









💥 Bulk Up Smart, Recover Faster, Stay Strong!
Optimum Nutrition's Serious Mass is a 12 lb vanilla-flavored weight gainer designed for serious muscle builders. Each serving delivers 1,250 calories, 50 grams of blended protein, and over 250 grams of carbs with zero added sugar. Enhanced with 25 essential vitamins and minerals plus Creatine and Glutamine, it supports muscle growth, recovery, and immune health—perfect for adults aiming to bulk up efficiently.






| Allergen Information | Eggs, Milk, Soy, Wheat |
| Weight | 12 Pounds |
| Units | 5440 Grams |
| Use By Recommendation | Between Meals, After Weight Training & Before Bed |
| Serving Recommendation | One Scoop |
| Brand | Optimum Nutrition |
| Format | Powder |
| Age Range Description | Adult |
| Serving Size | 2 scoops, 2 scoops |
A**N
Loved it
Buy it
R**L
Works well for what it is
I bought this mass gainer two months so I can gain weight and put on muscle mass. Let me tell you it worksssss! Over the two months I’ve been taking it I’ve noticed noticeable size gains across my entire body. Though one thing if you were to take this and not train with intensity you’ll gain fat but me since I train five days a week with high intensity per session this mass gainer works very well as my post workout shake and helped significantly to put on muscle mass as well.
W**M
Exceeded
Exceeded expectations, beautiful test, now the gains begin in-shaa-Allah
K**F
Highly recommended
Awesome product
M**M
Vanilla tastes awful
I bought the vanilla flavor and it’s one of the worse mass gainers I have drank, the after taste is very bad makes me gag. I have the full bottle and I can’t even return it
K**A
Great!
Great
G**D
انه بروتين للجيم
انه جيد جدا
N**N
It's good
Result is very good work well
Trustpilot
1 week ago
2 months ago