l arginine
Worth a lookShows low returns (0.1%), but soft demand (-5.8% this quarter) keeps it on the watch list.
Returns
Incredible0.1%return rate — above 5% kills the launch gate
Conversion
Great9.2%search→purchase rate — share of searches ending in a sale
Quality gap
Good4.3★avg incumbent rating — lower means beatable quality
Brand share
Good67%top-5 brand share — brands hold most of the demand
Competition
Good51%top-5 click share — leaders hold, buyers still browse
Avg price
Okay£10.85avg listing price — sweet spot $15–$100
Review moat
Okay2,767.04avg incumbent reviews — the moat a new listing must climb
Market size
Okay£156K£156K/yr · 157K searches
Price range
Bad£3.06–£18.79cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Bad-5.8%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United Kingdom niche tracking, l arginine is a £156K/yr Amazon United Kingdom market (157K searches/yr). The top 5 brands hold 67% of demand. Verdict: Worth a look — 54/100.
Data updated Jul 25, 2026 · scored weekly · How we score niches
l arginine market data
- Units sold / yr
- 13K–15K
- avg 500–750/product
- Revenue / yr
- £136K–£163K
- units × avg price
- Conversion rate
- 9.2%
- Avg BSR
- #19
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 79%
- Out of stock
- 1.0%
- Avg brand age
- 46 months
- Avg seller age
- 162 days
Competition & brand share
The top 5 products take 51% of clicks — established leaders, but buyers still shop beyond them.Brands
16 falling
Sellers
37
Top-5 brand share
67%
Top 20: 100%
Top-5 click share
51%
Top 20: 96%
Open market
25%
- Best Naturals20%
- Horbäach16%
- Solgar15%
- Vitamaze - amazing life9%
- HAVASU NUTRITION8%
- ALPHA018%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -5.8% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.4×
Top l arginine search terms
- l arginine66K/yr
- l-arginine38K/yr
- arginine24K/yr
- arginine supplement8K/yr
- larginine5K/yr
- l arginine 1000mg capsules6K/yr
- larginine supplements men4K/yr
- l-arginine nutritional supplements3K/yr
- l arginine supplements for men3K/yr
Top l arginine 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
L Arginine and L Citrulline 1200mg Capsules | 180 Count | Amino Acids | Supplements for Men and Women | Suitable for Vegans & Vegetarians | by Horbaach
Horbäach£8.394.4★953 rev
Solgar L-Arginine 1000mg Tablets - Pack of 90 - for a Healthy Metabolism - Ideal for Athletes - Vegan and Gluten Free Gold
Solgar£14.404.5★490 rev
L Arginine 4500 mg 360 Capsules for Sport Performance Booster Supplements for Men and Women Natural Supplement of Pure L Arginine Without Additives Vitamaze
Vitamaze - amazing life£15.734.3★5,376 rev
L Arginine Supplement for Men | NO Nitric Oxide Supplements for Men | Workouts & Endurance | L-Arginine L Citrulline Complex with Beet Root Powder for Male Health | Non-GMO Gluten-Free | 60 Ct
HAVASU NUTRITION£15.774.2★46,796 rev
Bandini L-Arginine 360 Capsules - 4500 mg High Dosage - Caps with Pure L Arginin HCL Powder - Natural Food Supplement - No Additives Vegan - Ideal for Athletes - Italian Quality
BANDINI£14.734.2★415 rev
Newest
by launch date
L Arginine and L Citrulline with Beetroot Extract - Nitric Oxide Supplement - 120 Vegan Capsules 2 Month Supply for Men & Women - Non-GMO UK Made by New Leaf
NEW LEAF PRODUCTS£11.660 rev
Bandini L-Arginine 360 Capsules - 4500 mg High Dosage - Caps with Pure L Arginin HCL Powder - Natural Food Supplement - No Additives Vegan - Ideal for Athletes - Italian Quality
BANDINI£14.73415 rev
Applied Nutrition AAKG - L Arginine Alpha Ketoglutarate 3000mg per Serving Nitric Oxide Pre Workout Energy Boost Muscle Pump Supplement (300g - 100 Servings)
Applied Nutrition£12.2453 rev
3 000mg Nitric Oxide Supplement - 99% Purified L-Arginine and L-Citrulline - Beet Root - Clinically Studied Velox Blend - Nitric Oxide Booster for Men - 120 Capsules - Toniiq
Toniiq£18.79954 rev
Applied Nutrition L-Arginine Capsules - 1500mg High Strength L Arginine Per Serving Nitric Oxide Booster for Workout & Performance (60 Servings)
Applied Nutrition£13.2616 rev
Trending
90-day click momentumL Arginine and L Citrulline with Beetroot Extract - Nitric Oxide Supplement - 120 Vegan Capsules 2 Month Supply for Men & Women - Non-GMO UK Made by New Leaf
NEW LEAF PRODUCTS£11.660.0★
Solgar L-Arginine 1000mg Tablets - Pack of 90 - for a Healthy Metabolism - Ideal for Athletes - Vegan and Gluten Free Gold
Solgar£14.404.5★
Best Naturals L-Arginine L-Citrulline Complex 1000 mg 250 Tablets (250 Count (Pack of 1))
Best Naturals£18.074.3★
Nuke Nutrition L Arginine Capsules 1500mg - 60 Capsules - Nitric Oxide Supplement for Men & Women to Improve Muscle Strength Endurance & Mass - Nutritional Pre Workout - Nitric Acid Pills for Energy
Nuke Nutrition£7.514.4★
Nitric Oxide L-Arginine 100% Pre Workout Supports Athletic Performance and Muscle Building | 120 Capsules
NutriVolv£6.454.4★
What buyers say about l arginine
What buyers praise and complain about, mined from review topics.What buyers love
“so far no complaints”
“fair price”
“does the job”
“Seems effective and simple to take”
“This supplement has really sorted out my BP”
“Excellent supplement”
“energy levels to some extent”
“Easy to swallow”
“Simple and easy to use”
“Decent supplement overall”
What buyers complain about
“No idea whether they work or not”
“Overpriced”
“Very misleading”
“Amoyyou have to take”
“Appears to have an aphrodisiac side effect”
“Not the best”
“this tasted really bad”
“I found that these tablets are disintegrated to powder”
“Nitric oxide pills are a scam”
“I sometimes had trouble getting my deep breath”
Top return reasons
Common questions
- Is l arginine profitable to sell on Amazon United Kingdom?
- The niche generates £156K/yr across 24 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -5.8%. Flapen's verdict: Worth a look (54/100).
- How competitive is the l arginine niche?
- 16 brands and 37 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 67% of demand.
- What do buyers complain about in l arginine?
- Top complaints mined from reviews: Functionality-Overall, Value For Money, Advertised Vs Actual Product. The return rate is 0.1%.
- When does demand for l arginine peak?
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- What does it cost to enter the l arginine niche?
- Listings span £3.06–£18.79; the average listing price is £10.85 (sweet spot $15–$100). The average incumbent carries 2,767 reviews — the moat a new listing must climb.