Is ornithine profitable to sell on Amazon United States?

The niche generates $115K/yr across 14 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +14.4%. Flapen's verdict: Worth a look (51/100).

How competitive is the ornithine niche?

9 brands and 22 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 87% of demand.

What do buyers complain about in ornithine?

Top complaints mined from reviews: Smell, Inflammation. The return rate is 0.1%.

When does demand for ornithine peak?

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

What does it cost to enter the ornithine niche?

Listings span $9.82–$39.44; the average listing price is $18.10 (sweet spot $15–$100). The average incumbent carries 436 reviews — the moat a new listing must climb.

ornithine

Worth a look

Shows low returns (0.1%), but a concentrated shelf (top 5 take 72% of clicks) keeps it on the watch list.

Returns

Incredible0.1%

return rate — above 5% kills the launch gate

Conversion

Incredible12.2%

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

Avg price

Great$18.10

avg listing price — sweet spot $15–$100

Price range

Great$9.82–$39.44

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

Review moat

Great436

avg incumbent reviews — the moat a new listing must climb

Growth

Okay+14.4%

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

Brand share

Okay87%

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

Market size

Okay$115K

$115K/yr · 52K searches

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Competition

Bad72%

top-5 click share — a locked-up shelf

According to Flapen's Amazon United States niche tracking, ornithine is a $115K/yr Amazon United States market (52K searches/yr). The top 5 brands hold 87% of demand. Verdict: Worth a look — 51/100.

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

ornithine market data

Units sold / yr: 5K–6K; avg 250–500/product
Revenue / yr: $91K–$109K; units × avg price
Conversion rate: 12.2%
Avg BSR: #708
Page quality: 0%
Prime: 100%
Sponsored: 79%
Out of stock: 0.0%
Avg brand age: 103 months
Avg seller age: 185 days

Competition & brand share

The top 5 products capture 72% of clicks — a locked-up shelf that new listings rarely crack.

Brands

9 rising

Sellers

Top-5 brand share

87%

Top 20: 100%

Top-5 click share

72%

Top 20: 100%

Open market

Nutricost31%
NOW Foods22%
BulkSupplements16%
Dr Clark Store12%
Amazing Nutrition6%
Horbäach5%
Open — no brand owns it (3 brands, 7%)

Demand & seasonality

Weekly Amazon search volume, last 97 weeks — +14.4% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.5×

Open Trend

Top ornithine search terms

l ornithine17K/yr +42.2%7.5% conv.
ornithine19K/yr +4.3%9.0% conv.
l-ornithine11K/yr +6.5%10.4% conv.
ornithine supplement6K/yr -12.7%12.6% conv.

All search terms

Top ornithine 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 14 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Nutricost L-Ornithine 500mg 180 Capsules - Non-GMO and Gluten Free

Nutricost$14.824.6★637 rev

NOW Foods Supplements L-Ornithine (L-Ornithine Hydrochloride) 500 mg Amino Acid 120 Veg Capsules

NOW Foods$14.794.7★1,584 rev

Dr Clark Ornithine Dietary Supplement 500mg 100 Gelatin Capsules Pure Amino Acid Support for Natural Sleep Aid Promotes Protein Metabolism Cleansing and Detoxification Non-GMO & Gluten Free

Dr Clark Store$18.904.6★448 rev

Nutricost L-Arginine L-Ornithine 750mg; 180 Capsules

Nutricost$16.734.6★1,464 rev

BulkSupplements.com L-Ornithine HCl Capsules (360 Count (Pack of 1)

BulkSupplements$19.764.6★54 rev

Newest

by launch date

Pure Encapsulations Growth Hormone Support - Arginine & Ornithine Amino Acid Blend - Supports Healthy Hormone Balance - Muscles & Training Support - Gluten-Free & Non-GMO - 90 Capsules

Pure Encapsulations$39.4429 rev

4mo ago

BulkSupplements.com L-Ornithine HCl Capsules (360 Count (Pack of 1)

BulkSupplements$19.7654 rev

1y ago

BulkSupplements.com L-Ornithine HCl Capsules - L-Ornithine Hydrochloride L-Ornithine 1000mg - Amino Acids Supplement Gluten Free 2 Capsules per Serving 180 Count (Pack of 1)

BulkSupplements$17.0254 rev

3y ago

Best Naturals L-Arginine L-Ornithine - 1000mg per Serving - 120 Tablets - Non-GMO & Gluten Free (120 Count (Pack of 1))

Best Naturals$9.82294 rev

3y ago

Pure Original Ingredients L-Ornithine (100 Capsules) Always Pure No Additives Or Fillers Lab Verified

PURE ORIGINAL INGREDIENTS$11.0245 rev

4y ago

What buyers say about ornithine

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

What buyers love

Quality-Overall21%

“Good product”

Vitamin19%

“Great supplement”

Sleep Quality13%

“It works for sleep”

Advertised Vs Actual Product9%

“As advertised”

Taste-Overall7%

“No taste or odor and has helped me replace my sleeping and anxiety meds”

Nutritional Content3%

“I will definitely keep taking this product as long as I am on a high protein diet”

Ingredients-Overall3%

“Best clean ingredients”

Contamination Free3%

“not have contamination”

Size-Overall2%

“thinner so it fits in my circular Lazy Susan lol”

Heart Health2%

“Good sleep, good for heart”

What buyers complain about

Smell25%

“The real deal should have almost no smell”

Inflammation17%

“I can feel the inflammation going down”

Top return reasons

Value For Money100%

Common questions

Is ornithine profitable to sell on Amazon United States?: The niche generates $115K/yr across 14 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +14.4%. Flapen's verdict: Worth a look (51/100).
How competitive is the ornithine niche?: 9 brands and 22 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 87% of demand.
What do buyers complain about in ornithine?: Top complaints mined from reviews: Smell, Inflammation. The return rate is 0.1%.
When does demand for ornithine peak?: Demand is steady year-round — the busiest month runs 1.5× the quietest.
What does it cost to enter the ornithine niche?: Listings span $9.82–$39.44; the average listing price is $18.10 (sweet spot $15–$100). The average incumbent carries 436 reviews — the moat a new listing must climb.