---
title: "Leucine — $63K/mo Amazon US Product Research (2026)"
canonical_url: "https://flapen.com/research/us/health-household/leucine"
last_updated: "2026-08-12T16:24:13.635Z"
locale: en
meta:
description: "Amazon product research for leucine: $63K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for leucine: $63K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Leucine — $63K/mo Amazon US Product Research (2026)"
---
# **Leucine**
**Worth a look**
Shows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 71Growth 67Conversion 84Competition 20Returns 100Price range 91Avg price 95Brand share 28Review moat 49Quality gap 43
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Avg price**
**Incredible****$23.91**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$13.21–$53.21**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Great****9.2%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Good****$751K**
$751K/yr · 341K searches
**Growth**
**Good****+46.5%**
90-day search growth — must beat 0% to launch
**Review moat**
**Okay****1,603.07**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Okay****88%**
top-5 brand share — brands hold most of the demand
**Competition**
**Bad****76%**
top-5 click share — a locked-up shelf
## **Is leucine profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, leucine is a $751K/yr Amazon United States market (341K searches/yr). The top 5 brands hold 88% of demand. Demand peaks in Jul. Verdict: Worth a look — 61/100.
Data updated Jul 25, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **leucine market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **30K–40K**
- avg 2,500–3,000/product
- **Revenue / yr**
- **$717K–$956K**
- units × avg price
- **Conversion rate**
- **9.2%**
- **Avg BSR**
- **#257**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **93%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **71 months**
- **Avg seller age**
- **147 days**
## **Competition: brands, sellers & click share**
The top 5 products capture 76% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**10 **—flat
**Sellers**
**23**
**Top-5 brand share**
**88%**
Top 20: 100%
**Top-5 click share**
**76%**
Top 20: 100%
**Open market**
**9%**
- Nutricost57% - BulkSupplements17% - NutraBio7% - Pure Encapsulations5% - Life Extension3% - Double Wood Supplements3% - Open — no brand owns it (4 brands, 9%)
## **leucine demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +46.5% search growth over the last 90 days.
10K6KSpike '24Holiday '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jul · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/us/health-household/leucine/trend)
## **Top leucine search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **leucine**128K/yr+31.4%7.4% conv. - **leucine supplements**58K/yr+104.0%8.2% conv. - **l leucine**25K/yr+10.2%10.9% conv. - **l-leucine**23K/yr+18.1%9.8% conv. - **leucine and velositol supplement**6K/yr>1,000%2.1% conv. - **lucine amino acids supplement**13K/yr+32.7%6.6% conv. - **leucine amino acids supplement**4K/yr+389.1%7.4% conv. - **leucine amino acid**14K/yr-17.7%5.1% conv. - **leucine capsules**15K/yr-5.9%8.7% conv. - **leucina**12K/yr+11.5%2.2% conv. [**All search terms **](https://flapen.com/research/us/health-household/leucine/search-terms)
## **Top leucine 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.
0%10%$75K20%$150K30%$225K40%$301K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**Nutricost L-Leucine 2 000mg 120 Vegetarian Capsules Gluten-Free**Nutricost**$13.79**4.6★1,572 rev](https://www.amazon.com/dp/B0BLXDGBRN) [2**Nutricost Pure L-Leucine Powder 500 Grams**Nutricost**$21.77**4.4★2,815 rev](https://www.amazon.com/dp/B01BCNGPCU) [3**BulkSupplements.com L-Leucine Capsules - Leucine Supplements Leucine Amino Acid BCAA Supplements Leucine 5000mg - Gluten Free 10 Capsules per Serving - 30-Day Supply 300 Capsules**BulkSupplements**$19.42**4.2★401 rev](https://www.amazon.com/dp/B0BL1WJNCF) [4**NutraBio L-Leucine Supplement - Optimal Amino Acid for Muscle Growth & Recovery - Naturally Fermented Free Form Leucine Amino Acids Supplement- Vegan Non-GMO Gluten Free - 400mg 180 Capsules**NutraBio**$20.37**4.4★576 rev](https://www.amazon.com/dp/B09R4YG5HC) [5**Nutricost L-Isoleucine 2000mg Per Serving 240 Capsules (60 Servings)**Nutricost**$15.75**4.6★545 rev](https://www.amazon.com/dp/B06XZWV138)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Jacked Factory HMB + Leucine Capsules - L-Leucine 2g HMB 1g - Stimulate Muscle Growth Protect Lean Muscle Mass and Improve Athletic Performance - 180 Capsules**Jacked Factory**$13.21**39 rev5mo ago](https://www.amazon.com/dp/B0GJF6VPCM) [**Clean Nutraceuticals Amino Acids Supplement L-Lysine L-Threonine L-Leucine Isoleucine Valine L-Histidine L-Tryptophan L-Methionine L-Arginine L-Cysteine L-Glutamine L-Serine Aspartic Acid**Clean Nutraceuticals**$28.21**870 rev2y ago](https://www.amazon.com/dp/B0D71S86NT) [**Nutricost L-Leucine 2 000mg 120 Vegetarian Capsules Gluten-Free**Nutricost**$13.79**1,572 rev3y ago](https://www.amazon.com/dp/B0BLXDGBRN) [**BulkSupplements.com L-Leucine Capsules - Leucine Supplements Leucine Amino Acid BCAA Supplements Leucine 5000mg - Gluten Free 10 Capsules per Serving - 