1,250 calories per serving for visible size gains
Trusted by serious lifters for decades | 30-day satisfaction guarantee
Optimum Nutrition Serious Mass
Get it between Monday, July 20 and Friday, July 24.
My boyfriend uses it and it really works! With proper maintenance of the diet and regular exercise, extremely useful for gaining mass
Shipping & Returns
High-calorie density trusted by dedicated lifters for decades
1,250 Calories Per Serving
Delivers the surplus hardgainers need to add visible size when whole foods fall short.
What arrives with every Serious Mass tub
8 servings delivering 1,250 calories each for steady size gains.
50g protein and 252g carbs per shake to fuel training and recovery.
Rich chocolate flavor that mixes easily for daily consistency.
Proven formula trusted by serious lifters for decades.
From stalled gains to visible size and strength
Drag the slider to compare. Consistent use of the 1,250-calorie formula creates the surplus needed for dedicated athletes who struggle to gain.
Real lifters share their Serious Mass results
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
Marcus T.
Finally broke my weight plateau
Took two scoops with whole milk after training. Hit 1,250 calories easy and put on 6 lbs in three weeks without feeling stuffed all day.
Derek Hale
Chocolate actually tastes good
Mixed with water it’s thick but not chalky. The 252 g carbs keep me fueled through long sessions and I recover faster.
Priya K.
Helped me gain steadily
I’m a hardgainer and this is the first shake that actually moved the scale. One serving a day plus normal meals did it.
Tyler R.
50 g protein per shake is legit
I add peanut butter and oats on top. Still under 10 minutes to prep and I’m consistently over 4,000 calories now.
Jamal S.
No more struggling to eat enough
The tub lasts me eight solid days at one serving daily. Simple habit that actually works for size.
Lena Voss
Trusted brand for a reason
Optimum Nutrition has been around forever. I trust the macros and the chocolate flavor isn’t overly sweet.
Carlos Mendez
252 g carbs fuel my lifts
I drink half before training and finish after. Energy stays high and I’m not crashing mid-workout anymore.
Ryan Cole
6 lbs in a month, no bloat
Used to force-feed chicken and rice. This shake replaced two meals and I finally look like I lift.
Aisha Patel
Consistent results every week
The 8-serving tub keeps me accountable. One scoop a day and the scale keeps moving up slowly.
Brandon Lee
Best mass gainer I’ve tried
Tried cheaper brands that tasted awful. Serious Mass mixes smooth and the calorie count is actually accurate.
Samir Khan
Recovery feels faster
50 g protein plus all those carbs means less soreness the next day. I can train harder more often.
Nicole Brooks
Finally gaining without force feeding
One shake replaces the struggle of eating six big meals. Chocolate flavor keeps it from feeling like a chore.
What lifters are saying on Facebook
Marcus Rivera
3h ago
Finally found a shake that actually hits 1,250 calories without tasting like cement. Serious Mass is the real deal.
Jared Thompson
Yesterday
Gained 8 lbs in five weeks. One scoop after training and I’m done stressing about hitting calories.
Elena Vargas
2d ago
The chocolate flavor is actually drinkable. 50 g protein and 252 g carbs in one go is crazy efficient.
Kyle Bennett
3d ago
Been using it for a month. Scale finally moves and I don’t feel like I’m force-feeding every night.
Tasha Williams
4d ago
Optimum Nutrition quality shows. Mixes easy, no clumps, and I recover better between heavy sessions.
David Soto
5d ago
Hardgainer here. This is the only gainer that didn’t make me feel sick after drinking it. Solid product.
Serious Mass reviews from dedicated lifters
One serving gives me 1,250 calories. Finally stopped losing weight during heavy training blocks.
2 days ago
Tastes decent for how many macros are in it. I add ice and it goes down easy post-workout.
3 days ago
The 8-serving tub lasts me just over a week at one shake a day. Simple routine that works.
4 days ago
252 g carbs per shake keeps my energy high. I’m not crashing halfway through my sessions anymore.
5 days ago
50 g protein helps with recovery. I feel less sore the day after heavy leg days.
6 days ago
Gained 7 lbs in a month. Never thought a shake could make that much difference.
1 week ago
Chocolate flavor isn’t too sweet. I mix it with almond milk and it’s actually enjoyable.
1 week ago
Been a hardgainer my whole life. This is the first product that moved the scale consistently.
1 week ago
Optimum Nutrition has always been reliable. The macros are accurate and the tub is easy to store.
2 weeks ago
One shake replaces two smaller meals. Saves time and I still hit my surplus every day.
2 weeks ago
Why serious lifters choose Optimum Nutrition Serious Mass
High-calorie formula built for athletes who need more than standard protein powders deliver
| Optimum Nutrition Serious Mass | Standard Protein Powders | |
|---|---|---|
| 1,250 calories per serving to create a true surplus | ✓ | ✗ |
| 50 g protein plus 252 g carbs in one shake | ✓ | ✗ |
| 8-serving tub supports consistent daily use | ✓ | ✗ |
| Trusted by lifters for decades with proven macros | ✓ | ✗ |
| Chocolate flavor that mixes smoothly without clumps | ✓ | ✗ |
Trusted by Serious Lifters for Decades
Optimum Nutrition Serious Mass delivers 1,250 calories per serving with the consistency dedicated athletes rely on for visible size gains.