Serious Mass Weight Gainer Market Report: Sales Volume, Market Share, Leading Brands & Market Trends
Serious Mass Weight Gainer sales on Amazon US totaled 261,100 units in July 2026 (▼ 5.6% vs. the prior month), generating an estimated $9,587,169 in revenue across the 50 top-ranked ASINs for this search term. Demand is heavily concentrated at the top of the ranking — the ten best performers capture 66.6% of unit volume and 57.5% of revenue, while a typical listing is priced at $53.34. The keyword itself pulled 17,071 Amazon queries over the same period (▲ 6.3% MoM).
Zooming out to the 12-month window ending July 2026, the serious mass weight gainer Top 50 moved 2,420,150 units and $90,075,106 in cumulative sales — an average of 201,679 units and $7,506,259 per month. Monthly throughput topped out at 276,600 units in June 2026 and dipped to 132,850 in May 2026, leaving the latest reading 48.8% higher than August 2025.
Serious Mass Weight Gainer Sales Trend (Trailing 12 Months)
Based on the top 50 ASINs by monthly sales for this keyword
2025/08
2025/09
2025/10
2025/11
2025/12
2026/01
2026/02
2026/03
2026/04
2026/05
2026/06
2026/07
Monthly Sales 2026/07
261.1K
▼ 5.6% MoM
Monthly Revenue 2026/07
$9.6M
▼ 8.0% MoM
Top 10 Market Share 2026/07
66.6%
Serious Mass Weight Gainer Market Share & Sales Concentration on Amazon US — July 2026
The most-sold serious mass weight gainer listing on Amazon US in July 2026 is ASIN B002DYIZEE (Brand: Optimum Nutrition), which sold 80,000 units at $15.29 apiece — equal to 30.6% of every unit tracked in this report and 4.0× the volume of the No. 2 listing.
The Top 10 ASINs account for 174,000 units and $5,516,480 in July 2026 — 66.6% of unit volume and 57.5% of revenue among all 50 ranked ASINs in this report.
Sales Volume of Top ASINs for 'Serious Mass Weight Gainer' on Amazon
July 2026
Is 66.6% Top 10 share highly concentrated?
Ask AI to evaluate competition, market structure, and entry opportunities using ’s tracked Amazon sales, ranking, and keyword data.
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Top 5 Volume Share breakdown
B002DYIZEE
Optimum Nutrition Creatine Monohydrate Powder, Unflavored, 10 Oz | 5g Micronized Creatine Monohydrate Powder Per Serving, Supports Muscle Strength & Power, Easy Mixing, Banned Substance Tested
80K
▲ 14.3%vs. prior month
$1.3M
latest month
12-month trend
B0CQ3JTR6F
Transparent Labs Grass-Fed Whey Protein - 30 Servings, French Vanilla | Naturally Flavored, Gluten Free Whey Protein Powder with 28g of Protein per Serving & 9 Amino Acids
20K
▲ 0.0%vs. prior month
$1.2M
latest month
12-month trend
B00IUHNCIW
MuscleTech Creatine Monohydrate Powder, Platinum Pure (80 Servings) | Unflavored Micronized Creatine for Men & Women - Workout Supplements for Performance & Muscle Recovery - Packaging May Vary
10K
▲ 0.0%vs. prior month
$197.1K
latest month
12-month trend
B00XIKPUK4
NAKED Whey 2LB 100% Grass Fed Whey Protein Powder - Only 1 Ingredient, Unflavored Whey Protein, NSF Certified, Undenatured, Gluten Free, Soy Free, No GMOs, No Preservatives
10K
▲ 0.0%vs. prior month
$449.9K
latest month
12-month trend
B0B1HJL9QK
BOOST Very High Calorie Nutritional Drink, Chocolate, 8 Fl Oz, 24 pk | Helps Weight Gain & Maintenance - 530 Calories - 26 Vitamins & Minerals - 22g Protein - Calorie-Dense Nutritional Drink
10K
▲ 0.0%vs. prior month
$628.6K
latest month
12-month trend
B0DX7846R5
HEARTHY FOODS Creatine Monohydrate Micronized Powder 500G - 100 Servings, 5000mg Per Serving (5g) - for Men & Women Muscle Growth & Recovery - UNFLAVORED
10K
▲ 0.0%vs. prior month
$109.9K
latest month
12-month trend
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Best Serious Mass Weight Gainer Brands on Amazon US — Top 3 Brand Sales Concentration (July 2026)
Optimum Nutrition is the best-performing serious mass weight gainer brand in July 2026, moving 80,000 units across 1 ASIN for 46.0% of Top 10 volume. Transparent Labs follows with 20,000 units (11.5%), ahead of BOOST on 17,000 units (9.8%).
