Is glucomannan profitable to sell on Amazon United States?

The niche generates $599K/yr across 12 tracked products. 90-day search growth is -9.1%. Flapen's verdict: Worth a look (54/100).

How competitive is the glucomannan niche?

9 brands and 26 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 89% of demand.

What do buyers complain about in glucomannan?

Top complaints mined from reviews: Functionality-Overall, Nutritional Content, Weight Loss. The return rate is 0.0%.

When does demand for glucomannan peak?

Demand is steady year-round — the busiest month runs 1.6× the quietest.

What does it cost to enter the glucomannan niche?

Listings span $9.92–$26.64; the average listing price is $17.31 (sweet spot $15–$100). The average incumbent carries 1,988 reviews — the moat a new listing must climb.

glucomannan

Worth a look

Shows low returns (0.0%), but a concentrated shelf (top 5 take 81% of clicks) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Quality gap

Great4.2★

avg incumbent rating — lower means beatable quality

Avg price

Great$17.31

avg listing price — sweet spot $15–$100

Conversion

Great8.1%

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

Price range

Good$9.92–$26.64

cheapest to priciest tracked listing — scored on the share inside $15–$100

Market size

Good$599K

$599K/yr · 426K searches

Review moat

Okay1,987.5

avg incumbent reviews — the moat a new listing must climb

Brand share

Okay89%

top-5 brand share — brands hold most of the demand

Growth

Bad-9.1%

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

Competition

Bad81%

top-5 click share — a locked-up shelf

According to Flapen's Amazon United States niche tracking, glucomannan is a $599K/yr Amazon United States market (426K searches/yr). The top 5 brands hold 89% of demand. Verdict: Worth a look — 54/100.

Data updated Jul 10, 2026 · scored weekly · How we score niches

glucomannan market data

Units sold / yr: 40K–50K; avg 3,000–4,000/product
Revenue / yr: $692K–$866K; units × avg price
Conversion rate: 8.1%
Avg BSR: #628
Page quality: 0%
Prime: 100%
Sponsored: 67%
Out of stock: 0.0%
Avg brand age: 64 months
Avg seller age: 159 days

Competition & brand share

The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.

Brands

9 flat

Sellers

Top-5 brand share

89%

Top 20: 100%

Top-5 click share

81%

Top 20: 100%

Open market

Nutricost35%
NOW Foods33%
BulkSupplements8%
Nature's Way7%
Brieofood5%
Best Naturals4%
Open — no brand owns it (3 brands, 7%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -9.1% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.6×

Open Trend

Top glucomannan search terms

glucomannan266K/yr -12.4%9.9% conv.
glucomannan for weight loss51K/yr +6.9%7.7% conv.
glucomannan capsules35K/yr -16.5%11.7% conv.
glucomanano14K/yr +20.0%2.2% conv.
now glucomannan8K/yr +9.1%19.2% conv.
glucomanano para bajar de peso6K/yr +9.1%2.3% conv.
now foods glucomannan5K/yr +23.4%15.3% conv.
konjac glucomannan9K/yr -13.3%9.3% conv.
glucomannan supplements7K/yr -35.6%7.0% conv.
nutricost glucomannan capsules2K/yr +154.3%19.6% conv.

All search terms

Top glucomannan products on Amazon

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 12 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Nutricost Glucomannan 1 800mg Per Serving 180 Capsules - Natural Fiber Source Non-GMO Gluten Free

Nutricost$16.824.1★4,976 rev

NOW Foods Supplements Glucomannan (Amorphophallus konjac) 575 mg Supports Regularity* Healthy Weight Management* 180 Veg Capsules

NOW Foods$14.634.2★3,871 rev

NOW Foods Supplements Glucomannan (Amorphophallus konjac) Pure Powder Supports Regularity* Healthy Weight Management* 8 Ounce (Pack of 1)

NOW Foods$14.044.3★4,985 rev

BulkSupplements.com Glucomannan Capsules - as Konjac Root Extract Glucomannan Supplements Herbal Supplement - Gluten Free 4 Capsules per Serving 240 Count (Pack of 1)

BulkSupplements$22.834.4★171 rev

Natures Way Herbal Glucomannan from Konjac Root Capsules Promotes Feelings of Fullness* 1 995 mg per 3-Capsule Serving Non-GMO Project Verified Vegan 100 Capsules (Packaging May Vary)

Nature's Way$12.034.0★4,173 rev

Newest

by launch date

Clean Nutra Berberine and Ceylon Cinnamon Supplement Bitter Melon Glucomannan Gymnema Sylvestre Chromium Moringa Milk Thistle Turmeric Apple Cider Vinegar Digestive Enzymes Inositol Pills 90 Capsules

Clean Nutraceuticals$26.64337 rev

1y ago

Type Zero Clean Glucomannan Konjac Root Extract (90 Capsules)(1 800 MG Per Serving) - 30 Servings Non-GMO Gluten Free

Type Zero$14.7064 rev

2y ago

BulkSupplements.com Glucomannan Capsules - as Konjac Root Extract Glucomannan Supplements Herbal Supplement - Gluten Free 4 Capsules per Serving 240 Count (Pack of 1)

BulkSupplements$22.83171 rev

3y ago

Brieofood Konjac Root Glucomannan 2000 mg per Serving - 180 Vegetarian Capsules

Brieofood$9.92411 rev

3y ago

Best Naturals 2 Pack Konjac Glucomannan Root 2000 mg per Serving - 180 Vegetarian Capsules

Best Naturals$21.30415 rev

4y ago

What buyers say about glucomannan

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

What buyers love

Quality-Overall17%

“The quality is consistent”

Weight Loss12%

“Great for weight loss”

Nutritional Content10%

“Awesome, healthy and perfect in every way”

Regulates Digestion8%

“it helps a lot with constipation”

Value For Money5%

“Worth every penny”

Efficiency5%

“Effective”

Advertised Vs Actual Product5%

“Works as advertised”

Acid Regulator/Stomach Ache Relief4%

“So far this is easy to stomach”

Vitamin3%

“An excellent supplement”

Strength3%

“Super strong”

What buyers complain about

Functionality-Overall19%

“Didn't work”

Nutritional Content9%

“Didnt even suppress appetite as claimed”

Weight Loss7%

“It didnt fill me up or help with my appetite at all”

Dosage6%

“which is crazy 4 pills at 1 time per day”

Solubility6%

“Doesn't dissolve”

Acid Regulator/Stomach Ache Relief5%

“just made my stomach hurt”

Regulates Digestion5%

“caused digestion problems even though I made sure to drink plenty of water”

Quality-Overall4%

“Not reliable product”

Value For Money3%

“is expensive”

Blood Sugar Level3%

“just not this in quantity they do really good for my blood sugar”

Top return reasons

Acid Regulator/Stomach Ache Relief40%

Smell20%

Joint Pain20%

Functionality-Overall20%

Common questions

Is glucomannan profitable to sell on Amazon United States?: The niche generates $599K/yr across 12 tracked products. 90-day search growth is -9.1%. Flapen's verdict: Worth a look (54/100).
How competitive is the glucomannan niche?: 9 brands and 26 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 89% of demand.
What do buyers complain about in glucomannan?: Top complaints mined from reviews: Functionality-Overall, Nutritional Content, Weight Loss. The return rate is 0.0%.
When does demand for glucomannan peak?: Demand is steady year-round — the busiest month runs 1.6× the quietest.
What does it cost to enter the glucomannan niche?: Listings span $9.92–$26.64; the average listing price is $17.31 (sweet spot $15–$100). The average incumbent carries 1,988 reviews — the moat a new listing must climb.