Optimum Nutrition Serious Mass Gainer
Ultimate Weight Gainer for Fast Muscle Growth, Strength Gains & Post-Workout Recovery
Trusted by bodybuilders, athletes and hardgainers, this best-selling mass gainer delivers 1,250 premium calories per serving with 50g protein, 250g carbs, and 25 essential vitamins/minerals to help you:
Increase Weight of quality mass
Increase strength by increasing calories and protein
Boost workout performance with sustained energy
Enhance muscle recovery after intense training
Why Serious Mass is the UK's Top Weight Gainer?
✅ 3:1 Carb-to-Protein Ratio - Perfect for clean bulking
✅ Added Creatine & Glutamine - For muscle growth & recovery
✅ No Sugar Crashes - Steady energy release
✅ Trusted Brand - Optimum Nutrition (Link to: "/collections/optimum-nutrition") quality
Who Should Use Serious Mass?
-
Bodybuilders in off-season
-
Strength Athletes chasing PRs
-
CrossFit® & Hyrox Athletes needing extra calories
-
Vegetarian Lifters requiring mass-building nutrition
Ideal For:
-
Hardgainers struggling to add size
-
Bulking phases (off-season athletes)
-
Post-workout nutrition
-
Meal replacement when busy
Get Serious Mass 5.4kg - Fast UK Delivery!
16,200+ Verified 5★ Reviews | UK's #1 Rated Supplement Store
✅ Next Day Delivery (Order by 4PM)
🏆 Trusted by 80,000+ UK customers
⭐ 4.8/5 Average Rating across 16,200+ reviews
Recommended Usage
Add two heaping scoops (334 g) of serious muscle mass to a large blender filled with 24 fl. oz. of cold water or milk.
If desired, add ice and other ingredients, cover and blend on a high speed for 45-60 seconds – or until thoroughly mixed.
New users may find it beneficial to begin with one half of a serving daily for the first week, gradually increasing to one or more full servings several times a day.
Nutritional Information
| Typical Values | Per 330 g Serving | Per 100g |
| Energy (kj) | 5,266.0 | 1595.76 |
| Energy (kcal) | 1,259.0 | 381.52 |
| Protein (g) | 50.0 | 15.15 |
| Carbohydrates (g) | 252.0 | 76.36 |
| Of which Sugars (g) | 26.0 | 7.88 |
| Fat (g) | 5.3 | 1.61 |
| Of which saturates (g) | 3.1 | 0.94 |
| Dietary Fibre (g) | 2.4 | 0.73 |
| Sodium (mg) | 763.0 | 231.21 |
| Salt (g) | 1.9 | 0.58 |
| Biotin (ug) | 55.0 | 16.67 |
| Calcium (mg) | 407.0 | 123.33 |
| Chloride (mg) | 1,100.0 | 333.33 |
| Chromium (ug) | 140.0 | 42.42 |
| Copper (mg) | 0.9 | 0.26 |
| Folic Acid (mg) | 71.6 | 21.7 |
| Iodine (mcg) | 51.0 | 15.45 |
| Iron (mg) | 9.2 | 2.79 |
| Magnesium (mg) | 66.6 | 20.18 |
| Manganese (mg) | 0.6 | 0.18 |
| Niacin (mg) | 6.9 | 2.09 |
| Pantothenic Acid (mg) | 2.2 | 0.67 |
| Phosphorus (mg) | 596.0 | 180.61 |
| Potassium (mg) | 1,360.0 | 412.12 |
| Riboflavin (mg) | 0.5 | 0.16 |
| Selenium (ug) | 11.0 | 3.33 |
| Thiamin (mg) | 0.5 | 0.16 |
| Vitamin A (ug) | 303.0 | 91.82 |
| Vitamin B6 (mg) | 0.7 | 0.22 |
| Vitamin B12 (mg) | 0.5 | 0.14 |
| Vitamin C (mg) | 22.0 | 6.67 |
| Vitamin D (ug) | 1.9 | 0.58 |
| Vitamin E (mg) | 3.7 | 1.12 |
| Zinc (mg) | 4.1 | 1.24 |
Ingredients:
Ingredients may vary depending on flavour - Maltodextrin, Protein Blend (Whey Protein Concentrate, Calcium Caseinate, Egg Albumin),Fat Reduced Cocoa Powder, Flavorings, Mineral Blend (DiPotassium Phosphate, Sodium Chloride, Ferric Pyrophosphate, Zinc Oxide Copper Gluconate, Manganese Sulphate, Chromium Chloride Hexahydrate, Potassium Iodine), Medium Chain Tri-glycerides, Creatine Monohydrate, Choline Bitartrate, L-glutamine, Glutamine Peptides (gluten), whey powder, inositol, vitamin blend (ascorbic acid, vitamin E-acetate, niacinamide, biotin, vitamin A-acetate), calcium-D-pantothenate, pyridoxine hydrochloride, folic acid, cholecalciferol, thiamine hydrochloride, riboflavin, vitamin b12, sweetener (sucralose)
Original: $32.99
-65%$32.99
$11.55
Description
Ultimate Weight Gainer for Fast Muscle Growth, Strength Gains & Post-Workout Recovery
Trusted by bodybuilders, athletes and hardgainers, this best-selling mass gainer delivers 1,250 premium calories per serving with 50g protein, 250g carbs, and 25 essential vitamins/minerals to help you:
Increase Weight of quality mass
Increase strength by increasing calories and protein
Boost workout performance with sustained energy
Enhance muscle recovery after intense training
Why Serious Mass is the UK's Top Weight Gainer?
