---
title: "Caffeine L Theanine — $347K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/caffeine-l-theanine"
last_updated: "2026-08-10T14:31:08.575Z"
locale: en
meta:
description: "Niche score 50/100 · $347K/yr market · 173K searches/yr. A concentrated shelf (top 5 take 86% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · $347K/yr market · 173K searches/yr. A concentrated shelf (top 5 take 86% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Caffeine L Theanine — $347K/yr Amazon US Niche (2026) - Flapen"
---
# **caffeine l theanine**
**Worth a look**
Shows low returns (0.0%), but a concentrated shelf (top 5 take 86% of clicks) keeps it on the watch list.
Market size 53Growth 25Conversion 89Competition 12Returns 100Price range 73Avg price 86Brand share 22Review moat 26Quality gap 58
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****10.4%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$19.20**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$9.96–$28.42**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Market size**
**Good****$347K**
$347K/yr · 173K searches
**Review moat**
**Okay****3,910**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Okay****+0.2%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****91%**
top-5 brand share — brand-locked demand
**Competition**
**Bad****86%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United States niche tracking, caffeine l theanine is a $347K/yr Amazon United States market (173K searches/yr). The top 5 brands hold 91% of demand. Verdict: Worth a look — 50/100.
Data updated Jul 8, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **caffeine l theanine market data**
- **Units sold / yr**
- **15K–20K**
- avg 1,500–2,000/product
- **Revenue / yr**
- **$288K–$384K**
- units × avg price
- **Conversion rate**
- **10.4%**
- **Avg BSR**
- **#439**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **59 months**
- **Avg seller age**
- **157 days**
## **Competition & brand share**
The top 5 products capture 86% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**8 **▼falling
**Sellers**
**14**
**Top-5 brand share**
**91%**
Top 20: 100%
**Top-5 click share**
**86%**
Top 20: 100%
**Open market**
**5%**
- Nutricost37% - Sports Research22% - Vitamatic17% - SmarterVitamins10% - Eu Natural6% - NutraChamps3% - Open — no brand owns it (2 brands, 5%)
## **Demand & seasonality**
Weekly Amazon search volume, last 100 weeks — +0.2% search growth over the last 90 days.
5K3KSpike '24Black Friday '24Spike '25Prime Day '25Spike '26 seasonDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/health-household/caffeine-l-theanine/trend)
## **Top caffeine l theanine search terms**
- **caffeine l theanine pills**29K/yr+17.1%10.4% conv. - **caffeine l theanine**17K/yr+7.5%8.0% conv. - **l theanine caffeine**19K/yr-10.6%7.4% conv. - **caffeine and l theanine**11K/yr+9.1%8.7% conv. - **caffeine pills with l-theanine**10K/yr-9.6%10.2% conv. - **l theanine and caffeine**12K/yr+2.4%6.4% conv. - **caffeine and l theanine pills**9K/yr+6.5%8.8% conv. - **caffeine with l-theanine**8K/yr+1.4%11.5% conv. - **l-theanine caffeine**8K/yr-15.3%6.3% conv. - **caffeine theanine**7K/yr-6.1%10.5% conv. [**All search terms **](https://flapen.com/research/us/health-household/caffeine-l-theanine/search-terms)
## **Top caffeine l theanine products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$35K20%$69K30%$104K40%$139K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 10 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Nutricost Caffeine with L-Theanine 100mg of Each 240 Capsules 240 Servings - Non-GMO and Gluten Free**Nutricost**$13.86**4.5★2,396 rev](https://www.amazon.com/dp/B08YJ9QHG2) [2**Sports Research L-Theanine Supplement with Caffeine & Coconut MCT Oil - Focused Energy Alertness & Relaxation Without Drowsiness - 200mg L Theanine 100mg Organic Caffeine - 60 Liquid Softgels**Sports Research**$21.88**4.5★3,550 rev](https://www.amazon.com/dp/B07MQWJYJ3) [3**Vitamatic L-Theanine 200mg with Caffeine 100mg 120 Vegetarian Tablets Nootropic Supplement for Focused Energy & Mental Clarity**Vitamatic**$9.96**4.5★412 rev](https://www.amazon.com/dp/B09PK3JJN7) [4**SmarterVitamins 200mg Caffeine Pills - MCT Oil from 100% Coconuts + 100mg L-Theanine Energy and Focus Extended Release Capsule 50 Liquid Softgels**SmarterVitamins**$28.42**4.3★11,341 rev](https://www.amazon.com/dp/B07FP4KS3R) [5**Eu Natural Elite Caffeine Pills with L-Theanine - 100mg Caffeine + 200mg L-Theanine - Jitter-Free Focused Energy & Clean Nootropic Stack - 120 Soft Capsules**Eu Natural**$19.62**4.2★3,162 rev](https://www.amazon.com/dp/B00U0DL5O2)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Caffeine