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L Citrulline

brand-locked demand (top 5 brands take 95% of clicks) — L Citrulline doesn't clear our bar today.

Flapen Score

43
Skip it
Market size 35Growth 19Conversion 88Competition 14Returns 100Price range 14Avg price 31Brand share 12Review moat 69Quality gap 68
This niche Category average

Is L Citrulline profitable on Amazon?

According to Flapen's Amazon United Kingdom niche tracking, L Citrulline is a £173K/yr Amazon United Kingdom market (175K searches/yr). The top 5 brands hold 95% of demand. Demand peaks in May. Verdict: Skip it — 43/100.

L Citrulline: the Amazon niche in one read

Everything a seller checks before entering, in three answers.

Is the demand real?

Not really. Search demand moved -11.5% over the last 90 days and 10.2% of searches end in a purchase.

£173K

revenue / yr

Units sold / yr20K
Search volume / yr-11.5%175K
Conversion rate10.2%
Avg price£9.67

Who owns the niche?

The top 5 brands hold 95% of demand, so 5% of the market is open.

5%

open market share

Brands · sellers7 · 21
Top-5 product click share83%
Open market5%
Avg brand age55 months

Is there a way in?

Listing quality. The average product page scores 0/100 on content standards. Incumbents average 4.3★ — the gap to enter on.

0/100

page quality · 10 products

Sponsored placement80%
New entrants (1y)1· 1 succeeded
Avg rating4.3★
Avg reviews726

Top L Citrulline products & what they sell for

Every tracked product — its share of the shelf, its review moat, and what it sells for.

Competition: brands, sellers & click share

The top 5 products capture 83% of clicks — a locked-up shelf that new listings rarely crack.

£0£17K£35K£52K£69K101001K10K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

7 falling

Sellers

21

Top-5 brand share

95%

Top 20: 100%

Top-5 click share

83%

Top 20: 100%

Open market

2%

  • WeightWorld40%
  • Applied Nutrition17%
  • EVO NUTRITION16%
  • ALPHA0114%
  • Best Naturals9%
  • Bulk3%
  • Open — no brand owns it (1 brand, 2%)

L Citrulline demand & seasonality

Weekly search volume, with the niche's key stats alongside.

Volume175KCVR10.2%Products10Brands7Top 5 Brands95%OOS Rate4.9%Rating4.3★Reviews726Avg BSR#7
5K4KSpike '24Spike '25Black Friday '25Spike '26SepDecMarJunAugNovMarMay

Peak months: May · busiest ÷ quietest = 1.6×

Top L Citrulline search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

  • l citrulline73K/yr
  • l-citrulline45K/yr
  • citrulline28K/yr
  • l- citrulline8K/yr
  • l citrulline capsules12K/yr
  • l-citrulline capsules4K/yr
  • lcitrulline3K/yr
  • citruline3K/yr

What reviews say buyers love and hate about L Citrulline

What buyers mention most, as a share of all reviews.

What buyers love

72% of reviews
Quality-Overall20%

Well-made, easy to take

Value For Money11%

Good value

Advertised Vs Actual Product10%

As advertised well pleased

Ease Of Chewing/Swallowing7%

easy to take without any gut issues

Blood Pressure6%

blood pressure is good

What buyers complain about

59% of reviews
Dosage13%

Can't say if they've done anything for me after taking 180 tablets

Taste-Overall12%

have no taste

Functionality-Overall7%

Not working

Ingredients-Overall6%

Very poor quality as the main ingredient is corn starch which is just a filler

Size-Overall4%

They are small

Common L Citrulline questions

The questions sellers ask about this niche, answered from the tracked metrics.

Flapen scores L Citrulline 43/100 on Amazon United Kingdom — Skip it. The niche generates £173K/yr across 10 tracked products. 1 of 1 products launched in the last 360 days are still selling. Search demand moved -11.5% over the last 90 days.
Search demand for L Citrulline on Amazon United Kingdom peaks in May, where the busiest month runs 1.6× the quietest.