---
title: "L Theanine — $1.5M/mo Amazon US Product Research (2026)"
canonical_url: "https://flapen.com/research/us/health-household/l-theanine"
last_updated: "2026-08-12T15:05:28.800Z"
locale: en
meta:
description: "Amazon product research for l theanine: $1.5M/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for l theanine: $1.5M/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "L Theanine — $1.5M/mo Amazon US Product Research (2026)"
---
# **L Theanine**
**Launch it**
A $17.6M/yr market growing +3.8% this quarter with returns at 0.0% — clears our launch bar.
Market size 100Growth 30Conversion 96Competition 48Returns 100Price range 88Avg price 95Brand share 69Review moat 24Quality gap 22
**Market size**
**Incredible****$17.6M**
$17.6M/yr · 5.2M searches
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****14.4%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Incredible****$23.66**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$9.86–$66.04**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****64%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****56%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Okay****+3.8%**
90-day search growth — must beat 0% to launch
**Review moat**
**Bad****5,311.14**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
## **Is l theanine profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, l theanine is a $17.6M/yr Amazon United States market (5.2M searches/yr). The top 5 brands hold 64% of demand. Verdict: Launch it — 66/100.
Data updated Jul 25, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **l theanine market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **600K–800K**
- avg 25,000–30,000/product
- **Revenue / yr**
- **$14.2M–$18.9M**
- units × avg price
- **Conversion rate**
- **14.4%**
- **Avg BSR**
- **#134**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **86%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **44 months**
- **Avg seller age**
- **144 days**
## **Competition: brands, sellers & click share**
The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**17 **—flat
**Sellers**
**571**
**Top-5 brand share**
**64%**
Top 20: 100%
**Top-5 click share**
**56%**
Top 20: 98%
**Open market**
**30%**
- Nutricost26% - Nature's Trove14% - Sports Research9% - NOW Foods8% - Pure Encapsulations6% - Integrative Therapeutics6%
## **l theanine demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +3.8% search growth over the last 90 days.
125K75KBlack Friday '24Spike '25Prime Day '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/health-household/l-theanine/trend)
## **Top l theanine search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **l theanine**2.1M/yr+8.7%13.0% conv. - **l-theanine**1.1M/yr-0.1%12.0% conv. - **l theanine supplement**689K/yr-10.8%10.8% conv. - **ltheanine**272K/yr+9.7%11.4% conv. - **l-theanine 200mg**183K/yr+4.9%16.4% conv. - **theanine**195K/yr-2.0%13.8% conv. - **l theanine 200mg**122K/yr+14.9%13.9% conv. - **l-theanine 400mg**75K/yr+63.9%9.3% conv. - **l theanine 400mg**46K/yr+94.8%9.3% conv. - **theanine supplement**56K/yr-4.1%10.3% conv. [**All search terms **](https://flapen.com/research/us/health-household/l-theanine/search-terms)
## **Top l theanine 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%$1.8M20%$3.5M30%$5.3M40%$7.0M1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 22 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Nutricost L-Theanine 200mg 120 Capsules Double Strength Gluten Free**Nutricost**$11.91**4.6★9,940 rev](https://www.amazon.com/dp/B01B3RWQNM) [2**Natures Trove L-Theanine 200mg 120 Vegetarian Capsules**Nature's Trove**$9.86**4.6★27,416 rev](https://www.amazon.com/dp/B01D1YQBOK) [3**Sports Research Double Strength L-Theanine Supplement - Suntheanine Softgels for Focus Relaxation & Alertness - Non-Drowsy Support Made with Coconut Oil Non-GMO & Gluten Free - 200mg 60 Count**Sports Research**$19.05**4.5★15,233 rev](https://www.amazon.com/dp/B00TXY32FY) [4**Pure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation Stress & Nervous System* - 60 Capsules**Pure Encapsulations**$62.42**4.7★915 rev](https://www.amazon.com/dp/B0016CXZJO) [5**Integrative Therapeutics L-Theanine - Amino Acid Supplement for Stress & Relaxation Support* - Vegan Gluten-Free & Dairy-Free - Third-Party Tested - 60 Capsules (30 Servings)**Integrative Therapeutics**$21.06**4.6★1,618 rev](https://www.amazon.com/dp/B0036H0CV6)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Micro Ingredients L-Theanine 