£65.00

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary

Chocolate Peanut Butter, 1101534

Price data last checked 30 day(s) ago - will refresh soon

View at Amazon

We'll watch every seller, every day. One email when your price arrives.

This is the most expensive it has ever been. Walk away.

£65 today · previous high £65 · all-time low £45

NEW HERE?

Amazon shows you one price. We show you all of them.

Tosheroon watches Amazon prices so you don't have to. Every product on Amazon has a price history — we make it visible. Set the price you'd actually pay, and we'll email you the second it gets there. No app, no account, one email.

WHAT'S ON THIS PAGE

↓ Price chart
when this has been cheap or pricey
↓ Forecast
where the price is heading next
↓ Statistics
all-time high & low, recent range
↑ Price alert
name your number, we'll email you

Price History & Forecast

Grey patches = out of stock. Cheaper = lower on the chart. Hover for exact prices.

Last 61 days · 61 data points (no recent data)

Historical
Generating forecast…
£65.00 £42.87 £47.70 £52.53 £57.35 £62.18 £67.01 24 May 2026 08 June 2026 23 June 2026 08 July 2026 23 July 2026

Price Distribution

Price distribution over 61 days • 5 price levels

Days at Price
Current Price
24 days 9 days 12 days 11 days 5 days · current 0 6 12 18 24 £45 £58 £60 £63 £65 Days at Price

Price Analysis

Most common price: £45 (24 days, 39.3%)

Price range: £45 - £65

Price levels: 5 different prices over 61 days

Description

Optimum Nutrition has been helping performance-focused athletes for over 35 years achieve their goals. This time, we bring you the intense and dialled-up version of our muscle-building and weight gain formula. Meet the Serious Mass high-calorie protein powder, designed for true sports enthusiasts and high-performance athletes. Serious Mass is the ultimate muscle-building and mass gainer formula. This protein powder makes the ideal post-workout and between meals shake for sizing up your goals. Every serving of this mass gainer contains 25 essential vitamins and minerals (including vitamin D, B12, E, Biotin and Magnesium), over 1,250 calories to boost your calorie intake, 50 grams of protein to support muscle growth* and 250 grams of carbohydrates helping support muscle recovery**. Plus, every serving has also been enriched with 3 grams of creatine monohydrate that increases your physical performance during high-intensity exercise***. Designed for the goal-focused athlete, our ON Serious Mass High Calorie Weight Gainer protein powder comes in 6 great tasting flavours: banana, chocolate peanut butter, chocolate, cookies & cream, strawberry and vanilla. Blend this quality protein with fruit or nut butter for extra calories and discover your optimum taste combination. Serious Mass is quick, convenient, and easy to prepare: simply mix 2 heaped scoops with 710 ml of water or plant milk. Use it after intense training as a part of your recovery routine, between meals, and before bed to add calories, carbs, and protein to your healthy, balanced diet. * Source: EFSA Journal 2010;8(10):1811; 2011;9(6):2203 ** Source: EFSA Journal 2011;9(6):2211 ***Source: EFSA Journal 2011;9(7):2303 Ingredients Corn Maltodextrin Whey Protein Milk (Emulsitier: Lecithin [Soyiy e nced Cocoa Powder, Crecide, Selenum Flayuring, MILK Minerals Complex, Minerals (Magnesium, Iron, Zinc, Manganese, Chromium), Vitamins (C. E. B3, A, B5, B7. B12, B9, D, B6, B1, K, B2), Salt Stabilisers (Cellulose Gum, Guar Gum Carrageenan). Sweetenor (succalose) Directions Add 2 heaped scoops (330 g) of Serious Mass to a blender filled with 710 ml (24 oz) of water. Blend for 45-60 seconds. Then add a few ice cubes and, if desired, other calorie-contributing ingredients (see "Supercharge Your Serious Mass" on the opposite panel) and blend for an additional 30-45 seconds. TIP: New users may find it beneficial to begin with 1/2 a serving daily for the first week and then gradually increase to 1 or more full servings several times a day. Safety Warning Store in a cool dry place away from direct sunlight and moisture. Do not use if the inner safety seal under the cap is broken or missing. Manufacturer Contact Information 4 Waterside, Dublin 24, Ireland