With 9 brands splitting the Top 10 and 67.2% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $15.29 to $60.58, which frames the price band a competing listing has to justify.
Brand share of Top 10 volume
Optimum Nutrition
1 ASIN in Top 10
46.0%
Units
80K
Revenue
$1.3M
Avg. price
$15.29
B002DYIZEE
$15.29·★4.6·78.5K revsOptimum Nutrition Creatine Monohydrate Powder, Unflavored, 10 Oz | 5g Micronized Creatine Monohydrate Powder Per Serving, Supports Muscle Strength & Power, Easy Mixing, Banned Substance Tested
Units sold80K
Transparent Labs
1 ASIN in Top 10
11.5%
Units
20K
Revenue
$1.2M
Avg. price
$59.99
B0CQ3JTR6F
$59.99·★4.5·1.8K revsTransparent Labs Grass-Fed Whey Protein - 30 Servings, French Vanilla | Naturally Flavored, Gluten Free Whey Protein Powder with 28g of Protein per Serving & 9 Amino Acids
Units sold20K
BOOST
2 ASINs in Top 10
9.8%
Units
17K
Revenue
$1M
Avg. price
$60.58
B0B1HJL9QK
$62.15·★4.5·3.6K revsBOOST Very High Calorie Nutritional Drink, Chocolate, 8 Fl Oz, 24 pk | Helps Weight Gain & Maintenance - 530 Calories - 26 Vitamins & Minerals - 22g Protein - Calorie-Dense Nutritional Drink
Units sold10KB07T3KYH4N
$59.00·★4.6·3.9K revsBOOST Very High Calorie Nutritional Drink, Creamy Strawberry, 8 Fl Oz, 24pk | Supports Weight Gain & Maintenance, 22 g Protein
Units sold7K
Trending Serious Mass Weight Gainer Products — Growth Leaders & New Top 10 Entrants
Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, 2 ASINs forced its way in: B0020XQWCA booked 9K units at $39.98, with ▲ 0.0% MoM change. On the growth side, B07CZTHCXQ leads positive momentum with ▲ 166.7% MoM growth on 800 units.
The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.
B0020XQWCA
Dymatize Super Mass Gainer Protein Powder, Gourmet Vanilla, 52g Protein, 1g Creatine, 1280 Calories, 10.7g BCAAs, 245g Carbs, Contains Whey Protein Powder, Isolate, and Casein (8 Servings)
Price
$39.98
Rating
4.5
Reviews
9.5K
Latest month sales
B07T3KYH4N
BOOST Very High Calorie Nutritional Drink, Creamy Strawberry, 8 Fl Oz, 24pk | Supports Weight Gain & Maintenance, 22 g Protein
Price
$59.00
Rating
4.6
Reviews
3.9K
Latest month sales
B07CZTHCXQ
Appetite Booster Weight Gain Stimulant Supplement Eat More for Underweight Adults & Kids 4+ Fortified with Vitamins B1,B2,B3,B5,B6,B12, Folic Acid, Iron, Zinc, Amino Acids, Flax Seed Oil
Unlock to view ASIN details and product titles
Price
$26.09
Rating
3.9
Reviews
5.5K
Latest month sales
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