30-Day Supply 300 Capsules**BulkSupplements**$19.42**401 rev3y ago](https://www.amazon.com/dp/B0BL1WJNCF) [**BodyHealth PerfectAmino (150 ct) Easy to Swallow Tablets Essential Amino Acids Supplement with BCAAs Vegan Protein for Pre/Post Workout & Muscle Recovery with Lysine Tryptophan Leucine Methionine**BodyHealth**$44.69**3,615 rev4y ago](https://www.amazon.com/dp/B09SZQHYSL)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**BulkSupplements.com L-Leucine Powder - Leucine Supplements BCAA Supplements - Amino Acid Powder Unflavored 5g per Serving 250g (8.8 oz) (Pack of 1)**BulkSupplements**$19.59**4.3★**▲ 148%**](https://www.amazon.com/dp/B00GW5ZHI2) [**BodyHealth PerfectAmino (150 ct) Easy to Swallow Tablets Essential Amino Acids Supplement with BCAAs Vegan Protein for Pre/Post Workout & Muscle Recovery with Lysine Tryptophan Leucine Methionine**BodyHealth**$44.69**4.5★**▲ 84%**](https://www.amazon.com/dp/B09SZQHYSL) [**Clean Nutraceuticals Amino Acids Supplement L-Lysine L-Threonine L-Leucine Isoleucine Valine L-Histidine L-Tryptophan L-Methionine L-Arginine L-Cysteine L-Glutamine L-Serine Aspartic Acid**Clean Nutraceuticals**$28.21**4.5★**▲ 46%**](https://www.amazon.com/dp/B0D71S86NT) [**Essential Amino Acids - 1 Gram Per Serving Powder Blend of All 9 Essential Aminos (EAA) and All Branched-Chain Aminos (BCAAs) (Leucine Isoleucine Valine) 225 Capsules Gluten Free by Double Wood**Double Wood Supplements**$18.76**4.6★**▲ 30%**](https://www.amazon.com/dp/B0844KTVZN) [**Life Extension Branched Chain Amino Acids (BCAAs) leucine isoleucine valine Promotes Muscle Recovery After Exercise Gluten-Free Non-GMO 90 Capsules**Life Extension**$13.89**4.6★**▲ 23%**](https://www.amazon.com/dp/B0002C9RVE)
**~~View all trending →~~**
## **What reviews say buyers love and hate about leucine**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**22%
*“Excellent product”*
**Muscle Pain Relief**11%
*“does help with muscle recovery”*
**Value For Money**9%
*“Great deal”*
**Advertised Vs Actual Product**8%
*“As advertised”*
**Vitamin**7%
*“This vitamin is very good it helped me to label my amino acids no much side effects no bud taste no odor my energy label went up immediately”*
**Nutritional Content**4%
*“Body health, perfect aminos, an awesome source of protein”*
**Efficiency**4%
*“Effective right away”*
**Energy Level**4%
*“it gave me instant energy”*
**Ease Of Use**3%
*“Ease of use”*
**Ingredients-Overall**3%
*“All Pure Encapsulations products are top tier”*
### **What buyers complain about **
**Taste-Overall**13%
*“Bitter tasting”*
**Smell**11%
*“both containers smelled really bad”*
**Value For Money**5%
*“expensive”*
**Dosage**5%
*“False advertising, youd need to take at least 5 of these a day for anything meaningful, so one serving a day is hogwash and the price is rediculous to match that”*
**Acid Regulator/Stomach Ache Relief**5%
*“It made me sick with stomach cramps, and diarrhea, and there is no refund”*
**Ease Of Chewing/Swallowing**4%
*“gagging trying to swallow”*
**Side Effects**4%
*“Made me sick”*
**Functionality-Overall**4%
*“Didnt work for me”*
**Nutritional Content**4%
*“adding this many calories isn't going to be for everyone”*
**Solubility**3%
*“Does not mix well with liquids”*
### **Top return reasons **
**Taste-Overall**22%
**Ease Of Chewing/Swallowing**22%
**Ease Of Use**11%
**Regulates Digestion**11%
**Ingredients-Overall**11%
**Functionality-Overall**11%
**Side Effects**6%
**Acid Regulator/Stomach Ache Relief**6%
## **Common leucine questions**
- **Is leucine profitable to sell on Amazon United States?**
- The niche generates $751K/yr across 14 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +46.5%. Flapen's verdict: Worth a look (61/100).
- **How competitive is the leucine niche?**
- 10 brands and 23 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 88% of demand.
- **What do buyers complain about in leucine?**
- Top complaints mined from reviews: Taste-Overall, Smell, Value For Money. The return rate is 0.0%.
- **When does demand for leucine peak?**
- Demand peaks in Jul; the busiest month runs 1.7× the quietest.
- **What does it cost to enter the leucine niche?**
- Listings span $13.21–$53.21; the average listing price is $23.91 (sweet spot $15–$100). The average incumbent carries 1,603 reviews — the moat a new listing must climb.
## **Related niches to research next**
Same-category niches scoring near this one — the next ones worth researching.
- 76 [**cedar oil**](https://flapen.com/research/us/health-household/cedar-oil)$1.2M/yr+214.4%**Launch it**- 77 [**nutrapure glp1 cutting mix**](https://flapen.com/research/us/health-household/nutrapure-glp1-cutting-mix)$149K/yr+940.2%**Worth a look**- 77 [**dexcom g7**](https://flapen.com/research/us/health-household/dexcom-g7)$2.0M/yr+39.9%**Launch it**- 77 [**purelia**](https://flapen.com/research/us/health-household/purelia)$635K/yr+359.7%**Worth a look**- 77 [**graduation napkins**](https://flapen.com/research/us/health-household/graduation-napkins)$302K/yr+385.7%**Worth a look**- 77 [**credit card wand**](https://flapen.com/research/us/health-household/credit-card-wand)$418K/yr+101.3%**Worth a look**[**All Health & Household niches **](https://flapen.com/research/us/health-household)