✅ 3:1 Carb-to-Protein Ratio - Perfect for clean bulking
✅ Added Creatine & Glutamine - For muscle growth & recovery
✅ No Sugar Crashes - Steady energy release
✅ Trusted Brand - Optimum Nutrition (Link to: "/collections/optimum-nutrition") quality
Who Should Use Serious Mass?
-
Bodybuilders in off-season
-
Strength Athletes chasing PRs
-
CrossFit® & Hyrox Athletes needing extra calories
-
Vegetarian Lifters requiring mass-building nutrition
Ideal For:
-
Hardgainers struggling to add size
-
Bulking phases (off-season athletes)
-
Post-workout nutrition
-
Meal replacement when busy
Get Serious Mass 5.4kg - Fast UK Delivery!
16,200+ Verified 5★ Reviews | UK's #1 Rated Supplement Store
✅ Next Day Delivery (Order by 4PM)
🏆 Trusted by 80,000+ UK customers
⭐ 4.8/5 Average Rating across 16,200+ reviews
Recommended Usage
Add two heaping scoops (334 g) of serious muscle mass to a large blender filled with 24 fl. oz. of cold water or milk.
If desired, add ice and other ingredients, cover and blend on a high speed for 45-60 seconds – or until thoroughly mixed.
New users may find it beneficial to begin with one half of a serving daily for the first week, gradually increasing to one or more full servings several times a day.
Nutritional Information
| Typical Values | Per 330 g Serving | Per 100g |
| Energy (kj) | 5,266.0 | 1595.76 |
| Energy (kcal) | 1,259.0 | 381.52 |
| Protein (g) | 50.0 | 15.15 |
| Carbohydrates (g) | 252.0 | 76.36 |
| Of which Sugars (g) | 26.0 | 7.88 |
| Fat (g) | 5.3 | 1.61 |
| Of which saturates (g) | 3.1 | 0.94 |
| Dietary Fibre (g) | 2.4 | 0.73 |
| Sodium (mg) | 763.0 | 231.21 |
| Salt (g) | 1.9 | 0.58 |
| Biotin (ug) | 55.0 | 16.67 |
| Calcium (mg) | 407.0 | 123.33 |
| Chloride (mg) | 1,100.0 | 333.33 |
| Chromium (ug) | 140.0 | 42.42 |
| Copper (mg) | 0.9 | 0.26 |
| Folic Acid (mg) | 71.6 | 21.7 |
| Iodine (mcg) | 51.0 | 15.45 |
| Iron (mg) | 9.2 | 2.79 |
| Magnesium (mg) | 66.6 | 20.18 |
| Manganese (mg) | 0.6 | 0.18 |
| Niacin (mg) | 6.9 | 2.09 |
| Pantothenic Acid (mg) | 2.2 | 0.67 |
| Phosphorus (mg) | 596.0 | 180.61 |
| Potassium (mg) | 1,360.0 | 412.12 |
| Riboflavin (mg) | 0.5 | 0.16 |
| Selenium (ug) | 11.0 | 3.33 |
| Thiamin (mg) | 0.5 | 0.16 |
| Vitamin A (ug) | 303.0 | 91.82 |
| Vitamin B6 (mg) | 0.7 | 0.22 |
| Vitamin B12 (mg) | 0.5 | 0.14 |
| Vitamin C (mg) | 22.0 | 6.67 |
| Vitamin D (ug) | 1.9 | 0.58 |
| Vitamin E (mg) | 3.7 | 1.12 |
| Zinc (mg) | 4.1 | 1.24 |
Ingredients:
Ingredients may vary depending on flavour - Maltodextrin, Protein Blend (Whey Protein Concentrate, Calcium Caseinate, Egg Albumin),Fat Reduced Cocoa Powder, Flavorings, Mineral Blend (DiPotassium Phosphate, Sodium Chloride, Ferric Pyrophosphate, Zinc Oxide Copper Gluconate, Manganese Sulphate, Chromium Chloride Hexahydrate, Potassium Iodine), Medium Chain Tri-glycerides, Creatine Monohydrate, Choline Bitartrate, L-glutamine, Glutamine Peptides (gluten), whey powder, inositol, vitamin blend (ascorbic acid, vitamin E-acetate, niacinamide, biotin, vitamin A-acetate), calcium-D-pantothenate, pyridoxine hydrochloride, folic acid, cholecalciferol, thiamine hydrochloride, riboflavin, vitamin b12, sweetener (sucralose)
