---
title: "L-glutamine 500mg Capsules — Amazon US Product Research"
canonical_url: "https://flapen.com/research/us/health-household/l-glutamine-500mg-capsules"
last_updated: "2026-08-12T15:06:00.294Z"
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description: "Amazon product research for l-glutamine 500mg capsules: $1K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for l-glutamine 500mg capsules: $1K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "L-glutamine 500mg Capsules — Amazon US Product Research"
---
# **L-glutamine 500mg Capsules**
**Skip it**
A small market ($13K/yr) — this niche doesn't clear our bar today.
Market size 3Growth 25Conversion 96Competition 31Returns 100Price range 67Avg price 80Brand share 47Review moat 42Quality gap 25
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****14.3%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$17.06**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$9.35–$26.55**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Okay****77%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Okay****2,310.15**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Okay****66%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Okay****+0.4%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Market size**
**Bad****$13K**
$13K/yr · 5K searches
## **Is l-glutamine 500mg capsules profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, l-glutamine 500mg capsules is a $13K/yr Amazon United States market (5K searches/yr). The top 5 brands hold 77% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 45/100.
Data updated Jul 25, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **l-glutamine 500mg capsules market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **500–750**
- avg 0–100/product
- **Revenue / yr**
- **$9K–$13K**
- units × avg price
- **Conversion rate**
- **14.3%**
- **Avg BSR**
- **#100**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **85%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **106 months**
- **Avg seller age**
- **181 days**
## **Competition: brands, sellers & click share**
The top 5 products take 66% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**11 **—flat
**Sellers**
**34**
**Top-5 brand share**
**77%**
Top 20: 100%
**Top-5 click share**
**66%**
Top 20: 100%
**Open market**
**18%**
- NOW Foods34% - Pure Encapsulations16% - Nutricost14% - THORNE7% - Horbäach6% - Amazing Nutrition5% - Open — no brand owns it (5 brands, 18%)
## **l-glutamine 500mg capsules demand & seasonality**
Weekly Amazon search volume, last 98 weeks — +0.4% search growth over the last 90 days.
600400Spike '24Spike '25Prime Day '25Spike '26 seasonDecMarJunAugNovMarMay
Peak months: Sep, Oct · busiest ÷ quietest = 2.3×
[**Open Trend **](https://flapen.com/research/us/health-household/l-glutamine-500mg-capsules/trend)
## **Top l-glutamine 500mg 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.
0%10%$1K20%$3K30%$4K40%$5K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 13 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**NOW Foods Supplements L-Glutamine 500 mg Nitrogen Transporter* Amino Acid 120 Veg Capsules**NOW Foods**$9.35**4.5★13,166 rev](https://www.amazon.com/dp/B000QVCAKQ) [2**Pure Encapsulations L-Glutamine 500 mg - Supplement for Immune and Digestive Support Gut Health and Lining Metabolism and Muscle Support* - with Free-Form L-Glutamine - 90 Capsules**Pure Encapsulations**$23.51**4.6★2,190 rev](https://www.amazon.com/dp/B000VYZG0O) [3**Nutricost L-Glutamine 800mg 180 Capsules - Gluten Free Non-GMO**Nutricost**$15.77**4.5★4,740 rev](https://www.amazon.com/dp/B01DCKSO84) [4**Now L-Glutamine 500mg 300 Veg Capsules - Non-GMO Supplement - Vegan Lglutamine Caps**NOW Foods**$23.97**4.7★1,330 rev](https://www.amazon.com/dp/B07HPDF1HT) [5**THORNE - L-Glutamine - Amino Acid Supplement for Immune System & GI Health - Promotes Post-Exercise Muscle Cell Repair* - Third-Party Certified - Gluten Dairy & Soy-Free - 90 Capsules**THORNE**$25.05**4.6★1,669 rev](https://www.amazon.com/dp/B0797N816M)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Vykee Nutrition L-Glutamine Capsules 1500 mg**Vykee Nutrition**$19.22**172 rev1y ago](https://www.amazon.com/dp/B0DRPQLPBS) [**NAKED