---
title: "L Theanine 100 Mg — $41K/mo Amazon US Product Research"
canonical_url: "https://flapen.com/research/us/health-household/l-theanine-100-mg"
last_updated: "2026-08-12T15:07:47.173Z"
locale: en
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description: "Amazon product research for l theanine 100 mg: $41K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for l theanine 100 mg: $41K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "L Theanine 100 Mg — $41K/mo Amazon US Product Research"
---
# **L Theanine 100 Mg**
**Worth a look**
Shows low returns (0.0%), but soft demand (-3.2% this quarter) keeps it on the watch list.
Market size 59Growth 23Conversion 96Competition 34Returns 100Price range 87Avg price 85Brand share 38Review moat 25Quality gap 27
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****13.1%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Great****$9.86–$62.51**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Great****$19.08**
avg listing price — sweet spot $15–$100
**Market size**
**Good****$492K**
$492K/yr · 197K searches
**Brand share**
**Okay****82%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****65%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****4,661.12**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Bad****-3.2%**
90-day search growth — must beat 0% to launch
## **Is l theanine 100 mg profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, l theanine 100 mg is a $492K/yr Amazon United States market (197K searches/yr). The top 5 brands hold 82% of demand. Demand peaks in Jun–Jul. Verdict: Worth a look — 53/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **l theanine 100 mg market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **25K–30K**
- avg 1,250–1,500/product
- **Revenue / yr**
- **$477K–$572K**
- units × avg price
- **Conversion rate**
- **13.1%**
- **Avg BSR**
- **#824**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **65%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **68 months**
- **Avg seller age**
- **161 days**
## **Competition: brands, sellers & click share**
The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▲rising
**Sellers**
**541**
**Top-5 brand share**
**82%**
Top 20: 100%
**Top-5 click share**
**65%**
Top 20: 100%
**Open market**
**15%**
- NOW Foods61% - Integrative Therapeutics6% - Jarrow Formulas6% - Nutricost5% - Life Extension4% - 365 by Whole Foods Market3% - Open — no brand owns it (7 brands, 15%)
## **l theanine 100 mg demand & seasonality**
Weekly Amazon search volume, last 98 weeks — -3.2% search growth over the last 90 days.
5K3KSpike '24Holiday '24Spike '25Prime Day '25Holiday '25Spike '26 seasonDecMarJunAugNovMarMay
Peak months: Jun, Jul · busiest ÷ quietest = 3.0×
[**Open Trend **](https://flapen.com/research/us/health-household/l-theanine-100-mg/trend)
## **Top l theanine 100 mg search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **l theanine 100 mg**45K/yr-12.4%10.9% conv. - **l-theanine 100 mg**41K/yr-1.2%10.0% conv. - **now l theanine**23K/yr-6.0%14.8% conv. - **l theanine 100mg**12K/yr+1.6%9.0% conv. - **l theanine now**12K/yr-6.0%14.5% conv. - **now foods l-theanine**7K/yr+0.2%14.8% conv. - **l-theanine 100mg**8K/yr+10.2%10.7% conv. - **now l-theanine 200 mg**4K/yr+120.1%20.3% conv. - **now l-theanine**7K/yr+2.8%15.6% conv. - **l-theanine now**5K/yr+4.1%17.5% conv. [**All search terms **](https://flapen.com/research/us/health-household/l-theanine-100-mg/search-terms)
## **Top l theanine 100 mg 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%$49K20%$98K30%$148K40%$197K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 17 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**NOW Foods Supplements L-Theanine 100 mg with Decaf Green Tea Stress Management* 90 Veg Capsules**NOW Foods**$12.42**4.6★2,802 rev](https://www.amazon.com/dp/B0013OXESM) [2**NOW Foods L-Theanine Double Strength 200 mg Per Cap - 180 Veg Capsules - Enhanced with 100mg Inositol - Vegetarian Non-GMO - Ltheanine 200mg Supplement**NOW Foods**$29.97**4.8★854 rev](https://www.amazon.com/dp/B0BTRYDKLV) [3**NOW Foods Supplements L-Theanine 200 mg with Inositol Stress Management* 60 Veg Capsules**NOW Foods**$14.43**4.7★7,357 rev](https://www.amazon.com/dp/B000H7P9M0) [4**NOW Foods Supplements L-Theanine 200 mg with Inositol Stress Management* 120 Veg Capsules**NOW