Signature Mass Gainer is a simple – and clean – way to go from skinny to stacked. It’s fully stocked with 810 calories, 50 grams of muscle-building protein, and 133 grams of carbohydrates. Probiotics help your body utilize the protein to its fullest. So, if you can’t seem to get enough mass-making nutrition in your day, skip the drive-thru and have a rich, satisfying shake.*
-Support Muscle Growth to Put on Mass*
-Premium Mass Gainer for Clean Bulking*
-50g of Muscle-Building Protein*
-Probiotics to Improve Digestive Health*
-Ideal for Post-Workout to Support Muscle Recovery and Growth*
We’ve put together a killer blend of high-quality protein sources to provide key muscle-building amino acids. The majority of the protein comes from clean, fast-digesting whey protein isolate. Milk protein concentrate and whey protein concentrate boast high bioavailability and supreme amino acid profiles. Casein rounds out the dairy proteins, providing a slow release of amino acids that supports muscles for hours. Carbohydrates are key for a mass-gaining diet. They provide your muscles and liver with the fuel you need to lift big and train hard. Maltodextrin provides fast-digesting carbohydrates while ModCarb and Cluster Dextrin provide slower-releasing carbs that have less of an impact on blood glucose levels.* Remember: Fat is not the enemy! It’s a valuable tool for clean bulking. Our bodies need some fat to produce hormones, build cell walls, absorb fat-soluble vitamins, construct neurons, and carry out many other important functions. This formula packs a serious caloric punch so the probiotics in our Signature Mass Gainer have been developed specifically for use in powder supplements. When you’re on a mass-gaining diet, a little digestive health support goes a long way. And, of course, protein absorption is crucial to making lean muscle gains.*















John Carter –
Great product for bulking! I’ve gained noticeable mass in just a few weeks. Mixes well and tastes good too.
Sarah Miller –
This mass gainer is a lifesaver for someone with a fast metabolism like me. It’s helped me pack on lean muscle without feeling bloated.
Michael Brown –
Solid product, but the servings are a bit large. I’d prefer smaller options for easier consumption.
Emily Davis –
Tastes amazing and gives me the extra calories I need to meet my fitness goals. Highly recommend!
David Wilson –
Works well for weight gain, but the texture could be smoother. Sometimes it feels a bit grainy.
Jessica Taylor –
I’ve tried several mass gainers, and this one is by far the best. It’s easy to digest and doesn’t upset my stomach.
Daniel Martinez –
Decent product, but it’s pricey compared to other options. The results are good, though.
Laura Anderson –
I love the variety of flavors available. It makes it easier to stick to my bulking plan without getting bored.
Chris Thomas –
Not a fan of the aftertaste, but it does the job in terms of adding mass and improving recovery.
Amy Jackson –
This product has helped me gain weight and muscle faster than expected. Definitely worth the investment.
Mark Harris –
Good quality, but it’s hard to mix without a blender. Clumps a bit when using just a shaker bottle.
Michelle Clark –
Fantastic results so far! I’ve noticed a significant increase in my strength and size since starting this mass gainer.
John Peterson –
I’ve been using the Bodybuilding.com Signature Mass Gainer for a few months now, and I’m really impressed with the results. It mixes easily, tastes great, and has helped me pack on lean muscle without unnecessary fat. Highly recommend it to anyone looking to bulk up!
Ryan Lewis –
It’s effective, but the calorie count is a bit lower than I’d like for a mass gainer. Still, it’s a solid choice.
John Doe –
I’ve been using the Bodybuilding.com Signature Mass Gainer for a month now, and I’m really impressed with the results. It mixes well, tastes great, and has helped me gain lean muscle mass without excessive fat. Highly recommend it for anyone looking to bulk up!
Olivia Walker –
I’ve been using this for a month and have seen great progress. The vanilla flavor is my favorite!
Jane Smith –
This mass gainer has been a game-changer for me. The calorie content is perfect for my goals, and it’s easy to digest. Plus, the chocolate flavor is delicious. I’ve already noticed a significant increase in my strength and size.
