCF63nYlRq8GgHlE92umtsxUbs3aT7lDhKPcd38A29CyOhtX6HShLdPyGoToLWjOBYnUCIQ.jpg)

![The Bulk Protein Company Serious Gainz Mass Gainer, 5kg — 6](https://bargainpostbox.co.uk/i/GEc264ScjQLX9wDaTRZG0O5vue6Ykukbx1d16CYtzvJ2y8mOSCG7j0Q74XhTnX3zLbR6KWszIjDr6E8Q70Jn6dhL5_r2_hWNSIG56bfYf79hZvPGyJzYCJYa.jpg)

![The Bulk Protein Company Serious Gainz Mass Gainer, 5kg — 7](https://bargainpostbox.co.uk/i/ojtTe2GAuYzt9qD-ixXiY-ABwsxSVZT8HwsbwZitwdhcAR48c2fFj0RjdP20Rjj17poeP6wR1oLZBHEZcyIrQf8Z4RmU0eAiMqObOG_ZCSmERJ_sZpvIFlGB.jpg)