Is fiber supplement profitable to sell on Amazon United States?

The niche generates $15.3M/yr across 37 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is -7.2%. Flapen's verdict: Worth a look (66/100).

How competitive is the fiber supplement niche?

23 brands and 212 sellers compete. The top 5 products take 41% of clicks and top 5 brands hold 74% of demand.

What do buyers complain about in fiber supplement?

Top complaints mined from reviews: Taste-Overall, Functionality-Overall, Value For Money. The return rate is 0.0%.

When does demand for fiber supplement peak?

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

What does it cost to enter the fiber supplement niche?

Listings span $9.58–$58.04; the average listing price is $21.06 (sweet spot $15–$100). The average incumbent carries 10,151 reviews — the moat a new listing must climb.

fiber supplement

Worth a look

Shows a $15.3M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size

Incredible$15.3M

$15.3M/yr · 8.5M searches

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Avg price

Great$21.06

avg listing price — sweet spot $15–$100

Price range

Great$9.58–$58.04

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

Conversion

Great8.6%

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

Competition

Good41%

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

Brand share

Good74%

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

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Review moat

Bad10,151.49

avg incumbent reviews — the moat a new listing must climb

Growth

Bad-7.2%

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

According to Flapen's Amazon United States niche tracking, fiber supplement is a $15.3M/yr Amazon United States market (8.5M searches/yr). The top 5 brands hold 74% of demand. Verdict: Worth a look — 66/100.

Data updated Jul 25, 2026 · scored weekly · How we score niches

fiber supplement market data

Units sold / yr: 600K–800K; avg 20,000–25,000/product
Revenue / yr: $12.6M–$16.8M; units × avg price
Conversion rate: 8.6%
Avg BSR: #63
Page quality: 0%
Prime: 100%
Sponsored: 84%
Out of stock: 0.3%
Avg brand age: 68 months
Avg seller age: 136 days

Competition & brand share

The top 5 products take 41% of clicks — established leaders, but buyers still shop beyond them.

Brands

23 rising

Sellers

212

Top-5 brand share

74%

Top 20: 98%

Top-5 click share

41%

Top 20: 84%

Open market

22%

Metamucil35%
NOW Foods14%
Benefiber13%
Physician's CHOICE7%
Amazon Basics5%
MiraLAX3%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -7.2% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.6×

Open Trend

Top fiber supplement search terms

fiber supplement2.9M/yr -21.9%6.5% conv.
fiber2.2M/yr -6.0%5.5% conv.
fiber powder697K/yr +1.6%5.3% conv.
metamucil capsule429K/yr +4.0%15.9% conv.
fiber supplement for women350K/yr -5.3%5.4% conv.
fiber pills320K/yr +4.5%8.4% conv.
fiber capsules226K/yr -2.1%8.8% conv.
daily fiber supplement93K/yr +360.1%1.1% conv.
soluble fiber194K/yr -17.0%4.2% conv.
fibra para el estreimiento158K/yr +9.0%1.8% conv.

All search terms

Top fiber supplement 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 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Metamucil Psyllium Husk GLP-1 Friendly Fiber Capsules 300 Capsules 3-in-1 Fiber Supplement Daily Psyllium Husk Fiber Capsules Help Support Digestive Health by Promoting Regularity*

Metamucil$32.994.6★26,964 rev

NOW Foods Supplements Psyllium Husk Caps 500 mg Non-GMO Project Verified Natural Soluble Fiber Intestinal Health* 200 Veg Capsules

NOW Foods$10.494.6★31,631 rev

Metamucil 4-in-1 Psyllium Husk GLP-1 Friendly Fiber Supplement Sugar-Free 180 teaspoons Orange Flavored Daily Fiber Powder for Digestive Health made with Plant-Based Psyllium Husk Fiber

Metamucil$33.714.7★35,140 rev

Benefiber Daily Prebiotic GLP-1 Friendly Fiber Supplement Powder for Digestive Health Unflavored - 250 Teaspoons (17.6 Ounces)

Benefiber$21.934.7★9,314 rev

Metamucil Fiber Gummies for Adults No Sugar Added Orange Flavor 5g Prebiotic Plant Based Fiber Supplement Blend 120 Count

Metamucil$23.704.6★17,254 rev

Newest

by launch date

Physicians CHOICE Fiber Gummies for GLP-1 Support - No Sugar Added & Vegan - Raspberry Lemon - Natural Chicory Root Prebiotic Fiber Gummy - Digestive Health & Regularity for Women & Men - 60CT

Physician's CHOICE$15.351,700 rev

8mo ago

Physicians CHOICE Easy Mix Fiber for GLP-1 Support - No Grit & Sugar Free - Daily Prebiotic Soluble Fiber Powder Supplement - Digestive Health & Regularity - for Women and Men - Unflavored - 7.1oz

Physician's CHOICE$21.531,689 rev

9mo ago

Metamucil 3-in-1 Fiber Capsules Daily Psyllium Husk Fiber Supplement for Digestive Health Plant Based Fiber Supplement 340 Capsules (Pack of 1)

Metamucil$58.04131 rev

1y ago

Metamucil Fiber Supplement Unflavored Clear Mixing Powder No Grit No Sugar Added Plant Based Prebiotic Fiber Supplement Blend for Daily Digestive Health 75 teaspoons

Metamucil$23.572,401 rev

2y ago

Metamucil Fiber Gummies for Adults with Probiotics for Bloating Relief No Sugar Added Strawberry Kiwi BlackBerry Flavors 5g Prebiotic Plant Based Fiber Supplement Blend 90 Count

Metamucil$31.573,452 rev

2y ago

What buyers say about fiber supplement

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

What buyers love

Taste-Overall16%

“no nasty taste”

Quality-Overall10%

“The capsules are a good quality”

Efficiency8%

“Works Well”

Nutritional Content6%

“Good supplement”

Regulates Digestion6%

“Easy on your stomach”

Value For Money5%

“Fair price”

Advertised Vs Actual Product5%

“As Described”

Solubility5%

“Dissolves easily”

Ease Of Use4%

“Easy to get down”

Flavor4%

“Good orange flavor”

What buyers complain about

Taste-Overall12%

“Disgusting taste”

Functionality-Overall11%

“No result”

Value For Money5%

“A little expensive”

Ease Of Chewing/Swallowing4%

“Difficult to chew”

Dosage4%

“The recommended dosage was way too much for me”

Nutritional Content3%

“I cant believe I didnt double check the nutrition label”

Regulates Digestion3%

“Not sure how much they help with digestion”

Acid Regulator/Stomach Ache Relief3%

“Major bloating”

Solubility3%

“Dissolving issues”

Flavor3%

“Strange flavor”

Top return reasons

Functionality-Overall16%

Dosage12%

Advertised Vs Actual Product11%

Taste-Overall7%

Value For Money6%

Ingredients-Overall5%