---
title: "Mass Gainer — $472K/mo Amazon US Product Research (2026)"
canonical_url: "https://flapen.com/research/us/health-household/mass-gainer"
last_updated: "2026-08-12T14:04:01.191Z"
locale: en
meta:
description: "Amazon product research for mass gainer: $472K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for mass gainer: $472K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Mass Gainer — $472K/mo Amazon US Product Research (2026)"
---
# **Mass Gainer**
**Launch it**
A $5.7M/yr market growing +1.7% this quarter with returns at 0.0% — clears our launch bar.
Market size 98Growth 27Conversion 49Competition 36Returns 100Price range 95Avg price 92Brand share 13Review moat 22Quality gap 57
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Market size**
**Incredible****$5.7M**
$5.7M/yr · 2.7M searches
**Price range**
**Incredible****$23.31–$78.68**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Great****$54.04**
avg listing price — sweet spot $15–$100
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Okay****3.9%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Okay****63%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Okay****+1.7%**
90-day search growth — must beat 0% to launch
**Review moat**
**Bad****8,692.94**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Bad****95%**
top-5 brand share — brand-locked demand
**Signals**[** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
## **Is mass gainer profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, mass gainer is a $5.7M/yr Amazon United States market (2.7M searches/yr). The top 5 brands hold 95% of demand. Verdict: Launch it — 56/100.
Data updated Jul 17, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **mass gainer market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **80K–100K**
- avg 3,000–4,000/product
- **Revenue / yr**
- **$4.3M–$5.4M**
- units × avg price
- **Conversion rate**
- **3.9%**
- **Avg BSR**
- **#134**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **56%**
- **Out of stock**
- **10.5%**
- **Avg brand age**
- **73 months**
- **Avg seller age**
- **136 days**
## **Competition: brands, sellers & click share**
The top 5 products take 63% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**7 **▼falling
**Sellers**
**31**
**Top-5 brand share**
**95%**
Top 20: 100%
**Top-5 click share**
**63%**
Top 20: 100%
**Open market**
**2%**
- Optimum Nutrition46% - Dymatize31% - NAKED9% - Nutricost5% - Rule 1 Proteins4% - Mutant3% - Open — no brand owns it (1 brand, 2%)
## **mass gainer demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +1.7% search growth over the last 90 days.
60K40KSpike '24Prime Day '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/health-household/mass-gainer/trend)
## **Top mass gainer search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **mass gainer**1.1M/yr+7.0%2.8% conv. - **mass gainer protein powder**279K/yr-7.9%2.7% conv. - **weight gainer**231K/yr+6.1%1.4% conv. - **weight gainer men**224K/yr-3.1%2.1% conv. - **serious mass weight gainer**127K/yr+12.5%5.0% conv. - **serious mass**128K/yr-3.9%4.1% conv. - **mass**113K/yr-13.2%0.6% conv. - **weight gainer protein powder**71K/yr+9.5%1.8% conv. - **high calorie protein powder**58K/yr-1.6%1.3% conv. - **optimum nutrition serious mass**50K/yr+19.3%5.0% conv. [**All search terms **](https://flapen.com/research/us/health-household/mass-gainer/search-terms)
## **Top mass gainer products & what they sell for**
Every tracked product — its share of the shelf, its review moat, and what it sells for.
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$567K20%$1.1M30%$1.7M40%$2.3M101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 18 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Optimum Nutrition Serious Mass Weight Gainer Protein Powder Mass Gainer Vitamin C and Zinc for Immune Support Creatine Chocolate 6 Pound (Packaging May Vary)**Optimum Nutrition**$49.75**4.5★34,785 rev](https://www.amazon.com/dp/B0015R36SK) [2**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)**Dymatize**$40.99**4.5★9,328 rev](https://www.amazon.com/dp/B0020XQWCA) [3**Optimum Nutrition Serious Mass Weight Gainer Protein Powder Mass Gainer Vitamin C and Zinc for Immune Support Creatine Vanilla 6 Pound (Packaging May Vary)**Optimum Nutrition**$52.57**4.5★19,920 rev](https://www.amazon.com/dp/B0015R6ZPQ) [4**Optimum Nutrition Serious Mass Weight Gainer Protein Powder Mass Gainer Vitamin C and Zinc for Immune Support Creatine Chocolate 12 Pound (Packaging May Vary)**Optimum Nutrition**$74.69**4.5★34,785 