Rule 1 Proteins Mass Gainer – High-Calorie Weight Gain Formula with 1,220+ Calories, 250g+ Complex Carb Blend, 40g All-Whey Protein Per Serving (8 Servings, Strawberries & Crème)
Price: $34.99 - $32.99
(as of May 08, 2026 09:02:29 UTC – Details)
Product description
What is Rule 1 Mass Gainer?
Mass Gainer is a nutrient-dense formula that delivers over 1,220 calories, 250g of blended carbs, and 40g of all-whey protein in every serving.
When & how should I take Rule 1 Mass Gainer?
Use Mass Gainer longside regular meals—not as a replacement—to support your daily calorie goals. For best results, combine with a nutrient-dense diet and consistent resistance training.
How do I prepare Mass Gainer?
Mix 2 heaping scoops of Mass Gainer with 20–24 oz. of water, milk, or your favorite beverage in a blender or large shaker cup until smooth.
Is Rule 1 Mass Gainer tested for quality?
Yes. As an Informed Choice certified product, Mass Gainer is regularly tested for the presence of banned substances by world-class anti-doping laboratory LGC.
More About Rule One Proteins
Manufactured in the USA
As one of the few brands that actually crafts the advanced formulas it brings to market, Rule One Proteins has it’s own U.S. based manufacturing facility that uses only premium, globally sourced ingredients to produce a full lineup of protein & performance powders. This hands-on approach lets the brand control every step, minimize inefficiencies, and maximize quality—so every scoop can be trusted to be the very best it can be.
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Customer Reviews
4.5 out of 5 stars 36
4.7 out of 5 stars 33
4.6 out of 5 stars 359
4.5 out of 5 stars 70
4.6 out of 5 stars 75
4.2 out of 5 stars 18
4.6 out of 5 stars 79
Price
$32.99$32.99
$34.99$34.99
$104.99$104.99
$70.70$70.70
$44.99$44.99
$59.99$59.99
$44.99$44.99
Protein Sources
3 All-Whey Protein Sources
Whey & Milk Isolate, Casein
Whey Isolate & Hydrolyzed Whey
Whey Concentrate & Isolates
7 Premium Protein Sources
Micellar Casein
Clear Whey Isolate
Main Benefits
Maximum Weight Gain & Recovery
Weight Gain & Muscle Recovery
Pure & Fast Muscle Recovery
Fast-Acting Muscle Recovery
Daily Protein & Recovery
Overnight Muscle Recovery
Refreshing, Pure, Recovery
Protein per Serving
40g
30g
25g
24g
22g
25g
20g
Suggested Uses
After Workouts & Between Meals
After Workouts & Between Meals
Pre/Post-Workout or Snack
Pre/Post-Workout or Snack
Anytime – Day or Night
Before Bed
Intra/Post-Workout or Snack
Banned Substance Tested
✔
✔
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✔
✔
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Is Discontinued By Manufacturer : No
Product Dimensions : 8 x 8 x 11 inches; 6 Pounds
Item model number : RZ0437
Date First Available : October 18, 2022
Manufacturer : Rule One Proteins, LLC
ASIN : B0BJMNP8MT
Best Sellers Rank: #17,161 in Health & Household (See Top 100 in Health & Household) #10 in Sports Nutrition Weight Gainers
Customer Reviews: 4.3 4.3 out of 5 stars (64) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Serious Weight Gainer: With over 1,220 calories, more than 250g carbohydrates, and 40g protein from three types of whey, Mass Gainer puts you in charge of transforming to XXL
6:1 CARB-TO-PROTEIN RATIO – The 6:1 carb-to-protein ratio in this calorie-packed formula can help you pack on desired pounds.
All-Whey Protein: 40g of high-quality whey protein delivers 9 grams of naturally occurring BCAAs per serving.
Additional Features: Enhanced with pure creatine monohydrate.
Clean Manufacturing: R1 Mass Gainer is proudly made in our own state-of-the-art GMP certified facilities in the USA and produced clean, with no banned substances.
Directions: Mix two (2) scoops of Mass Gainer with approx. 18-20 oz. of water, milk or your favorite beverage in a shaker cup or glass for a delicious shake. Or add your favorite fruit and ice to the above, mix in blender and enjoy as a smoothie! Mass Gainer should be combined with a high-calorie diet and weight training or other high-intensity exercise. Use it in conjunction with the food you normally eat for additional daily calories. Do not use in place of meals.
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