L-arginine 500mg
Skip itA small market ($47K/yr) — this niche doesn't clear our bar today.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Incredible16.4%search→purchase rate — share of searches ending in a sale
Avg price
Great$17.83avg listing price — sweet spot $15–$100
Price range
Great$7.76–$42.79cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Growth
Okay+2.3%90-day search growth — must beat 0% to launch
Brand share
Okay89%top-5 brand share — brands hold most of the demand
Review moat
Bad7,841.93avg incumbent reviews — the moat a new listing must climb
Competition
Bad77%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
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.No pronounced peak months · busiest ÷ quietest = 1.7×
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.
All 14 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
NOW Foods Supplements L-Arginine 500 mg Nitric Oxide Precursor* Amino Acid 250 Veg Capsules
NOW Foods$15.704.6★7,305 rev
Nutricost L-Arginine 500mg 300 Capsules - Gluten Free and Non-GMO
Nutricost$17.704.6★3,060 rev
Best Naturals L-Arginine 500mg 250 Capsules - Pharmaceutical Grade L Arginine supplement promotes nitric oxide synthesis
Best Naturals$11.924.7★336 rev
NOW Foods Supplements L-Arginine 500 mg Nitric Oxide Precursor* Amino Acid 100 Veg Capsules
NOW Foods$7.764.6★7,305 rev
Spring Valley: 100 Capsules 500 Mg Ea. L-Arginine (Pack of 2)
Spring Valley$18.454.1★106 rev
Newest
by launch dateSpring Valley: 100 Capsules 500 Mg Ea. L-Arginine (Pack of 2)
Spring Valley$18.45106 rev
365 by Whole Foods Market L Arginine 500Mg 100 Veggie Caps
365 by Whole Foods Market$10.71184 rev
L-Arginine and L-Citrulline for Men Nitric Oxide Support 30 Servings
HAVASU NUTRITION$23.7355,008 rev
Nutricost L-Arginine 500mg 300 Capsules - Gluten Free and Non-GMO
Nutricost$17.703,060 rev
Best Naturals L-Arginine 500mg 250 Capsules - Pharmaceutical Grade L Arginine supplement promotes nitric oxide synthesis
Best Naturals$11.92336 rev
Trending
90-day click momentum
Best Naturals L-Arginine 500mg 250 Capsules (250 Count (Pack of 2))
Best Naturals$21.434.7★
365 by Whole Foods Market L Arginine 500Mg 100 Veggie Caps
365 by Whole Foods Market$10.714.5★
L-Arginine and L-Citrulline for Men Nitric Oxide Support 30 Servings
HAVASU NUTRITION$23.734.2★
NOW Foods Supplements L-Arginine 1 000 mg Nitric Oxide Precursor* Amino Acid 120 Tablets
NOW Foods$17.044.5★
Swanson Amino Acid L-Arginine 500 Milligrams 200 Capsules
Swanson$13.204.6★
What reviews say buyers love and hate about l-arginine 500mg
What buyers praise and complain about, mined from review topics.What buyers love
“High Quality & Easy to Take”
“really solid value for what you get”
“Excellent supplement”
“As advertised”
“There are many benefits to taking this”
“Lowers my blood pressure”
“good quality supplement from a trusted brand”
“Circulation support”
“Energy”
“easy to take while giving you the most out of what you take”
What buyers complain about
“Capsules too large”
“couldn't swallow them”
“Over size pills”
“Doesnt Work”
“made her feel worse”
“it is cheap”
“I am not sure about the effectiveness of this supplement”
“Even so, although I have seen benefits, they have not been as marked as I expected”
“I did not know that people with high blood pressure couldn' t take This product”
“The product did not dissolve”
Top return reasons
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.