---
title: "Ornithine — $115K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/ornithine"
last_updated: "2026-08-12T03:18:24.295Z"
locale: en
meta:
description: "Niche score 51/100 · $115K/yr market · 52K searches/yr. A concentrated shelf (top 5 take 72% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 51/100 · $115K/yr market · 52K searches/yr. A concentrated shelf (top 5 take 72% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Ornithine — $115K/yr Amazon US Niche (2026) - Flapen"
---
# **ornithine**
**Worth a look**
Shows low returns (0.1%), but a concentrated shelf (top 5 take 72% of clicks) keeps it on the watch list.
Market size 27Growth 43Conversion 95Competition 23Returns 100Price range 81Avg price 83Brand share 30Review moat 78Quality gap 25
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****12.2%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$18.10**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$9.82–$39.44**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Great****436**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Okay****+14.4%**
90-day search growth — must beat 0% to launch
**Brand share**
**Okay****87%**
top-5 brand share — brands hold most of the demand
**Market size**
**Okay****$115K**
$115K/yr · 52K searches
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****72%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United States niche tracking, ornithine is a $115K/yr Amazon United States market (52K searches/yr). The top 5 brands hold 87% of demand. Verdict: Worth a look — 51/100.
Data updated Jul 25, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **ornithine market data**
- **Units sold / yr**
- **5K–6K**
- avg 250–500/product
- **Revenue / yr**
- **$91K–$109K**
- units × avg price
- **Conversion rate**
- **12.2%**
- **Avg BSR**
- **#708**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **79%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **103 months**
- **Avg seller age**
- **185 days**
## **Competition & brand share**
The top 5 products capture 72% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**9 **▲rising
**Sellers**
**22**
**Top-5 brand share**
**87%**
Top 20: 100%
**Top-5 click share**
**72%**
Top 20: 100%
**Open market**
**7%**
- Nutricost31% - NOW Foods22% - BulkSupplements16% - Dr Clark Store12% - Amazing Nutrition6% - Horbäach5% - Open — no brand owns it (3 brands, 7%)
## **Demand & seasonality**
Weekly Amazon search volume, last 97 weeks — +14.4% search growth over the last 90 days.
2K1KSpike '25Prime Day '25Spike '26 seasonDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.5×
[**Open Trend **](https://flapen.com/research/us/health-household/ornithine/trend)
## **Top ornithine search terms**
- **l ornithine**17K/yr+42.2%7.5% conv. - **ornithine**19K/yr+4.3%9.0% conv. - **l-ornithine**11K/yr+6.5%10.4% conv. - **ornithine supplement**6K/yr-12.7%12.6% conv. [**All search terms **](https://flapen.com/research/us/health-household/ornithine/search-terms)
## **Top ornithine 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.
0%10%$12K20%$23K30%$35K40%$46K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 14 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Nutricost L-Ornithine 500mg 180 Capsules - Non-GMO and Gluten Free**Nutricost**$14.82**4.6★637 rev](https://www.amazon.com/dp/B01CO7I06W) [2**NOW Foods Supplements L-Ornithine (L-Ornithine Hydrochloride) 500 mg Amino Acid 120 Veg Capsules**NOW Foods**$14.79**4.7★1,584 rev](https://www.amazon.com/dp/B0013OQLJQ) [3**Dr Clark Ornithine Dietary Supplement 500mg 100 Gelatin Capsules Pure Amino Acid Support for Natural Sleep Aid Promotes Protein Metabolism Cleansing and Detoxification Non-GMO & Gluten Free**Dr Clark Store**$18.90**4.6★448 rev](https://www.amazon.com/dp/B015T6UHHK) [4**Nutricost L-Arginine L-Ornithine 750mg; 180 Capsules**Nutricost**$16.73**4.6★1,464 rev](https://www.amazon.com/dp/B01CKNC8GI) [5**BulkSupplements.com L-Ornithine HCl Capsules (360 Count (Pack of 1)**BulkSupplements**$19.76**4.6★54 