Is l citrulline profitable to sell on Amazon United Kingdom?

The niche generates £173K/yr across 10 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -11.5%. Flapen's verdict: Skip it (43/100).

How competitive is the l citrulline niche?

7 brands and 21 sellers compete. The top 5 products take 83% of clicks and top 5 brands hold 95% of demand.

What do buyers complain about in l citrulline?

Top complaints mined from reviews: Dosage, Taste-Overall, Functionality-Overall. The return rate is 0.0%.

When does demand for l citrulline peak?

Demand peaks in May; the busiest month runs 1.6× the quietest.

What does it cost to enter the l citrulline niche?

Listings span £6.52–£16.42; the average listing price is £9.67 (sweet spot $15–$100). The average incumbent carries 726 reviews — the moat a new listing must climb.

l citrulline

Skip it

Brand-locked demand (top 5 brands take 95% of clicks) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Great10.2%

search→purchase rate — share of searches ending in a sale

Review moat

Good725.5

avg incumbent reviews — the moat a new listing must climb

Quality gap

Good4.3★

avg incumbent rating — lower means beatable quality

Market size

Okay£173K

£173K/yr · 175K searches

Avg price

Okay£9.67

avg listing price — sweet spot $15–$100

Growth

Bad-11.5%

90-day search growth — must beat 0% to launch

Competition

Bad83%

top-5 click share — a locked-up shelf

Price range

Bad£6.52–£16.42

cheapest to priciest tracked listing — scored on the share inside $15–$100

Brand share

Bad95%

top-5 brand share — brand-locked demand

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.

Data updated Jul 25, 2026 · scored weekly · How we score niches

l citrulline market data

Units sold / yr: 15K–20K; avg 1,250–1,500/product
Revenue / yr: £145K–£193K; units × avg price
Conversion rate: 10.2%
Avg BSR: #7
Page quality: 0%
Prime: 100%
Sponsored: 80%
Out of stock: 4.9%
Avg brand age: 55 months
Avg seller age: 159 days

Competition & brand share

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

Brands

7 falling

Sellers

Top-5 brand share

95%

Top 20: 100%

Top-5 click share

83%

Top 20: 100%

Open market

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

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -11.5% search growth over the last 90 days.

Peak months: May · busiest ÷ quietest = 1.6×

Open Trend

Top l citrulline search terms

l citrulline73K/yr -13.8%7.2% conv.
l-citrulline45K/yr -10.3%8.8% conv.
citrulline28K/yr -28.2%6.2% conv.
l- citrulline8K/yr +44.7%4.8% conv.
l citrulline capsules12K/yr -17.1%8.1% conv.
l-citrulline capsules4K/yr +17.4%9.6% conv.
lcitrulline3K/yr +20.4%6.7% conv.
citruline3K/yr -16.6%8.7% conv.

All search terms

Top l citrulline 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 10 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

L Citrulline 3000mg - 240 L-Citrulline Capsules - 2 Months Supply

WeightWorld£16.424.3★1,331 rev

EVO NUTRITION£8.114.4★1,301 rev

L-Citrulline Malate 1500mg with BioPerine - 90 Vegan Capsules - High Strength Fermented Amino Acid Supplement - 45 Day Supply - Resealable and Recyclable Pouch by Alpha01

ALPHA01£6.524.5★156 rev

Applied Nutrition L-Citrulline 1500-1500mg L Citrulline Per Serving Citrulline Capsules for Muscle Pump Muscle Recovery Supplement Increases Levels of L-Arginine and Nitric Oxide - 60 Servings

Applied Nutrition£10.734.1★40 rev

Applied Nutrition Citrulline Malate 2:1 | 3000mg per Serving Nitric Oxide Booster Amino Acid Powder Supports Muscle Recovery Improves Performance Vegan Gluten Free (300g - 100 Servings) (Unflavoured)

Applied Nutrition£10.804.6★218 rev

Newest

by launch date

EVO NUTRITION£8.111,301 rev

11mo ago

Applied Nutrition L-Citrulline 1500-1500mg L Citrulline Per Serving Citrulline Capsules for Muscle Pump Muscle Recovery Supplement Increases Levels of L-Arginine and Nitric Oxide - 60 Servings

Applied Nutrition£10.7340 rev

1y ago

Applied Nutrition Citrulline Malate 2:1 | 3000mg per Serving Nitric Oxide Booster Amino Acid Powder Supports Muscle Recovery Improves Performance Vegan Gluten Free (300g - 100 Servings) (Unflavoured)

Applied Nutrition£10.80218 rev

2y ago

L Citrulline 3000mg - 240 L-Citrulline Capsules - 2 Months Supply

WeightWorld£16.421,331 rev

2y ago

Bandini CITRULLINE Malate 90 Tablets 3000 mg per Daily Dose - Extra-High Dosage (1 Month Coverage) - 100% Vegan L-Citrulline from Fermentation - Citrullin for Athletes and Bodybuilders

BANDINI£8.801,292 rev

3y ago

What buyers say about l citrulline

What buyers praise and complain about, mined from review topics.

What buyers love

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”

Ease Of Use5%

“Easy to use”

Energy Level4%

“More energy”

Vitamin4%

“Vitamin”

Side Effects3%

“no bad reactions”

Nutritional Content3%

“Good dietary supplement”

What buyers complain about

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”

Side Effects4%

“it had immediate effects”

Smell4%

“earthy smell that I found extremely unpleasant”

Blood Pressure3%

“I have high blood pressure”

Ease Of Chewing/Swallowing3%

“I cannot swallow it”

Advertised Vs Actual Product3%

“But it doesn't do like they advertise”

Common questions

Is l citrulline profitable to sell on Amazon United Kingdom?: The niche generates £173K/yr across 10 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -11.5%. Flapen's verdict: Skip it (43/100).
How competitive is the l citrulline niche?: 7 brands and 21 sellers compete. The top 5 products take 83% of clicks and top 5 brands hold 95% of demand.
What do buyers complain about in l citrulline?: Top complaints mined from reviews: Dosage, Taste-Overall, Functionality-Overall. The return rate is 0.0%.
When does demand for l citrulline peak?: Demand peaks in May; the busiest month runs 1.6× the quietest.
What does it cost to enter the l citrulline niche?: Listings span £6.52–£16.42; the average listing price is £9.67 (sweet spot $15–$100). The average incumbent carries 726 reviews — the moat a new listing must climb.