---
title: "L-arginine 500mg — $4K/mo Amazon US Product Research (2026)"
canonical_url: "https://flapen.com/research/us/health-household/l-arginine-500mg"
last_updated: "2026-08-12T15:05:58.837Z"
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description: "Amazon product research for l-arginine 500mg: $4K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for l-arginine 500mg: $4K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "L-arginine 500mg — $4K/mo Amazon US Product Research (2026)"
---
# **L-arginine 500mg**
**Skip it**
A small market ($47K/yr) — this niche doesn't clear our bar today.
Market size 12Growth 28Conversion 98Competition 20Returns 100Price range 78Avg price 82Brand share 27Review moat 23Quality gap 37
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****16.4%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$17.83**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$7.76–$42.79**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Growth**
**Okay****+2.3%**
90-day search growth — must beat 0% to launch
**Brand share**
**Okay****89%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Bad****7,841.93**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Bad****77%**
top-5 click share — a locked-up shelf
**Market size**
**Bad****$47K**
$47K/yr · 16K searches
## **Is l-arginine 500mg profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, l-arginine 500mg is a $47K/yr Amazon United States market (16K searches/yr). The top 5 brands hold 89% of demand. Verdict: Skip it — 44/100.
Data updated Jul 25, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **l-arginine 500mg market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **3K–3K**
- avg 100–250/product
- **Revenue / yr**
- **$45K–$53K**
- units × avg price
- **Conversion rate**
- **16.4%**
- **Avg BSR**
- **#264**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **64%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **112 months**
- **Avg seller age**
- **167 days**
## **Competition: brands, sellers & click share**
The top 5 products capture 77% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**9 **—flat
**Sellers**
**584**
**Top-5 brand share**
**89%**
Top 20: 100%
**Top-5 click share**
**77%**
Top 20: 100%
**Open market**
**7%**
- NOW Foods41% - Nutricost19% - Best Naturals15% - Spring Valley8% - HAVASU NUTRITION5% - 365 by Whole Foods Market4% - Open — no brand owns it (3 brands, 7%)
## **l-arginine 500mg demand & seasonality**
Weekly Amazon search volume, last 98 weeks — +2.3% search growth over the last 90 days.
500300Spike '25Spike '26 seasonDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/us/health-household/l-arginine-500mg/trend)
## **Top l-arginine 500mg 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%$5K20%$9K30%$14K40%$19K1001K10K100K 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**NOW Foods Supplements L-Arginine 500 mg Nitric Oxide Precursor* Amino Acid 250 Veg Capsules**NOW Foods**$15.70**4.6★7,305 rev](https://www.amazon.com/dp/B0013OVX58) [2**Nutricost L-Arginine 500mg 300 Capsules - Gluten Free and Non-GMO**Nutricost**$17.70**4.6★3,060 rev](https://www.amazon.com/dp/B01CUWIURK) [3**Best Naturals L-Arginine 500mg 250 Capsules - Pharmaceutical Grade L Arginine supplement promotes nitric oxide synthesis**Best Naturals**$11.92**4.7★336 rev](https://www.amazon.com/dp/B00MNRNXRU) [4**NOW Foods Supplements L-Arginine 500 mg Nitric Oxide Precursor* Amino Acid 100 Veg Capsules**NOW Foods**$7.76**4.6★7,305 rev](https://www.amazon.com/dp/B000J6DYJO) [5**Spring Valley: 100 Capsules 500 Mg Ea. L-Arginine (Pack of 2)**Spring Valley**$18.45**4.1★106 rev](https://www.amazon.com/dp/B07C8LNBHC)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Spring Valley: 100 Capsules 500 Mg Ea. L-Arginine (Pack of 2)**Spring Valley**$18.45**106 rev8y ago](https://www.amazon.com/dp/B07C8LNBHC) [**365 by Whole Foods Market L