Foods**$21.29**4.7★7,357 rev](https://www.amazon.com/dp/B00GQV9YX6) [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**$21.08**4.6★1,626 rev](https://www.amazon.com/dp/B0036H0CV6)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**NOW Foods L-Theanine Double Strength 200 mg Per Cap - 180 Veg Capsules - Enhanced with 100mg Inositol - Vegetarian Non-GMO - Ltheanine 200mg Supplement**NOW Foods**$29.97**854 rev3y ago](https://www.amazon.com/dp/B0BTRYDKLV) [**SOS L-Theanine Brain Support Focus Supplement 100mg 120 Count**Supplement Outlet Store**$12.61**238 rev5y ago](https://www.amazon.com/dp/B08F94R65Q) [**Whole Foods Market L-Theanine 100 MCG 60 CT**365 by Whole Foods Market**$13.26**209 rev8y ago](https://www.amazon.com/dp/B074J75HR8) [**PureFormulas L Theanine Supplement 100 mg L-Theanine Supports Stress Levels Relaxed State Mood Sleep Dairy Free Soy Free Non-GMO 60 Vegetarian Capsules**PureFormulas**$15.79**96 rev9y ago](https://www.amazon.com/dp/B0CQGGP2HK) [**Healthy Origins L-Theanine AlphaWave 100 mg 180 Veggie Caps**Healthy Origins**$19.85**250 rev9y ago](https://www.amazon.com/dp/B01MZ87N92)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**NOW Foods Supplements L-Theanine 200 mg with Inositol Stress Management* 120 Veg Capsules**NOW Foods**$21.29**4.7★**▲ 60%**](https://www.amazon.com/dp/B00GQV9YX6) [**Pure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation Stress & Nervous System* - 60 Capsules**Pure Encapsulations**$62.51**4.7★**▲ 30%**](https://www.amazon.com/dp/B0016CXZJO) [**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**$21.08**4.6★**▲ 19%**](https://www.amazon.com/dp/B0036H0CV6) [**Healthy Origins L-Theanine AlphaWave 100 mg 180 Veggie Caps**Healthy Origins**$19.85**4.7★**— 6%**](https://www.amazon.com/dp/B01MZ87N92) [**Nutricost L-Theanine 200mg 120 Capsules Double Strength Gluten Free**Nutricost**$11.91**4.6★**— 6%**](https://www.amazon.com/dp/B01B3RWQNM)
**~~View all trending →~~**
## **What reviews say buyers love and hate about l theanine 100 mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**17%
*“Helps Me Sleep”*
**Quality-Overall**12%
*“Good quality and trusted brand”*
**Focus Enhancement**10%
*“Improves focus and memory”*
**Stress/Anxiety**10%
*“Helps with my anxiety”*
**Soothing Effect**6%
*“It relaxes me”*
**Efficiency**5%
*“Effective”*
**Value For Money**5%
*“Best value”*
**Vitamin**4%
*“Great vitamin supplement”*
**Advertised Vs Actual Product**3%
*“As described”*
**Side Effects**2%
*“No drowsiness, no weird side effects—just a smooth, steady feeling”*
### **What buyers complain about **
**Functionality-Overall**12%
*“No Results”*
**Sleep Quality**8%
*“Sleep aid not worth buying”*
**Stress/Anxiety**8%
*“I gave me anxiety”*
**Dosage**6%
*“No one should ever take this high of a dose of this”*
**Side Effects**5%
*“Could be just the placebo affect”*
**Value For Money**3%
*“It is more expensive”*
**Ingredients-Overall**3%
*“A bit disappointing because I thought Id found a reasonable source of suntheanine”*
**Taste-Overall**3%
*“there was no taste with the capsules”*
**Allergies**2%
*“Had a bad reaction to this product”*
**Focus Enhancement**2%
*“I did not feel any different in focus and relaxation”*
### **Top return reasons **
**Functionality-Overall**33%
**Ingredients-Overall**25%
**Value For Money**17%
**Magnesium**8%
**Advertised Vs Actual Product**8%
**Dosage**4%
**Size-Overall**4%
## **Common l theanine 100 mg questions**
- **Is l theanine 100 mg profitable to sell on Amazon United States?**
- The niche generates $492K/yr across 17 tracked products. 90-day search growth is -3.2%. Flapen's verdict: Worth a look (53/100).
- **How competitive is the l theanine 100 mg niche?**
- 13 brands and 541 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 82% of demand.
- **What do buyers complain about in l theanine 100 mg?**
- Top complaints mined from reviews: Functionality-Overall, Sleep Quality, Stress/Anxiety. The return rate is 0.0%.
- **When does demand for l theanine 100 mg peak?**
- Demand peaks in Jun–Jul; the busiest month runs 3.0× the quietest.
- **What does it cost to enter the l theanine 100 mg niche?**
- Listings span $9.86–$62.51; the average listing price is $19.08 (sweet spot $15–$100). The average incumbent carries 4,661 reviews — the moat a new listing must climb.
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