Key Features

Low fat mass gainer with over 1250 CALORIES and 50g of PROTEIN per serving to support muscle growth* plus 3 grams of CREATINE MONOHYDRATE to support performance**

No added sugar protein powder formula with 25 vitamins and minerals and less than 5g fat per serving, plus over 250 grams of CARBOHYDRATES helping support muscle recovery***

Serious Mass protein powder comes in 6 flavours (banana, chocolate peanut butter, chocolate, cookies & cream, strawberry and vanilla) & contains sweetener

To prepare weight gainer mix 2 scoops with 710 ml of water or plant milk, add fruit or nut butters for a tasty and calorific post workout or between meals protein smoothie

Source EFSA Journal *2010;8(10):1811; 2011;9(6):2203; ** 2011;9(7):2303; ***2011; 9(7):2303

Product Specifications

Model
1101534
Colour
Chocolate Peanut Butter
Size
5.45 Kg (pack Of 1)
Domain
Amazon UK
Listed Since
28 September 2015

Barcode

No barcode data available

Similar Products You Might Like

Optimum Nutrition Serious Mass - Peanut Butter, 1250 Cal, 50g Protein
99% match

Optimum Nutrition Serious Mass - Peanut Butter, 1250 Cal, 50g Protein

Optimum Nutrition

£32.99 23 Jul 2026
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Cookies and Cream, 16 Servings, 5.45 kg, Packaging May Vary
98% match

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Cookies and Cream, 16 Servings, 5.45 kg, Packaging May Vary

Optimum Nutrition

£58.00 24 Jun 2026
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Banana, 16 Servings, 5.45 kg, Packaging May Vary
97% match

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Banana, 16 Servings, 5.45 kg, Packaging May Vary

Optimum Nutrition

£58.54 26 Jun 2026
Reflex Nutrition Instant Mass Heavyweight - 5.4kg Chocolate
96% match

Reflex Nutrition Instant Mass Heavyweight - 5.4kg Chocolate

Reflex Nutrition

£54.54 05 Aug 2026
Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Strawberry Crème, 5kg)
96% match

Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Strawberry Crème, 5kg)

Warrior

£25.99 25 Jun 2026
Reflex Nutrition Instant Mass Heavyweight - Mass Gainer - Over 1000 Kcal per Serving, 60g Protein, Creatine - High Calorie Post Workout or Before Bed Protein Shake (Strawberries & Cream, 5.4 kg)
96% match

Reflex Nutrition Instant Mass Heavyweight - Mass Gainer - Over 1000 Kcal per Serving, 60g Protein, Creatine - High Calorie Post Workout or Before Bed Protein Shake (Strawberries & Cream, 5.4 kg)

Reflex Nutrition

£51.08 11 Aug 2026
Warrior Serious Gainz 2kg - Chocolate Mass Gainer Protein
96% match

Warrior Serious Gainz 2kg - Chocolate Mass Gainer Protein

Warrior

£17.47 21 Aug 2026
Weider Mega Mass 4000 (4kg) Chocolate Flavour, Mass Gainer with High Content of Complex Carbohydrate Blend, for Energy and Muscle Mass
96% match

Weider Mega Mass 4000 (4kg) Chocolate Flavour, Mass Gainer with High Content of Complex Carbohydrate Blend, for Energy and Muscle Mass

Weider

£69.83 25 Jul 2026
Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Vanilla Cheesecake, 5kg)
96% match

Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Vanilla Cheesecake, 5kg)