400mg 400 Softgels | Highly Bioavailable with Coconut Oil | Extra Strength Theanine Amino Acid | Calm & Relaxation Support + Focus Supplement | Non-GMO Gluten Free**Micro Ingredients**$24.58**261 rev1y ago](https://www.amazon.com/dp/B0F5S2PCLD) [**Extra Strength L-Theanine Supplement 400mg 400 Capsules (200mg Per Cap)**DEAL SUPPLEMENT**$16.13**436 rev1y ago](https://www.amazon.com/dp/B0F1BWQL3C) [**L-Theanine 200mg with Magnesium Glycinate 400 Coconut MCT Oil Softgels | 2-in-1 Amino Acid & Mineral Complex | Gentle Care All Day & Night**Micro Ingredients**$24.05**795 rev1y ago](https://www.amazon.com/dp/B0DK65BMV7) [**L Theanine 400 mg | L-Theanine Stress Relief | Extra Strength Supplement | Lab Tested | Relaxation Sleep & Calm Support | For Men & Women | Plant Based Non-GMO & Gluten-Free | 120 Vegan Capsules**NUTRAHARMONY**$18.65**2,155 rev3y ago](https://www.amazon.com/dp/B0C9N1Q5QS) [**BulkSupplements.com L-Theanine Capsules - L-Theanine Supplement L-Theanine 200mg Theanine Pills - Amino Amino Supplement Gluten Free - 1 Theanine Capsule per Serving 365 Capsules**BulkSupplements**$17.17**941 rev3y ago](https://www.amazon.com/dp/B0C5Y7Q9JH)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Micro Ingredients L-Theanine 400mg 400 Softgels | Highly Bioavailable with Coconut Oil | Extra Strength Theanine Amino Acid | Calm & Relaxation Support + Focus Supplement | Non-GMO Gluten Free**Micro Ingredients**$24.58**4.7★**▲ 53%**](https://www.amazon.com/dp/B0F5S2PCLD) [**MaryRuths L Theanine 200mg Liquid Drops | Mood Support for Adults & Kids | Focus Supplement | Natural Sleep Support | Vegan | Non-GMO | Gluten Free | 30 Servings**MARYRUTH'S**$19.96**4.7★**▲ 31%**](https://www.amazon.com/dp/B09YKGM7N5) [**Nutricost L-Theanine 200mg 120 Capsules Double Strength Gluten Free**Nutricost**$11.91**4.6★**▲ 27%**](https://www.amazon.com/dp/B01B3RWQNM) [**Pure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation Stress & Nervous System* - 60 Capsules**Pure Encapsulations**$62.42**4.7★**▲ 25%**](https://www.amazon.com/dp/B0016CXZJO) [**Life Extension L-Theanine Amino Acid theanine Calm Relaxation Mood Gluten-Free Non-GMO Vegetarian 200 mg 60 Capsules**Life Extension**$16.62**4.6★**▲ 25%**](https://www.amazon.com/dp/B00BSH7LXS)
**~~View all trending →~~**
## **What reviews say buyers love and hate about l theanine**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**20%
*“Helps with sleep”*
**Quality-Overall**14%
*“overall a solid and reliable product”*
**Stress/Anxiety**10%
*“Anxiety Relief”*
**Focus Enhancement**8%
*“Helps focus”*
**Value For Money**5%
*“Great Value”*
**Soothing Effect**5%
*“Helps calm”*
**Efficiency**5%
*“Effective”*
**Advertised Vs Actual Product**4%
*“Works as directed”*
**Vitamin**3%
*“these vitamins help me just as well”*
**Side Effects**2%
*“No side effect”*
### **What buyers complain about **
**Sleep Quality**12%
*“I still dont sleep”*
**Functionality-Overall**11%
*“Did not work”*
**Dosage**6%
*“No one should ever take this high of a dose of this”*
**Stress/Anxiety**5%
*“no relief of anxiety”*
**Side Effects**4%
*“Had unwanted side effects”*
**Taste-Overall**4%
*“it taste like throw up”*
**Size-Overall**4%
*“The capsule is small”*
**Value For Money**3%
*“It is more expensive”*
**Vitamin**2%
*“I honestly didnt expect a supplement to make such a noticeable difference”*
**Ease Of Chewing/Swallowing**2%
*“VERY DIFFICULT TO SWALLOW”*
### **Top return reasons **
**Functionality-Overall**37%
**Ingredients-Overall**15%
**Value For Money**12%
**Sleep Quality**6%
**Advertised Vs Actual Product**6%
**Dosage**6%
**Magnesium**6%
**Taste-Overall**4%
**Side Effects**3%
**Size-Overall**3%
## **Common l theanine questions**
- **Is l theanine profitable to sell on Amazon United States?**
- The niche generates $17.6M/yr across 22 tracked products. 90-day search growth is +3.8%. Flapen's verdict: Launch it (66/100).
- **How competitive is the l theanine niche?**
- 17 brands and 571 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 64% of demand.
- **What do buyers complain about in l theanine?**
- Top complaints mined from reviews: Sleep Quality, Functionality-Overall, Dosage. The return rate is 0.0%.
- **When does demand for l theanine peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the l theanine niche?**
- Listings span $9.86–$66.04; the average listing price is $23.66 (sweet spot $15–$100). The average incumbent carries 5,311 reviews — the moat a new listing must climb.
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