Optimum Nutrition Serious Mass 5.45kg Chocolate Peanut Butter
Optimum Nutrition Serious Mass 5.45kg Chocolate Peanut Butter
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Description
Optimum Nutrition Serious Mass 5.45kg Chocolate Peanut Butter is Optimum Nutrition's high-calorie weight gainer. A full serving of two heaped scoops gives about 1,250 kcal, 50 g of protein, around 250 g of carbohydrate and 3 g of added creatine, plus 25 vitamins and minerals. This 5.45 kg bag of Chocolate Peanut Butter gives 16 servings.
If you struggle to eat enough to gain size, Serious Mass makes a calorie surplus easier. Have it after training or between meals, or take half a serving at a time. Creatine increases physical performance in successive bursts of short-term, high-intensity exercise (with a daily intake of 3 g).
Key benefits
- About 1,250 kcal and 50 g protein per serving
- Around 250 g of carbohydrate
- 3 g creatine per serving
- 25 vitamins and minerals
How to use
Mix 2 heaped scoops with 710 ml of water. Use after training or between meals. You can also split the serving across the day.
Who it's for
Hard gainers and athletes who need a lot of extra calories to build size.
Allergens
Contains milk and soya. May contain gluten, egg, nuts and peanuts. Recipes can vary by flavour and may change, so always check the label on your pack.
Good to know
Food supplements should not replace a varied and balanced diet and a healthy lifestyle. Do not exceed the recommended daily intake. Keep out of the reach of children.
Product information based on the Optimum Nutrition UK product page (optimumnutrition.com/en-gb, checked 3 Oct 2026).
More information
Nutrition
Typical values — flavours may vary. Always check the product label.
Values per 100 g and per serving from the manufacturer (optimumnutrition.com/en-gb, checked 3 Oct 2026). Main panel: Choc Peanut Butter. The manufacturer's site shows 3755 kcal per 100 g, an obvious typo for 375 kcal (1571 kJ); corrected here.
Serving size: 2 heaped scoops (336 g) · Servings per pack: 16
Typical values
Per 100 g
Per 2 scoops (336 g)
Energy
1571 kJ / 375 kcal
5278 kJ/1262 kcal
Fat
2.1 g
7.0 g
of which saturates
1.2 g
3.9 g
Carbohydrate
74 g
248 g
of which sugars
3.2 g
11 g
Fibre
—
—
Protein
15 g
50 g
Salt
0.32 g
1.06 g
Vitamin A
198 µg (25%)
667 µg (83%)
Vitamin D
1.3 µg (25%)
4.2 µg (84%)
Vitamin E
2.7 mg (22%)
9.0 mg (75%)
Vitamin K
22 µg (30%)
75 µg (100%)
Vitamin C
19 mg (24%)
63 mg (79%)
Thiamin
0.28 mg (25%)
0.93 mg (84%)
Riboflavin
0.35 mg (25%)
1.2 mg (84%)
Niacin
4.0 mg (25%)
14 mg (85%)
Vitamin B6
0.34 mg (24%)
1.1 mg (82%)
Folic acid
45.3 µg (23%)
152 µg (76%)
Vitamin B12
0.56 µg (22%)
1.9 µg (75%)
Biotin
12 µg (24%)
40 µg (79%)
Pantothenic acid
1.4 mg (23%)
4.6 mg (77%)
Calcium
198 mg (25%)
667 mg (83%)
Phosphorus
155 mg (22%)
522 mg (75%)
Magnesium
83.7 mg (22%)
281 mg (75%)
Iron
5.3 mg (38%)
18 mg (126%)
Zinc
3.1 mg (31%)
11 mg (106%)
Copper
0.40 mg (40%)
1.3 mg (133%)
Manganese
0.60 mg (30%)
2.0 mg (100%)
Fluoride
0.87 mg (25%)
2.9 mg (84%)
Selenium
17 µg (30%)
55 µg (101%)
Chromium
12 µg (29%)
39 µg (97%)
Molybdenum
14 µg (29%)
48 µg (96%)
Iodine
44.7 µg (30%)
150 µg (100%)
Creatine
0.9 g
3.0 g
Ingredients: corn maltodextrin, whey protein concentrate (milk), emulsifier (lecithins (contains soy)), fat reduced cocoa powder, creatine monohydrate, flavouring, milk mineral complex, minerals (magnesium, iron, zinc, manganese, fluoride, selenium, iodine (from kelp), copper, molybdenum, chromium), vitamins (vitamin C, vitamin E, vitamin B3, vitamin A, pantothenic acid (vit. B5), D-biotin, vitamin B12, folic acid, vitamin D, vitamin B6, vitamin B1, vitamin K, vitamin B2), salt, stabilisers (cellulose gum, guar gum, carrageenan), sweetener (sucralose)
Allergens: Contains milk and soya. May contain gluten, egg, nuts and peanuts.
Directions: Mix 2 heaped scoops with 710 ml of water.
Shipping
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Check the product description above for available ingredients, nutrition and flavour information. If a detail you need is missing, ask us before ordering.
Always read the label for ingredients, allergens, directions and suitability. Information can vary by flavour and pack size. Food supplements should not replace a varied, balanced diet and a healthy lifestyle. If you need help checking a product, contact us before ordering.