Warrior

£49.99 26 Jun 2026
SCI-MX Ultra Mass XL - 4kg - High Calorie Muscle Mass Protein Powder - Chocolate - Muscle Growth & Weight Gain • 60g Protein + 1088 Calories per Serving + 5g Creatine
96% match

SCI-MX Ultra Mass XL - 4kg - High Calorie Muscle Mass Protein Powder - Chocolate - Muscle Growth & Weight Gain • 60g Protein + 1088 Calories per Serving + 5g Creatine

SCI-MX

Price unavailable
Optimum Nutrition Serious Mass High Calorie Protein Powder
96% match

Optimum Nutrition Serious Mass High Calorie Protein Powder

Optimum Nutrition

£34.79 01 Aug 2026
Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Salted Caramel, 5kg)
96% match

Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Salted Caramel, 5kg)

Warrior

£25.99 25 Jun 2026
Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Banana Crème, 5kg)
96% match

Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Banana Crème, 5kg)

Warrior

Price unavailable
Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (White Chocolate, 5kg)
96% match

Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (White Chocolate, 5kg)

Warrior

£49.99 24 Jun 2026
Warrior Mass Gainer Protein Powder 5kg, 18 Servings – 1000 kcal High Calorie Weight Gainer with Whey & Casein – 61g Protein Shake Plus Glutamine – Muscle Growth Supplements – Double Chocolate
96% match

Warrior Mass Gainer Protein Powder 5kg, 18 Servings – 1000 kcal High Calorie Weight Gainer with Whey & Casein – 61g Protein Shake Plus Glutamine – Muscle Growth Supplements – Double Chocolate

Warrior

£49.99 24 Jun 2026
Weider Mega Mass 4000 (4kg) Strawberry Flavour, Mass Gainer with High Content of Carbohydrate and Protein Blend, for Energy and Muscle Mass
96% match

Weider Mega Mass 4000 (4kg) Strawberry Flavour, Mass Gainer with High Content of Carbohydrate and Protein Blend, for Energy and Muscle Mass

Weider

Price unavailable
The Bulk Protein Company Serious Protein 4kg - Cookies & Cream
96% match

The Bulk Protein Company Serious Protein 4kg - Cookies & Cream

The Bulk Protein Company

£44.99 04 Aug 2026
The Bulk Protein Company SERIOUS Protein - 4kg Banana
96% match

The Bulk Protein Company SERIOUS Protein - 4kg Banana

The Bulk Protein Company

£49.99 04 Aug 2026
Dymatize ISO 100 Hydrolyzed Chocolate Peanut 2264g - Whey Protein Hydrolysat + Isolat Powder
96% match

Dymatize ISO 100 Hydrolyzed Chocolate Peanut 2264g - Whey Protein Hydrolysat + Isolat Powder

Dymatize

£111.17 25 Jun 2026
Protein Works | Total Mass Matrix 360 - Gold, Strawberries & Cream, 2.12kg
96% match

Protein Works | Total Mass Matrix 360 - Gold, Strawberries & Cream, 2.12kg

Protein Works

£29.42 01 Aug 2026
The Bulk Protein Company Serious Protein 4kg - Strawberry
96% match

The Bulk Protein Company Serious Protein 4kg - Strawberry

The Bulk Protein Company

£49.99 05 Aug 2026
Optimum Nutrition Serious Mass Protein Powder - Chocolate Mint
96% match

Optimum Nutrition Serious Mass Protein Powder - Chocolate Mint

Optimum Nutrition

£52.95 25 Jun 2026
Protein Works | Total Mass Matrix 360 - Gold, Salted Caramel Bandit, 2.12kg
96% match

Protein Works | Total Mass Matrix 360 - Gold, Salted Caramel Bandit, 2.12kg

Protein Works

£22.49 01 Aug 2026
Olimp Whey Protein Complex 100% (1800 g) - Peanut Butter
96% match

Olimp Whey Protein Complex 100% (1800 g) - Peanut Butter

OLIMP SPORT NUTRITION

Price unavailable