Pills with L-Theanine - 180 Energy Pills for Women & Men - Clean & Long-Lasting Focused Energy - Sustained Release 100mg Caffeine + 200mg L Theanine - No Crash Capsules Vegan Supplement**NutraChamps**$19.84**93 rev6mo ago](https://www.amazon.com/dp/B0FGQYWL4Y) [**Vitamatic L-Theanine 200mg with Caffeine 100mg 120 Vegetarian Tablets Nootropic Supplement for Focused Energy & Mental Clarity**Vitamatic**$9.96**412 rev4y ago](https://www.amazon.com/dp/B09PK3JJN7) [**Vitamatic Caffeine Pills with L-Theanine 300 mg Per Tablet 120 Vegetarian Tablets (Pack of 2 Total 240 Tablets)**Vitamatic**$18.31**412 rev4y ago](https://www.amazon.com/dp/B0BDYJ3FZ1) [**Nutricost Caffeine with L-Theanine 100mg of Each 240 Capsules 240 Servings - Non-GMO and Gluten Free**Nutricost**$13.86**2,396 rev5y ago](https://www.amazon.com/dp/B08YJ9QHG2) [**Sports Research L-Theanine Supplement with Caffeine & Coconut MCT Oil - Focused Energy Alertness & Relaxation Without Drowsiness - 200mg L Theanine 100mg Organic Caffeine - 60 Liquid Softgels**Sports Research**$21.88**3,550 rev7y ago](https://www.amazon.com/dp/B07MQWJYJ3)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Vitamatic Caffeine Pills with L-Theanine 300 mg Per Tablet 120 Vegetarian Tablets (Pack of 2 Total 240 Tablets)**Vitamatic**$18.31**4.5★**▲ 65%**](https://www.amazon.com/dp/B0BDYJ3FZ1) [**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**$18.87**4.5★**▲ 50%**](https://www.amazon.com/dp/B00TXY32FY) [**Vitamatic L-Theanine 200mg with Caffeine 100mg 120 Vegetarian Tablets Nootropic Supplement for Focused Energy & Mental Clarity**Vitamatic**$9.96**4.5★**▲ 47%**](https://www.amazon.com/dp/B09PK3JJN7) [**Nootropics Depot Caffeine and L-Theanine Capsules | 60 Pills | Contains 100mg of Caffeine and 200mg of L-Theanine | Natural Supplement | Energy Booster | Mental Focus + Alertness | Coffee Alternative**Nootropics Depot**$19.05**4.3★**▲ 36%**](https://www.amazon.com/dp/B01B6E2JPC) [**SmarterVitamins 200mg Caffeine Pills - MCT Oil from 100% Coconuts + 100mg L-Theanine Energy and Focus Extended Release Capsule 50 Liquid Softgels**SmarterVitamins**$28.42**4.3★**— 7%**](https://www.amazon.com/dp/B07FP4KS3R)
**~~View all trending →~~**
## **What buyers say about caffeine l theanine**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Energy Level**14%
*“Lots of energy”*
**Focus Enhancement**13%
*“Improves focus and memory”*
**Quality-Overall**10%
*“Good quality and trusted brand”*
**Caffeine Content**9%
*“Great Caffeine Capsules”*
**Sleep Quality**5%
*“Improved sleep”*
**Efficiency**5%
*“Very effective”*
**Vitamin**4%
*“Their vitamins are also the highest quality available”*
**Stress/Anxiety**4%
*“Its helped so much with anxiety attacks”*
**Value For Money**4%
*“great product for a good price”*
**Dosage**3%
*“Seems to be a good dosage”*
### **What buyers complain about **
**Sleep Quality**10%
*“Makes you very sleepy”*
**Functionality-Overall**10%
*“it didnt help”*
**Energy Level**9%
*“Does not give You Energy”*
**Dosage**6%
*“I cant distinguish if this level of dose is doing any thing”*
**Taste-Overall**5%
*“don't want to ingest milk, sugar, flavoring, and maybe don't even like the taste of coffee”*
**Stress/Anxiety**4%
*“without the jitters or increased anxiety”*
**Value For Money**4%
*“the value feel questionable”*
**Side Effects**3%
*“I will react with nausea or something else”*
**Stuck/Fused Together**2%
*“many of the capsules were clumped together”*
**Focus Enhancement**2%
*“I did not feel any different in focus and relaxation”*
### **Top return reasons **
**Advertised Vs Actual Product**30%
**Functionality-Overall**23%
**Ingredients-Overall**13%
**Value For Money**13%
**Strength**7%
**Smell**7%
**Side Effects**3%
**Dosage**3%
## **Common questions**
- **Is caffeine l theanine profitable to sell on Amazon United States?**
- The niche generates $347K/yr across 10 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +0.2%. Flapen's verdict: Worth a look (50/100).
- **How competitive is the caffeine l theanine niche?**
- 8 brands and 14 sellers compete. The top 5 products take 86% of clicks and top 5 brands hold 91% of demand.
- **What do buyers complain about in caffeine l theanine?**
- Top complaints mined from reviews: Sleep Quality, Functionality-Overall, Energy Level. The return rate is 0.0%.
- **When does demand for caffeine l theanine peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the caffeine l theanine niche?**
- Listings span $9.96–$28.42; the average listing price is $19.20 (sweet spot $15–$100). The average incumbent carries 3,910 reviews — the moat a new listing must climb.
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