Leucine
Worth a lookShows 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
Avg price
Incredible$23.91avg listing price — sweet spot $15–$100
Price range
Great$13.21–$53.21cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great9.2%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
Okay1,603.07avg incumbent reviews — the moat a new listing must climb
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Brand share
Okay88%top-5 brand share — brands hold most of the demand
Competition
Bad76%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
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.Peak months: Jul · busiest ÷ quietest = 1.7×
Top leucine search terms shoppers use
The exact queries shoppers type, with yearly volume, growth and conversion.- leucine128K/yr
- leucine supplements58K/yr
- l leucine25K/yr
- l-leucine23K/yr
- leucine and velositol supplement6K/yr
- lucine amino acids supplement13K/yr
- leucine amino acids supplement4K/yr
- leucine amino acid14K/yr
- leucine capsules15K/yr
- leucina12K/yr
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.
All 14 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Nutricost L-Leucine 2 000mg 120 Vegetarian Capsules Gluten-Free
Nutricost$13.794.6★1,572 rev
Nutricost Pure L-Leucine Powder 500 Grams
Nutricost$21.774.4★2,815 rev
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$19.424.2★401 rev
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$20.374.4★576 rev
Nutricost L-Isoleucine 2000mg Per Serving 240 Capsules (60 Servings)
Nutricost$15.754.6★545 rev
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$13.2139 rev
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$28.21870 rev
Nutricost L-Leucine 2 000mg 120 Vegetarian Capsules Gluten-Free
Nutricost$13.791,572 rev
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$19.42401 rev
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$44.693,615 rev
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$19.594.3★
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$44.694.5★
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$28.214.5★
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$18.764.6★
Life Extension Branched Chain Amino Acids (BCAAs) leucine isoleucine valine Promotes Muscle Recovery After Exercise Gluten-Free Non-GMO 90 Capsules
Life Extension$13.894.6★
What reviews say buyers love and hate about leucine
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent product”
“does help with muscle recovery”
“Great deal”
“As advertised”
“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”
“Body health, perfect aminos, an awesome source of protein”
“Effective right away”
“it gave me instant energy”
“Ease of use”
“All Pure Encapsulations products are top tier”
What buyers complain about
“Bitter tasting”
“both containers smelled really bad”
“expensive”
“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”
“It made me sick with stomach cramps, and diarrhea, and there is no refund”
“gagging trying to swallow”
“Made me sick”
“Didnt work for me”
“adding this many calories isn't going to be for everyone”
“Does not mix well with liquids”
Top return reasons
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.