Mike Johnson –
I was skeptical at first, but this product has exceeded my expectations. It’s packed with quality ingredients and doesn’t leave me feeling bloated like some other gainers I’ve tried. Definitely worth the investment.
Emily Carter –
This mass gainer is a game-changer! The calorie content is perfect for my bulking phase, and I love that it includes a good balance of protein, carbs, and fats. The chocolate flavor is delicious, and I’ve noticed significant gains in my strength and size.
Mike Johnson –
I’ve tried several mass gainers, but the Bodybuilding.com Signature Mass Gainer stands out. It’s not overly sweet, blends smoothly, and doesn’t leave me feeling bloated. It’s helped me meet my caloric goals consistently. Great product!
Emily Davis –
The Bodybuilding.com Signature Mass Gainer has been a great addition to my fitness routine. It’s helped me meet my calorie goals without having to eat huge meals. The vanilla flavor is my favorite, and it blends smoothly with water or milk.
Sarah Lee –
As a female lifter, I was hesitant to try a mass gainer, but this one is perfect. It’s not too heavy, and it’s helped me build muscle without feeling like I’m gaining unnecessary weight. The vanilla flavor is my favorite—so tasty!
Daniel Brown –
The Bodybuilding.com Signature Mass Gainer is a solid product. It’s affordable compared to other brands, and the quality is top-notch. I’ve gained noticeable muscle mass since I started using it, and I’ll definitely keep it in my routine.
Chris Brown –
I’ve tried several mass gainers, and this one stands out. The macros are perfectly balanced, and it’s great for post-workout recovery. I’ve gained noticeable muscle mass in just a few weeks. Highly recommend!
John Doe –
I’ve been using Bodybuilding.com Signature Mass Gainer for a few weeks now, and I’m really impressed with the results. It’s easy to mix, tastes great, and has helped me pack on some serious muscle mass. Highly recommend it for anyone looking to bulk up!
John Doe –
Bodybuilding.com Signature Mass Gainer has been a game-changer for my bulking journey. The high calorie content and great mix of carbs and protein helped me gain weight steadily. The flavors are delicious, and it mixes easily without clumping. Highly recommend for anyone looking to pack on mass!
Jane Smith –
This mass gainer is a game-changer! It’s packed with calories and protein, which is exactly what I need to meet my daily intake goals. The flavor is delicious, and it doesn’t leave me feeling bloated like some other products I’ve tried.
Mike Johnson –
I’ve tried several mass gainers, but this one stands out. It’s packed with nutrients and doesn’t leave me feeling bloated like others. The taste is fantastic, and I’ve seen noticeable muscle growth since I started using it. Great product!
Mike Johnson –
I was skeptical at first, but Bodybuilding.com Signature Mass Gainer has exceeded my expectations. It’s helped me gain weight and muscle without feeling sluggish. The price is also very reasonable compared to other brands.
Sarah Thompson –
This mass gainer is perfect for my fitness goals. It’s easy to incorporate into my daily routine, and I love the variety of flavors. I’ve gained lean muscle without adding too much fat. Definitely worth the investment.
Alex Rivera –
Bodybuilding.com Signature Mass Gainer works well for me. It’s a bit pricey, but the quality justifies the cost. I’ve seen improvements in my strength and size over the past few months. The only downside is that it’s a little thick, but I mix it with extra water to solve that.
Emily Carter –
I’m impressed with this mass gainer. It provides the calories and protein I need without upsetting my stomach. The flavor options are great, and it mixes smoothly. I’ve gained weight in a healthy way since starting this product.
Sarah Lee –
I love how this mass gainer is formulated with high-quality ingredients. It’s been a great addition to my post-workout routine, and I’ve noticed a significant improvement in my recovery time. The only downside is that it can be a bit sweet for my taste.
Chris Brown –
Bodybuilding.com Signature Mass Gainer is a solid product. It’s helped me meet my calorie goals and has contributed to my muscle growth. However, I wish it had a bit more variety in flavors.