Is l glutamine capsules profitable to sell on Amazon United States?

The niche generates $32K/yr across 20 tracked products. 90-day search growth is +3.5%. Flapen's verdict: Worth a look (53/100).

How competitive is the l glutamine capsules niche?

16 brands and 97 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 64% of demand.

What do buyers complain about in l glutamine capsules?

Top complaints mined from reviews: Dosage, Functionality-Overall, Ingredients-Overall. The return rate is 0.0%.

When does demand for l glutamine capsules peak?

Demand is steady year-round — the busiest month runs 2.4× the quietest.

What does it cost to enter the l glutamine capsules niche?

Listings span $9.35–$63.78; the average listing price is $20.22 (sweet spot $15–$100). The average incumbent carries 2,196 reviews — the moat a new listing must climb.

L Glutamine Capsules

Worth a look

Shows searches that convert (22.3% search→purchase), but a small market ($32K/yr) keeps it on the watch list.

Conversion

Incredible22.3%

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

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Avg price

Great$20.22

avg listing price — sweet spot $15–$100

Price range

Great$9.35–$63.78

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

Brand share

Good64%

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

Competition

Okay57%

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

Review moat

Okay2,196

avg incumbent reviews — the moat a new listing must climb

Growth

Okay+3.5%

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

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Market size

Bad$32K

$32K/yr · 7K searches

Is l glutamine capsules profitable on Amazon?

According to Flapen's Amazon United States niche tracking, l glutamine capsules is a $32K/yr Amazon United States market (7K searches/yr). The top 5 brands hold 64% of demand. Verdict: Worth a look — 53/100.

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

l glutamine capsules market size & sales

Units sold, revenue, conversion and listing quality across the tracked shelf.

Units sold / yr: 1K–1K; avg 0–100/product
Revenue / yr: $20K–$25K; units × avg price
Conversion rate: 22.3%
Avg BSR: #184
Page quality: 0%
Prime: 100%
Sponsored: 75%
Out of stock: 2.1%
Avg brand age: 111 months
Avg seller age: 172 days

Competition: brands, sellers & click share

The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.

Brands

16 falling

Sellers

Top-5 brand share

64%

Top 20: 100%

Top-5 click share

57%

Top 20: 100%

Open market

31%

NOW Foods30%
Horbäach14%
Double Wood Supplements9%
Nutricost6%
Pure Encapsulations5%
BulkSupplements5%

l glutamine capsules demand & seasonality

Weekly Amazon search volume, last 98 weeks — +3.5% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 2.4×

Open Trend

Top l glutamine capsules 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 20 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

NOW Foods Sports Nutrition L-Glutamine Double Strength 1 000 mg Amino Acid 120 Veg Capsules

NOW Foods$13.224.7★974 rev

Horbaach L Glutamine Capsules 1000mg | 180 Powder Pills

Horbäach$9.994.7★411 rev

L Glutamine Capsules - (1000mg Servings 120 Capsules) Non-GMO Gluten Free Keto Safe Vegan Friendly Third Party Tested (for Endurance and Gut Health) by Double Wood

Double Wood Supplements$9.924.6★542 rev

Nutricost L-Glutamine 800mg 180 Capsules - Gluten Free Non-GMO

Nutricost$15.774.5★4,740 rev

BulkSupplements.com L-Glutamine Capsules - Glutamine Supplement Amino Acid Supplement - Gluten Free 6 Capsules per Serving (5000mg) 360 Count (Pack of 1)

BulkSupplements$26.554.6★533 rev

Newest

by launch date

Nugenix Essentials L-Glutamine 1500mg 100% Botanical L-Glutamine Amino Acid Protein Synthesis Supports Cellular Function 60 Capsules

Nugenix$14.5386 rev

1y ago

NAKED L-Glutamine Muscle Recovery Capsules 1000mg 240 Count Made in The USA Non-GMO Gluten and Soy Free

NAKED$19.852,177 rev

2y ago

L Glutamine Capsules - (1000mg Servings 120 Capsules) Non-GMO Gluten Free Keto Safe Vegan Friendly Third Party Tested (for Endurance and Gut Health) by Double Wood

Double Wood Supplements$9.92542 rev

2y ago

Healthfare$14.2598 rev

3y ago

Horbaach L Glutamine Capsules 1000mg | 180 Powder Pills

Horbäach$9.99411 rev

3y ago

What reviews say buyers love and hate about l glutamine capsules

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

What buyers love

Quality-Overall25%

“Matches the description, good product”

Vitamin10%

“Best vitamin maker on the market”

Value For Money8%

“Good price”

Regulates Digestion6%

“HELPS GUT”

Advertised Vs Actual Product6%

“Good and as advertised”

Ease Of Chewing/Swallowing5%

“Easy on the stomach”

Acid Regulator/Stomach Ache Relief5%

“No more bloating”

Efficiency4%

“Seems Effective”

Cough Relief3%

“Its quality and works well for me in aiding recovery and gut health, easy to swallow, no after taste”

Immunity Booster3%

“This is a great general immune system”

What buyers complain about

Dosage12%

“I have learned that it is a very bad dosage amount”

Functionality-Overall10%

“Not working”

Ingredients-Overall8%

“Two bottles, different ingredients”

Quality-Overall7%

“Questionable quality control and handling”

Allergies6%

“have a corn allergy/intolerance”

Sleep Quality5%

“Makes me a bit hyper at night so I take in the morning”

Taste-Overall5%

“Zero Taste Capsule”

Smell4%

“Mine smelled”

Side Effects4%

“I stopped taking them and I am now off of them for 24 hours and can finally, sort of breathe again without thinking I need an inhaler”

Ease Of Use4%

“I cannot open the lid”

Top return reasons

Joint Pain50%

Size-Overall50%

Common l glutamine capsules questions

Is l glutamine capsules profitable to sell on Amazon United States?: The niche generates $32K/yr across 20 tracked products. 90-day search growth is +3.5%. Flapen's verdict: Worth a look (53/100).
How competitive is the l glutamine capsules niche?: 16 brands and 97 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 64% of demand.
What do buyers complain about in l glutamine capsules?: Top complaints mined from reviews: Dosage, Functionality-Overall, Ingredients-Overall. The return rate is 0.0%.
When does demand for l glutamine capsules peak?: Demand is steady year-round — the busiest month runs 2.4× the quietest.
What does it cost to enter the l glutamine capsules niche?: Listings span $9.35–$63.78; the average listing price is $20.22 (sweet spot $15–$100). The average incumbent carries 2,196 reviews — the moat a new listing must climb.