Arginine 500Mg 100 Veggie Caps**365 by Whole Foods Market**$10.71**184 rev8y ago](https://www.amazon.com/dp/B074H6R39L) [**L-Arginine and L-Citrulline for Men Nitric Oxide Support 30 Servings**HAVASU NUTRITION**$23.73**55,008 rev9y ago](https://www.amazon.com/dp/B01MS461VC) [**Nutricost L-Arginine 500mg 300 Capsules - Gluten Free and Non-GMO**Nutricost**$17.70**3,060 rev10y ago](https://www.amazon.com/dp/B01CUWIURK) [**Best Naturals L-Arginine 500mg 250 Capsules - Pharmaceutical Grade L Arginine supplement promotes nitric oxide synthesis**Best Naturals**$11.92**336 rev11y ago](https://www.amazon.com/dp/B00MNRNXRU)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Best Naturals L-Arginine 500mg 250 Capsules (250 Count (Pack of 2))**Best Naturals**$21.43**4.7★**▲ 104%**](https://www.amazon.com/dp/B09QBWC816) [**365 by Whole Foods Market L Arginine 500Mg 100 Veggie Caps**365 by Whole Foods Market**$10.71**4.5★**▲ 68%**](https://www.amazon.com/dp/B074H6R39L) [**L-Arginine and L-Citrulline for Men Nitric Oxide Support 30 Servings**HAVASU NUTRITION**$23.73**4.2★**▲ 65%**](https://www.amazon.com/dp/B01MS461VC) [**NOW Foods Supplements L-Arginine 1 000 mg Nitric Oxide Precursor* Amino Acid 120 Tablets**NOW Foods**$17.04**4.5★**▲ 62%**](https://www.amazon.com/dp/B0013OVX3U) [**Swanson Amino Acid L-Arginine 500 Milligrams 200 Capsules**Swanson**$13.20**4.6★**▲ 29%**](https://www.amazon.com/dp/B00068G7OO)
**~~View all trending →~~**
## **What reviews say buyers love and hate about l-arginine 500mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**18%
*“High Quality & Easy to Take”*
**Value For Money**10%
*“really solid value for what you get”*
**Vitamin**10%
*“Excellent supplement”*
**Advertised Vs Actual Product**8%
*“As advertised”*
**Efficiency**8%
*“There are many benefits to taking this”*
**Blood Pressure**5%
*“Lowers my blood pressure”*
**Nutritional Content**4%
*“good quality supplement from a trusted brand”*
**Heart Health**4%
*“Circulation support”*
**Energy Level**3%
*“Energy”*
**Ease Of Use**2%
*“easy to take while giving you the most out of what you take”*
### **What buyers complain about **
**Size-Overall**28%
*“Capsules too large”*
**Ease Of Chewing/Swallowing**16%
*“couldn't swallow them”*
**Dosage**15%
*“Over size pills”*
**Functionality-Overall**5%
*“Doesnt Work”*
**Side Effects**4%
*“made her feel worse”*
**Quality-Overall**4%
*“it is cheap”*
**Vitamin**3%
*“I am not sure about the effectiveness of this supplement”*
**Advertised Vs Actual Product**2%
*“Even so, although I have seen benefits, they have not been as marked as I expected”*
**Blood Pressure**2%
*“I did not know that people with high blood pressure couldn' t take This product”*
**Solubility**2%
*“The product did not dissolve”*
### **Top return reasons **
**Value For Money**20%
**Size-Overall**20%
**Advertised Vs Actual Product**20%
**Quality-Overall**20%
**Dosage**10%
**Ease Of Chewing/Swallowing**10%
## **Common l-arginine 500mg questions**
- **Is l-arginine 500mg profitable to sell on Amazon United States?**
- The niche generates $47K/yr across 14 tracked products. 90-day search growth is +2.3%. Flapen's verdict: Skip it (44/100).
- **How competitive is the l-arginine 500mg niche?**
- 9 brands and 584 sellers compete. The top 5 products take 77% of clicks and top 5 brands hold 89% of demand.
- **What do buyers complain about in l-arginine 500mg?**
- Top complaints mined from reviews: Size-Overall, Ease Of Chewing/Swallowing, Dosage. The return rate is 0.0%.
- **When does demand for l-arginine 500mg peak?**
- Demand is steady year-round — the busiest month runs 1.7× the quietest.
- **What does it cost to enter the l-arginine 500mg niche?**
- Listings span $7.76–$42.79; the average listing price is $17.83 (sweet spot $15–$100). The average incumbent carries 7,842 reviews — the moat a new listing must climb.
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