rev](https://www.amazon.com/dp/B000GIPJ0M) [5**Dymatize Super Mass Gainer Protein Powder Gourmet Vanilla 52g Protein 1g Creatine 1280 Calories 10.7g BCAAs 245g Carbs Contains Whey Protein Isolate and Casein (16 Servings)**Dymatize**$68.23**4.5★9,328 rev](https://www.amazon.com/dp/B005GHHLH2)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Mutant Mass Extreme 2500 High Calorie Mass Gainer Whey Protein Powder for Muscle Building and Weight Gain Clean Calories with Whole Food Carbs - Triple Chocolate 2.2 lb**Mutant**$23.34**2,766 rev8mo ago](https://www.amazon.com/dp/B0FXBWFPKC) [**Nutricost Mass Gainer (Chocolate Peanut Butter Flavor 6.7 LBS) 50 Grams of Protein Per Serving - Non-GMO**Nutricost**$44.04**85 rev2y ago](https://www.amazon.com/dp/B0CR1WKQ19) [**Nutricost Mass Gainer Double Chocolate Flavor 7 LBS 50 Grams of Protein Per Serving - Non-GMO & Gluten Free**Nutricost**$44.07**136 rev2y ago](https://www.amazon.com/dp/B0CQPMW574) [**Rule 1 Proteins Mass Gainer Chocolate Fudge 8 Servings**Rule 1 Proteins**$32.14**144 rev3y ago](https://www.amazon.com/dp/B0BJMNLHWS) [**NAKED Vanilla Mass - All Natural Vanilla Weight Gainer Protein Powder - 8lb Bulk NSF Certified GMO Free Gluten Free & Soy Free No Artificial Ingredients - 1 260 Calories - 11 Servings**NAKED**$69.84**1,420 rev10y ago](https://www.amazon.com/dp/B01IO5TJZ4)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Nutricost Mass Gainer (Chocolate Peanut Butter Flavor 6.7 LBS) 50 Grams of Protein Per Serving - Non-GMO**Nutricost**$44.04**4.2★**▲ 156%**](https://www.amazon.com/dp/B0CR1WKQ19) [**NAKED Vanilla Mass - All Natural Vanilla Weight Gainer Protein Powder - 8lb Bulk NSF Certified GMO Free Gluten Free & Soy Free No Artificial Ingredients - 1 260 Calories - 11 Servings**NAKED**$69.84**4.1★**▲ 137%**](https://www.amazon.com/dp/B01IO5TJZ4) [**Mutant Mass Extreme 2500 High Calorie Mass Gainer Whey Protein Powder for Muscle Building and Weight Gain Clean Calories with Whole Food Carbs - Triple Chocolate 2.2 lb**Mutant**$23.34**4.4★**▲ 83%**](https://www.amazon.com/dp/B0FXBWFPKC) [**Rule 1 Proteins Mass Gainer Chocolate Fudge 8 Servings**Rule 1 Proteins**$32.14**4.4★**▲ 58%**](https://www.amazon.com/dp/B0BJMNLHWS) [**Dymatize Super Mass Gainer Protein Powder Gourmet Vanilla 52g Protein 1g Creatine 1280 Calories 10.7g BCAAs 245g Carbs Contains Whey Protein Isolate and Casein (16 Servings)**Dymatize**$68.23**4.5★**▲ 27%**](https://www.amazon.com/dp/B005GHHLH2)
**~~View all trending →~~**
## **What reviews say buyers love and hate about mass gainer**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Taste-Overall**24%
*“Good taste”*
**Weight Loss**12%
*“this really help me maintain the weight”*
**Nutritional Content**10%
*“I really love this protein”*
**Quality-Overall**9%
*“Decent enough”*
**Flavor**8%
*“Amazing flavor”*
**Weight Gain**7%
*“Does help you gain weight”*
**Value For Money**3%
*“Good deal”*
**Solubility**3%
*“Easy to mix”*
**Blend/Ratio**2%
*“Blends well”*
**Muscle Pain Relief**1%
*“support muscle growth”*
### **What buyers complain about **
**Taste-Overall**11%
*“Not for me - taste gross”*
**Value For Money**9%
*“Too expensive”*
**Nutritional Content**6%
*“I really disappointed in the powder u have to use to get a few calories”*
**Ingredients-Overall**4%
*“watch for the tricky deceitful added ingredients that are worthless and unhealthy to your body, like Maltodextrin”*
**Size-Overall**4%
*“I bought the wrong size”*
**Weight Loss**4%
*“This weight gainer is discusting”*
**Quality-Overall**3%
*“Full of garbage”*
**Sweetness**3%
*“chocolate is terrible”*
**Dosage**3%
*“7 scoops is not achievable”*
**Solubility**2%
*“does not dissolve well in water”*
## **Common mass gainer questions**
- **Is mass gainer profitable to sell on Amazon United States?**
- The niche generates $5.7M/yr across 18 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +1.7%. Flapen's verdict: Launch it (56/100).
- **How competitive is the mass gainer niche?**
- 7 brands and 31 sellers compete. The top 5 products take 63% of clicks and top 5 brands hold 95% of demand.
- **What do buyers complain about in mass gainer?**
- Top complaints mined from reviews: Taste-Overall, Value For Money, Nutritional Content. The return rate is 0.0%.
- **When does demand for mass gainer peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the mass gainer niche?**
- Listings span $23.31–$78.68; the average listing price is $54.04 (sweet spot $15–$100). The average incumbent carries 8,693 reviews — the moat a new listing must climb.
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