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.

Mass Gainer

Launch it

A $5.7M/yr market growing +1.7% this quarter with returns at 0.0% — clears our launch bar.

Returns

Incredible0.0%

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

Good4.4★

avg incumbent rating — lower means beatable quality

Conversion

Okay3.9%

search→purchase rate — share of searches ending in a sale

Competition

Okay63%

top-5 click share — leaders hold, buyers still browse

Growth

Okay+1.7%

90-day search growth — must beat 0% to launch

Review moat

Bad8,692.94

avg incumbent reviews — the moat a new listing must climb

Brand share

Bad95%

top-5 brand share — brand-locked demand

Signals High Price

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

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

Top-5 brand share

95%

Top 20: 100%

Top-5 click share

63%

Top 20: 100%

Open market

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.

No pronounced peak months · busiest ÷ quietest = 1.3×

Open Trend

Top mass gainer search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

mass gainer1.1M/yr +7.0%2.8% conv.
mass gainer protein powder279K/yr -7.9%2.7% conv.
weight gainer231K/yr +6.1%1.4% conv.
weight gainer men224K/yr -3.1%2.1% conv.
serious mass weight gainer127K/yr +12.5%5.0% conv.
serious mass128K/yr -3.9%4.1% conv.
mass113K/yr -13.2%0.6% conv.
weight gainer protein powder71K/yr +9.5%1.8% conv.
high calorie protein powder58K/yr -1.6%1.3% conv.
optimum nutrition serious mass50K/yr +19.3%5.0% conv.

All 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.

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

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$49.754.5★34,785 rev

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$40.994.5★9,328 rev

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$52.574.5★19,920 rev

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$74.694.5★34,785 rev

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$68.234.5★9,328 rev

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$23.342,766 rev

8mo ago

Nutricost Mass Gainer (Chocolate Peanut Butter Flavor 6.7 LBS) 50 Grams of Protein Per Serving - Non-GMO

Nutricost$44.0485 rev

2y ago

Nutricost Mass Gainer Double Chocolate Flavor 7 LBS 50 Grams of Protein Per Serving - Non-GMO & Gluten Free

Nutricost$44.07136 rev

2y ago

Rule 1 Proteins Mass Gainer Chocolate Fudge 8 Servings

Rule 1 Proteins$32.14144 rev

3y ago

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$69.841,420 rev

10y ago

What reviews say buyers love and hate about mass gainer

What buyers praise and complain about, mined from review topics.

What buyers love

Taste-Overall24%

“Good taste”

Weight Loss12%

“this really help me maintain the weight”

Nutritional Content10%

“I really love this protein”

Quality-Overall9%

“Decent enough”

Flavor8%

“Amazing flavor”

Weight Gain7%

“Does help you gain weight”

Value For Money3%

“Good deal”

Solubility3%

“Easy to mix”

Blend/Ratio2%

“Blends well”

Muscle Pain Relief1%

“support muscle growth”

What buyers complain about

Taste-Overall11%

“Not for me - taste gross”

Value For Money9%

“Too expensive”

Nutritional Content6%

“I really disappointed in the powder u have to use to get a few calories”

Ingredients-Overall4%

“watch for the tricky deceitful added ingredients that are worthless and unhealthy to your body, like Maltodextrin”

Size-Overall4%

“I bought the wrong size”

Weight Loss4%

“This weight gainer is discusting”

Quality-Overall3%

“Full of garbage”

Sweetness3%

“chocolate is terrible”

Dosage3%

“7 scoops is not achievable”

Solubility2%

“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.