L Carnitine 500mg
Worth a lookShows low returns (0.0%), but a small market ($66K/yr) keeps it on the watch list.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Incredible12.8%search→purchase rate — share of searches ending in a sale
Avg price
Incredible$25.69avg listing price — sweet spot $15–$100
Price range
Great$8.89–$76.50cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Okay1,669.25avg incumbent reviews — the moat a new listing must climb
Competition
Okay58%top-5 click share — leaders hold, buyers still browse
Brand share
Okay78%top-5 brand share — brands hold most of the demand
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Growth
Bad-7.3%90-day search growth — must beat 0% to launch
Market size
Bad$66K$66K/yr · 20K searches
Is l carnitine 500mg profitable on Amazon?
According to Flapen's Amazon United States niche tracking, l carnitine 500mg is a $66K/yr Amazon United States market (20K searches/yr). The top 5 brands hold 78% of demand. Demand peaks in Jul–Aug. Verdict: Worth a look — 51/100.
Data updated Jul 10, 2026 · scored weekly · How we score niches
l carnitine 500mg market size & sales
Units sold, revenue, conversion and listing quality across the tracked shelf.- Units sold / yr
- 3K–4K
- avg 100–250/product
- Revenue / yr
- $77K–$103K
- units × avg price
- Conversion rate
- 12.8%
- Avg BSR
- #140
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 65%
- Out of stock
- 0.0%
- Avg brand age
- 127 months
- Avg seller age
- 196 days
Competition: brands, sellers & click share
The top 5 products take 58% of clicks — established leaders, but buyers still shop beyond them.Brands
13 falling
Sellers
550
Top-5 brand share
78%
Top 20: 100%
Top-5 click share
58%
Top 20: 100%
Open market
17%
- NOW Foods40%
- Nutricost15%
- Nature's Bounty13%
- Life Extension5%
- Horbäach5%
- Pure Encapsulations4%
- Open — no brand owns it (7 brands, 17%)
l carnitine 500mg demand & seasonality
Weekly Amazon search volume, last 98 weeks — -7.3% search growth over the last 90 days.Peak months: Jul, Aug · busiest ÷ quietest = 1.5×
Top l carnitine 500mg 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.
All 20 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
NOW Foods Supplements L-Carnitine 500mg Purest Form Amino Acid Fitness Support* 60 Veg Capsules
NOW Foods$14.724.6★2,302 rev
Natures Bounty L-Carnitine Supports Heart Health & Fat Metabolism Amino Acid Supplement 500 mg 30 Tablets
Nature's Bounty$11.054.6★1,964 rev
Nutricost Acetyl L-Carnitine (ALCAR) 500mg 180 Capsules 180 Servings - Non-GMO and Gluten Free 1 Capsule per Serving
Nutricost$18.474.6★6,240 rev
NOW Foods L-Carnitine 500 mg 240 Veg Caps - Fitness Support* - Purest Form - Non-GMO - Vegan/Vegetarian - 500mg Capsules - Amino Acid Health Supplement
NOW Foods$43.624.7★105 rev
Life Extension L-Carnitine 500 mg Energy Supplement Memory Supplement Free Form Amino Acid Nitric Oxide Support Healthy Blood Pressure Gluten-Free Non-GMO Vegetarian 30 Capsules
Life Extension$9.024.6★639 rev
Newest
by launch dateNOW Foods L-Carnitine 500 mg 240 Veg Caps - Fitness Support* - Purest Form - Non-GMO - Vegan/Vegetarian - 500mg Capsules - Amino Acid Health Supplement
NOW Foods$43.62105 rev
Horbach L Carnitine Supplement 500mg | 60 Capsules | as L-Carnitine L-Tartrate | Non-GMO and Gluten Free
Horbäach$8.89287 rev
BulkSupplements.com L-Carnitine 1000mg Capsules - Carnitine Supplement Amino Acid Supplement - Gluten Free 2 Capsules per Serving (1000mg) 240 Count (Pack of 1)
BulkSupplements$20.69330 rev
GNC L Carnitine 500mg Supplement Supports Muscle Recovery 120 Servings
GNC$38.66101 rev
Nutricost Acetyl L-Carnitine (ALCAR) 500mg 180 Capsules 180 Servings - Non-GMO and Gluten Free 1 Capsule per Serving
Nutricost$18.476,240 rev
Trending
90-day click momentumBulkSupplements.com L-Carnitine 1000mg Capsules - Carnitine Supplement Amino Acid Supplement - Gluten Free 2 Capsules per Serving (1000mg) 240 Count (Pack of 1)
BulkSupplements$20.694.4★
NOW Foods Supplements L-Carnitine 500mg Purest Form Amino Acid Fitness Support* 180 Veg Capsules
NOW Foods$31.524.6★
GNC L Carnitine 500mg Supplement Supports Muscle Recovery 120 Servings
GNC$38.664.5★
Whole Foods Market Free-Form L-Carnitine 500mg Vegan 60 Count
365 by Whole Foods Market$16.124.5★
Pure Encapsulations Acetyl-L-Carnitine 500 mg - Memory & Brain Supplement - Brain Support & Focus* - Gluten Free & Non-GMO - 60 Capsules
Pure Encapsulations$76.504.6★
What reviews say buyers love and hate about l carnitine 500mg
What buyers praise and complain about, mined from review topics.What buyers love
“NOW brands are excellent”
“good value for the money”
“Moderately helps with weight loss”
“Great energy boost”
“Convenient way to buy vitamins”
“Muscle soreness also appears reduced”
“No side effects and easy to swallow”
“Nutricost made supplements affordable for me”
“dont have any weird aftertaste”
“Works great”
What buyers complain about
“Never worked”
“I could not tell any difference when taking these pills”
“Great product the only complaint is that the top of the capsule breaks really easily”
“larger capsules”
“Had bad side effects”
“Arterial Damage: Sustained, elevated TMAO levels over months or years are what actively accelerate artery clogging. atherosclerosis”
“Microbiome Shifts: Chronic supplementation actually alters your gut environment”
“In other words that misrepresentation at its best”
“But it triggered such painful intestinal spasms that I discontinued use”
“Made me anxious”
Top return reasons
Common l carnitine 500mg questions
- Is l carnitine 500mg profitable to sell on Amazon United States?
- The niche generates $66K/yr across 20 tracked products. 90-day search growth is -7.3%. Flapen's verdict: Worth a look (51/100).
- How competitive is the l carnitine 500mg niche?
- 13 brands and 550 sellers compete. The top 5 products take 58% of clicks and top 5 brands hold 78% of demand.
- What do buyers complain about in l carnitine 500mg?
- Top complaints mined from reviews: Functionality-Overall, Dosage, Durability. The return rate is 0.0%.
- When does demand for l carnitine 500mg peak?
- Demand peaks in Jul–Aug; the busiest month runs 1.5× the quietest.
- What does it cost to enter the l carnitine 500mg niche?
- Listings span $8.89–$76.50; the average listing price is $25.69 (sweet spot $15–$100). The average incumbent carries 1,669 reviews — the moat a new listing must climb.