L-Glutamine Muscle Recovery Capsules 1000mg 240 Count Made in The USA Non-GMO Gluten and Soy Free**NAKED**$19.85**2,177 rev2y ago](https://www.amazon.com/dp/B0CMXTTVK2) [**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**$9.92**542 rev2y ago](https://www.amazon.com/dp/B0CGB24861) [**Horbaach L Glutamine Capsules 1000mg | 180 Powder Pills**Horbäach**$9.99**411 rev3y ago](https://www.amazon.com/dp/B0C6N2N65F) [**Amazing Formulas L-Glutamine Amino Acid Supplement | 800 Mg Per Serving | 180 Capsules | Non-GMO | Gluten Free | Made in USA**Amazing Nutrition**$14.97**61 rev3y ago](https://www.amazon.com/dp/B0C3HPPWQ7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**NOW Foods Sports Nutrition L-Glutamine Double Strength 1 000 mg Amino Acid 120 Veg Capsules**NOW Foods**$13.22**4.7★**▲ 161%**](https://www.amazon.com/dp/B0013OQLD2) [**BulkSupplements.com L-Glutamine Capsules - Glutamine Supplement Amino Acid Supplement - Gluten Free 6 Capsules per Serving (5000mg) 360 Count (Pack of 1)**BulkSupplements**$26.55**4.6★**▲ 33%**](https://www.amazon.com/dp/B0BX1CLKN1) [**THORNE - L-Glutamine - Amino Acid Supplement for Immune System & GI Health - Promotes Post-Exercise Muscle Cell Repair* - Third-Party Certified - Gluten Dairy & Soy-Free - 90 Capsules**THORNE**$25.05**4.6★**▲ 28%**](https://www.amazon.com/dp/B0797N816M) [**NAKED L-Glutamine Muscle Recovery Capsules 1000mg 240 Count Made in The USA Non-GMO Gluten and Soy Free**NAKED**$19.85**4.7★**▲ 28%**](https://www.amazon.com/dp/B0CMXTTVK2) [**Horbaach L Glutamine Capsules 1000mg | 180 Powder Pills**Horbäach**$9.99**4.7★**▲ 16%**](https://www.amazon.com/dp/B0C6N2N65F)
**~~View all trending →~~**
## **What reviews say buyers love and hate about l-glutamine 500mg capsules**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**23%
*“Matches the description, good product”*
**Vitamin**11%
*“Best vitamin maker on the market”*
**Value For Money**9%
*“Good price”*
**Regulates Digestion**6%
*“HELPS GUT”*
**Advertised Vs Actual Product**6%
*“Good and as advertised”*
**Ease Of Chewing/Swallowing**5%
*“Easy on the stomach”*
**Efficiency**4%
*“Seems Effective”*
**Acid Regulator/Stomach Ache Relief**3%
*“No more bloating”*
**Cough Relief**3%
*“Its quality and works well for me in aiding recovery and gut health, easy to swallow, no after taste”*
**Inflammation**2%
*“this L Glutamine is great for wound victims”*
### **What buyers complain about **
**Dosage**15%
*“I have learned that it is a very bad dosage amount”*
**Functionality-Overall**10%
*“Not working”*
**Ingredients-Overall**8%
*“Two bottles, different ingredients”*
**Quality-Overall**8%
*“Questionable quality control and handling”*
**Allergies**6%
*“have a corn allergy/intolerance”*
**Sleep Quality**6%
*“Makes me a bit hyper at night so I take in the morning”*
**Vitamin**4%
*“There are certain vitamins and supplements that I can live without but this isn't one of them.”*
**Smell**4%
*“Mine smelled”*
**Ease Of Use**4%
*“I cannot open the lid”*
**Taste-Overall**4%
*“Totally tasteless and not super expensive”*
### **Top return reasons **
**Size-Overall**33%
**Inflammation**33%
**Dosage**17%
**Regulates Digestion**17%
## **Common l-glutamine 500mg capsules questions**
- **Is l-glutamine 500mg capsules profitable to sell on Amazon United States?**
- The niche generates $13K/yr across 13 tracked products. 90-day search growth is +0.4%. Flapen's verdict: Skip it (45/100).
- **How competitive is the l-glutamine 500mg capsules niche?**
- 11 brands and 34 sellers compete. The top 5 products take 66% of clicks and top 5 brands hold 77% of demand.
- **What do buyers complain about in l-glutamine 500mg capsules?**
- Top complaints mined from reviews: Dosage, Functionality-Overall, Ingredients-Overall. The return rate is 0.0%.
- **When does demand for l-glutamine 500mg capsules peak?**
- Demand peaks in Sep–Oct; the busiest month runs 2.3× the quietest.
- **What does it cost to enter the l-glutamine 500mg capsules niche?**
- Listings span $9.35–$26.55; the average listing price is $17.06 (sweet spot $15–$100). The average incumbent carries 2,310 reviews — the moat a new listing must climb.
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