Is l citrulline profitable to sell on Amazon United States?

The niche generates $4.3M/yr across 29 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is -1.8%. Flapen's verdict: Worth a look (66/100).

How competitive is the l citrulline niche?

17 brands and 30 sellers compete. The top 5 products take 47% of clicks and top 5 brands hold 72% of demand.

What do buyers complain about in l citrulline?

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

When does demand for l citrulline peak?

Demand is steady year-round — the busiest month runs 1.5× the quietest.

What does it cost to enter the l citrulline niche?

Listings span $10.10–$76.27; the average listing price is $24.70 (sweet spot $15–$100). The average incumbent carries 5,971 reviews — the moat a new listing must climb.

L Citrulline

Worth a look

Shows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Market size

Incredible$4.3M

$4.3M/yr · 1.6M searches

Avg price

Incredible$24.70

avg listing price — sweet spot $15–$100

Conversion

Great11.0%

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

Price range

Great$10.10–$76.27

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

Competition

Good47%

top-5 click share — leaders hold, buyers still browse

Brand share

Good72%

top-5 brand share — brands hold most of the demand

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Growth

Bad-1.8%

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

Review moat

Bad5,971.17

avg incumbent reviews — the moat a new listing must climb

Is l citrulline profitable on Amazon?

According to Flapen's Amazon United States niche tracking, l citrulline is a $4.3M/yr Amazon United States market (1.6M searches/yr). The top 5 brands hold 72% of demand. Verdict: Worth a look — 66/100.

Data updated Jul 10, 2026 · scored weekly · How we score niches

l citrulline market size & sales

Units sold, revenue, conversion and listing quality across the tracked shelf.

Units sold / yr: 150K–200K; avg 5,000–6,000/product
Revenue / yr: $3.7M–$4.9M; units × avg price
Conversion rate: 11.0%
Avg BSR: #245
Page quality: 0%
Prime: 100%
Sponsored: 90%
Out of stock: 1.5%
Avg brand age: 64 months
Avg seller age: 144 days

Competition: brands, sellers & click share

The top 5 products take 47% of clicks — established leaders, but buyers still shop beyond them.

Brands

17 rising

Sellers

Top-5 brand share

72%

Top 20: 100%

Top-5 click share

47%

Top 20: 91%

Open market

23%

Nutricost32%
BulkSupplements15%
DORADO NUTRITION13%
Kaged7%
NOW Foods5%
HAVASU NUTRITION5%

l citrulline demand & seasonality

Weekly Amazon search volume, last 102 weeks — -1.8% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.5×

Open Trend

Top l citrulline search terms shoppers use

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

l citrulline582K/yr +0.1%7.8% conv.
l-citrulline339K/yr -6.5%8.1% conv.
citrulline265K/yr -7.5%6.7% conv.
l-citrulline for men80K/yr +8.5%7.5% conv.
l citrulline supplements for men87K/yr -21.3%6.8% conv.
l citrulline capsules40K/yr +34.2%6.8% conv.
citrulina28K/yr +46.8%2.1% conv.
citrulina for men13K/yr +83.3%2.6% conv.
l citruline16K/yr +6.7%8.2% conv.
citruline15K/yr +0.8%6.8% conv.

All search terms

Top l citrulline 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.

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

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Nutricost L-Citrulline 2500mg Per Serving 60 Servings 1250mg Per Tablet 120 Tabs - Non-GMO and Gluten Free Supplement

Nutricost$19.624.6★1,055 rev

L Citrulline 3000mg Supplement (240 Capsules) Support L Arginine & Nitric Oxide Pills - L-Citrulline For Men & Women - Muscle Recovery & Pump Supplement - 3rd Party Tested Vegan Non-GMO - USA Made

DORADO NUTRITION$17.894.5★1,894 rev

Nutricost Pure L-Citrulline (Base) Powder (600 Grams)

Nutricost$29.474.7★3,343 rev

Kaged$16.364.7★289 rev

Nutricost L-Citrulline 500mg 120 Capsules - Gluten Free Non-GMO 1000mg Per Serving (60 Serv)

Nutricost$12.934.5★8,765 rev

Newest

by launch date

Formulation Factory Heart of Steel Nitric Oxide Supplements for Men & Women Nitric Oxide Booster for Blood Flow & Circulation with L-Citrulline 1000mg L-Arginine CoQ10 & Resveratrol - 120 Capsules

Formulation Factory$55.59665 rev

1y ago

Nugenix Essentials L-Citrulline Supplement for Enhanced Blood Flow and Performance - 1500 mg 60 Capsules

Nugenix$14.64288 rev

1y ago

Carlyle$10.101,380 rev

2y ago

L Citrulline 3000mg Supplement (240 Capsules) Support L Arginine & Nitric Oxide Pills - L-Citrulline For Men & Women - Muscle Recovery & Pump Supplement - 3rd Party Tested Vegan Non-GMO - USA Made

DORADO NUTRITION$17.891,894 rev

2y ago

Primaforce L-Citrulline 3000mg 240 Capsules 60 Servings

Primaforce$21.17152 rev

3y ago

What reviews say buyers love and hate about l citrulline

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

What buyers love

Quality-Overall18%

“Excellent product”

Value For Money8%

“Fair price”

Energy Level7%

“it really boosts my energy”

Blood Pressure6%

“Great BP support”

Vitamin6%

“Excellent Supplement”

Advertised Vs Actual Product4%

“AS DESCRIBED”

Efficiency4%

“Effective”

Heart Health4%

“I like that it supports heart health”

Ingredients-Overall3%

“clean ingredients”

Nutritional Content3%

“Easy Addition to My Daily Wellness Routine”

What buyers complain about

Functionality-Overall11%

“Didn't work”

Taste-Overall9%

“The taste was extremely bitter”

Value For Money6%

“Waste of money”

Quality-Overall5%

“definitely poor quality controls”

Side Effects5%

“Avoid - bad side effects”

Dosage4%

“fails to tell you it takes 4 capsules to equal that dose”

Size-Overall3%

“These are way too big”

Vitamin3%

“All vitamin supplements are a bit over priced”

Ingredients-Overall3%

“but lo and behold when I re-read the ingredients in the new bottle I immediately cancelled it”

Advertised Vs Actual Product2%

“It seems deceiving to me”

Top return reasons

Advertised Vs Actual Product25%

Size-Overall17%

Leak-Proof17%

Quality-Overall17%

Certifications17%

Side Effects8%

Common l citrulline questions

Is l citrulline profitable to sell on Amazon United States?: The niche generates $4.3M/yr across 29 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is -1.8%. Flapen's verdict: Worth a look (66/100).
How competitive is the l citrulline niche?: 17 brands and 30 sellers compete. The top 5 products take 47% of clicks and top 5 brands hold 72% of demand.
What do buyers complain about in l citrulline?: Top complaints mined from reviews: Functionality-Overall, Taste-Overall, Value For Money. The return rate is 0.0%.
When does demand for l citrulline peak?: Demand is steady year-round — the busiest month runs 1.5× the quietest.
What does it cost to enter the l citrulline niche?: Listings span $10.10–$76.27; the average listing price is $24.70 (sweet spot $15–$100). The average incumbent carries 5,971 reviews — the moat a new listing must climb.