Pack on lean muscle mass, boost strength, and fuel recovery with Serious ON Mass, the ultimate weight gainer for hardgainers and athletes looking to increase size and performance. This high-calorie mass gainer provides over 1,250 calories, 50g of premium protein, and complex carbohydrates per serving, making it the perfect post-workout or meal replacement shake for serious muscle building results.
Designed with fast and slow-digesting proteins, essential vitamins, and muscle-fueling carbs, Serious ON Mass helps you maximize muscle growth, optimize recovery, and support intense training sessions.
Why Choose Serious ON Mass?
✔ 1,250+ Calories Per Serving – High-calorie formula for muscle mass and strength gains. ✔ 50g of High-Quality Protein – Supports muscle recovery and lean mass development. ✔ 250+g of Complex Carbohydrates – Fuels workouts, replenishes glycogen, and boosts endurance. ✔ Loaded with Essential Nutrients – Includes BCAAs, glutamine, and vitamins for optimal growth. ✔ Tastes Great & Mixes Easily – Delicious flavors with a smooth, creamy texture.
How to Use Serious ON Mass
Post-Workout: Take 1 serving mixed with 24 oz of water or milk for fast muscle recovery.
Between Meals: Use as a high-calorie meal replacement to support weight gain.
Before Bed: Consume before sleep to fuel overnight muscle repair.
Nutrition Info
Product Weight: 3.5 lb
Warning Concerning California Residents: This product may contain chemicals known to the State of California to cause cancer and birth defects or reproductive harm.
Customer Reviews
Overall rating: 4.8 / 5 from 41 reviews.
I got this for my husband. It smells great and he said it tastes good. Definitely helps him get in extra calories.
My experience with Serious Mass has been nothing but great. Constantly pushing my body to the limits requires some serious fuel to rebuild it, & Serious Mass is getting the job done for me.
Great product. I liked the taste and the nutrition facts speak for themselves, but it's tough when it only has 8 servings per container (16 if you split it). But overall I'd still rate 5 stars because it's helping me reach my weight goals.
Overall the taste is good and for the price you get a good size tub of weightgainer. A couple minor gripes is that the scoop size is not like your
Typical scoop—it’s like a shovel. Won’t easily fit into most shaker cups which makes
For some tricky, awkward mixing. Also the powder is so fine that the slightest sharp movement will result in powder all over yourself! All in all it tastes good; not the best for easy quick mixing but the price is pretty fair for the quantity. Worth trying once
I got the banana flavor and I didn’t mind the taste. I mix one scoop with water and will take another scoop later in the day. Super easy way to pack on the calories. Plus, it isn’t chalked full of sugar. The only bad thing is the price, but you get what you pay for I guess.
I'm not sure if its just my body but ever since I've been taking this protein I'm actually losing weight. But i do look a little more cut then i once did, probably form the protein intake. i wouldn't recommend this product to any one else
Can’t complain about the product. It’s pretty good and I see it working after a few weeks of trying it. Seeing my muscles bulk up more and gaining some calories. Would recommend!
I love it and it came in so quick, they gave me an offer I couldnt refuse! Two of the Optium Nutrition Serious Mass and three free items !! The items were a shirt, pill case, and a shaker. Not to mention my package came quick. 10/10, definitely buying again from tiger fitness. P.S. the logo on the package was cool lol
This mass gainer is really great, I've gained 20lbs using it but the thing you need to understand if you're going to buy this is that you cant drink this alone to gain weight. The way to gain weight is to eat more not drink this several times a day and not eat. This should just be a additive, like for me I use it before I go to sleep because I burn too many calories in my sleep. I eat about 3500 calories just in food and then drink this right before I sleep to give me an extra 1250 calories for the day. The only flavor I like is just pure chocolate, I cant drink the others consistently, but for this price and the amount of calories is great. Also the ratio to sugars and protein is incredible, usually with mass gainers they are pretty close which isn't good for you.
I love this mass gainer. It tastes really good and it is best with water. It has helped me put on a lot of muscle and minimal fat. This is a must buy and I would recommend this to anybody trying to bulk, for it makes reaching above your maintenance calories very easy.
I usually get serious mass protein due to it being 250G of Carbohydrates with NO ADDED SUGAR! 1,250 Calories! + flavor is nothing compared to other weight gainers. was my very first protein powder loved it ever since.
I was kinda skeptical when it comes to flavor and taste, the chocolate flavor is awesome, thought I was gonna get tired of it but instead continued without feeling irritated. The best part of it is the result, you know its real when you look at yourself, then you end up smiling.
Great taste and mix-ability. I only use half a scoop and fill in the rest of my calories with whole foods. Doesn't cook well so I just recommend this used for a shake. Taste great with Oatmeal too!
