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💥 Bulk smarter, not harder — fuel your next-level gains!
AMP Mass XXX is a clinically proven weight gainer protein powder delivering 780 calories and 50g of whey protein per serving. Featuring advanced MyoTOR and BETAPOWER ingredients, it supports rapid strength, size, and stamina improvements within 2 weeks. Tested against 220+ banned substances, this 6-pound strawberry-flavored formula offers 13 servings designed for efficient muscle growth and recovery.
| ASIN | B091XY12FL |
| ASIN | B091XY12FL |
| Age Range Description | Adult |
| Best Sellers Rank | #59,227 in Health & Household ( See Top 100 in Health & Household ) #41 in Sports Nutrition Weight Gainers |
| Brand Name | GNC |
| Customer Reviews | 4.4 4.4 out of 5 stars (56) |
| Date First Available | December 4, 2025 |
| Flavor | Strawberry |
| Item Dimensions | 1 x 8 x 10.42 inches |
| Manufacturer | GNC |
| Manufacturer | GNC |
| Manufacturer Part Number | 123406 |
| Number of Items | 1 |
| Package Type Name | Canister |
| Product Benefits | Supports overall health and wellness |
| Product Dimensions | 1 x 8 x 10.42 inches; 6.66 Pounds |
| Protein Source | Whey |
| Recommended Uses For Product | Supports overall health and wellness |
| Total Servings Per Container | 13 |
| UPC | 048107213756 |
| Unit Count | 96.1 Ounce |
R**Z
I recommend them to eveyone
Very good opinion peaple who go to the or don’t keep body great positivity day
J**E
Maybe not be worth it
Great taste but no noticeable gains after 3 months
M**X
Protein shake
Great product. Started seeing results in 3 weeks. Does have a lot of calories. Everything you need to bulk up fast.
L**N
Very nice
If you’re looking for the sales from GNC this actually comes straight from GNC.
S**E
Does what it says it does but feels more like its made for post workout
Feels more like for a post workout
T**S
Protein
High quality!!
T**R
skin breakout+too expensive relative to results
something about gnc products break me out now. back in 2015-2016 timeframe i used wheybolic with great results. tried wheybolic in 2022 and broke out like a teenager. tried gnc serious mass and after 4 days im noticing the same breakout again. this time my diet is much cleaner which clearly point to this product. on the flip side i can feel the results in the sense of the soreness going away but I don’t have the mass gain as i do with serious on mass(which is $20 cheaper and has more nutrients).
A**.
Red 40
Would be a 5 star if they removed the Red 40 dye.
Trustpilot
2 weeks ago
1 month ago