rev](https://www.amazon.com/dp/B0F8X85J83)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Pure Encapsulations Growth Hormone Support - Arginine & Ornithine Amino Acid Blend - Supports Healthy Hormone Balance - Muscles & Training Support - Gluten-Free & Non-GMO - 90 Capsules**Pure Encapsulations**$39.44**29 rev4mo ago](https://www.amazon.com/dp/B003PQZLK0) [**BulkSupplements.com L-Ornithine HCl Capsules (360 Count (Pack of 1)**BulkSupplements**$19.76**54 rev1y ago](https://www.amazon.com/dp/B0F8X85J83) [**BulkSupplements.com L-Ornithine HCl Capsules - L-Ornithine Hydrochloride L-Ornithine 1000mg - Amino Acids Supplement Gluten Free 2 Capsules per Serving 180 Count (Pack of 1)**BulkSupplements**$17.02**54 rev3y ago](https://www.amazon.com/dp/B0BRBPZRD4) [**Best Naturals L-Arginine L-Ornithine - 1000mg per Serving - 120 Tablets - Non-GMO & Gluten Free (120 Count (Pack of 1))**Best Naturals**$9.82**294 rev3y ago](https://www.amazon.com/dp/B0BLY4N6C4) [**Pure Original Ingredients L-Ornithine (100 Capsules) Always Pure No Additives Or Fillers Lab Verified**PURE ORIGINAL INGREDIENTS**$11.02**45 rev4y ago](https://www.amazon.com/dp/B09F86VT1Y)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Pure Encapsulations Growth Hormone Support - Arginine & Ornithine Amino Acid Blend - Supports Healthy Hormone Balance - Muscles & Training Support - Gluten-Free & Non-GMO - 90 Capsules**Pure Encapsulations**$39.44**4.5★**▲ 306%**](https://www.amazon.com/dp/B003PQZLK0) [**BulkSupplements.com L-Ornithine HCl Capsules (360 Count (Pack of 1)**BulkSupplements**$19.76**4.6★**▲ 101%**](https://www.amazon.com/dp/B0F8X85J83) [**Amazing Formulas L-Ornithine 1500 Mg Per Serving Veggie Capsules Supplement | Non-GMO | Gluten Free | Made in USA (120 Count)**Amazing Nutrition**$12.89**4.7★**▲ 83%**](https://www.amazon.com/dp/B07R66ZTFN) [**BulkSupplements.com L-Ornithine L-Aspartate Powder - Ornithine Supplement Amino Acid Supplement - Gluten Free 3g per Serving 250g (8.8 oz) (Pack of 1)**BulkSupplements**$18.88**4.6★**▲ 38%**](https://www.amazon.com/dp/B07Q2567YM) [**Best Naturals L-Arginine L-Ornithine - 1000mg per Serving - 120 Tablets - Non-GMO & Gluten Free (120 Count (Pack of 1))**Best Naturals**$9.82**4.5★**▲ 17%**](https://www.amazon.com/dp/B0BLY4N6C4)
**~~View all trending →~~**
## **What buyers say about ornithine**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**21%
*“Good product”*
**Vitamin**19%
*“Great supplement”*
**Sleep Quality**13%
*“It works for sleep”*
**Advertised Vs Actual Product**9%
*“As advertised”*
**Taste-Overall**7%
*“No taste or odor and has helped me replace my sleeping and anxiety meds”*
**Nutritional Content**3%
*“I will definitely keep taking this product as long as I am on a high protein diet”*
**Ingredients-Overall**3%
*“Best clean ingredients”*
**Contamination Free**3%
*“not have contamination”*
**Size-Overall**2%
*“thinner so it fits in my circular Lazy Susan lol”*
**Heart Health**2%
*“Good sleep, good for heart”*
### **What buyers complain about **
**Smell**25%
*“The real deal should have almost no smell”*
**Inflammation**17%
*“I can feel the inflammation going down”*
### **Top return reasons **
**Value For Money**100%
## **Common questions**
- **Is ornithine profitable to sell on Amazon United States?**
- The niche generates $115K/yr across 14 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +14.4%. Flapen's verdict: Worth a look (51/100).
- **How competitive is the ornithine niche?**
- 9 brands and 22 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 87% of demand.
- **What do buyers complain about in ornithine?**
- Top complaints mined from reviews: Smell, Inflammation. The return rate is 0.1%.
- **When does demand for ornithine peak?**
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- **What does it cost to enter the ornithine niche?**
- Listings span $9.82–$39.44; the average listing price is $18.10 (sweet spot $15–$100). The average incumbent carries 436 reviews — the moat a new listing must climb.
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