---
title: "Suntheanine — $757K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/suntheanine"
last_updated: "2026-08-11T04:06:53.352Z"
locale: en
meta:
description: "Niche score 48/100 · $757K/yr market · 208K searches/yr · $28.36 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · $757K/yr market · 208K searches/yr · $28.36 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Suntheanine — $757K/yr Amazon US Niche (2026) - Flapen"
---
# **suntheanine**
**Skip it**
Soft demand (-43.0% this quarter) — this niche doesn't clear our bar today.
Market size 71Growth 3Conversion 96Competition 18Returns 100Price range 90Avg price 95Brand share 17Review moat 25Quality gap 28
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****12.8%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Incredible****$28.36**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$11.91–$66.04**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Good****$757K**
$757K/yr · 208K searches
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****4,617.08**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Bad****79%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****93%**
top-5 brand share — brand-locked demand
**Growth**
**Bad****-43.0%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, suntheanine is a $757K/yr Amazon United States market (208K searches/yr). The top 5 brands hold 93% of demand. Demand peaks in Feb–Mar–Apr. Verdict: Skip it — 48/100.
Data updated Jul 25, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **suntheanine market data**
- **Units sold / yr**
- **25K–30K**
- avg 3,000–4,000/product
- **Revenue / yr**
- **$709K–$851K**
- units × avg price
- **Conversion rate**
- **12.8%**
- **Avg BSR**
- **#261**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **69%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **74 months**
- **Avg seller age**
- **157 days**
## **Competition & brand share**
The top 5 products capture 79% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**8 **▼falling
**Sellers**
**43**
**Top-5 brand share**
**93%**
Top 20: 100%
**Top-5 click share**
**79%**
Top 20: 100%
**Open market**
**4%**
- Natural Factors38% - Sports Research34% - Doctor's BEST12% - Swanson5% - NOW Foods3% - Nutricost3% - Open — no brand owns it (2 brands, 4%)
## **Demand & seasonality**
Weekly Amazon search volume, last 101 weeks — -43.0% search growth over the last 90 days.
20K15KSpike '25Prime Day '25Black Friday '25Holiday '25Spike '26 seasonDecMarJunAugNovMarMay
Peak months: Feb, Mar, Apr · busiest ÷ quietest = 3.9×
[**Open Trend **](https://flapen.com/research/us/health-household/suntheanine/trend)
## **Top suntheanine search terms**
- **suntheanine**103K/yr-60.2%10.0% conv. - **suntheanine l-theanine**31K/yr-37.1%10.3% conv. - **sports research l theanine**24K/yr-6.0%13.4% conv. - **suntheanine l-theanine 200mg**10K/yr-10.8%10.3% conv. - **doctors best l theanine**8K/yr+8.3%14.2% conv. - **sports research l-theanine**7K/yr+10.7%14.6% conv. - **l theanine sports research**6K/yr+14.4%11.9% conv. - **l theanine suntheanine**7K/yr-9.0%8.0% conv. - **sun theanine**4K/yr-30.7%13.4% conv. - **sun theanine l-theanine**4K/yr-47.4%13.0% conv. [**All search terms **](https://flapen.com/research/us/health-household/suntheanine/search-terms)
## **Top suntheanine 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%$76K20%$151K30%$227K40%$303K1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 13 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Natural Factors Suntheanine L-Theanine 100 mg - Health Supplement for Calm Outlook - L-Theanine Supplement Supports Relaxing Sleep & Aids Against Drowsiness - 60 Chewable Tablets (30 Servings)**Natural Factors**$18.37**4.6★1,820 rev](https://www.amazon.com/dp/B000OEPAH0) [2**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) [3**Doctors Best L-Theanine Contains Suntheanine Helps Reduce Stress & Sleep Non-GMO Gluten Free Vegan 150 mg (DRB-00197) 90 Count**Doctor's BEST**$20.58**4.6★2,490 rev](https://www.amazon.com/dp/B001OXTGVG) [4**Natural Factors Suntheanine L-Theanine 100 mg - Health Supplement for Calm Outlook - L-Theanine Supplement Supports Relaxing Sleep & Aids Against Drowsiness - 120 Chewable Tablets (60 Servings)**Natural Factors**$34.90**4.6★1,820 rev](https://www.amazon.com/dp/B06XZ1WCL1) [5**Swanson Double Potency Suntheanine L-Theanine Calm and Focus Supplement for Stress-Prone Professionals Seeking Balanced Wellbeing - 200 mg (60 Veggie Capsules)**Swanson**$21.08**4.4★136 rev](https://www.amazon.com/dp/B00DECMJL4)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Doctors Best L-Theanine Caps 200mg for Men & Women - L Theanine AlphaWave Supplement for Calm & Focus Support Helps Reduce Stress Vegan Gluten Free Soy Free Non GMO - 60 Veg Capsules**Doctor's BEST**$15.60**288 rev2y ago](https://www.amazon.com/dp/B0D2LXVSSG) [**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 120 Count**Sports Research**$36.54**15,233 rev2y ago](https://www.amazon.com/dp/B0CH43ND14) [**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**$22.03**3,580 rev7y ago](https://www.amazon.com/dp/B07MQWJYJ3) [**Nutricost L-Theanine 200mg 120 Capsules Double Strength Gluten Free**Nutricost**$11.91**9,940 rev10y ago](https://www.amazon.com/dp/B01B3RWQNM) [**Natural Factors Suntheanine L-Theanine 100 mg - Health Supplement for Calm Outlook - L-Theanine Supplement Supports Relaxing Sleep & Aids Against Drowsiness - 120 Chewable Tablets (60 Servings)**Natural Factors**$34.90**1,820 rev10y ago](https://www.amazon.com/dp/B06XZ1WCL1)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Doctors Best L-Theanine Caps 200mg for Men & Women - L Theanine AlphaWave Supplement for Calm & Focus Support Helps Reduce Stress Vegan Gluten Free Soy Free Non GMO - 60 Veg Capsules**Doctor's BEST**$15.60**4.4★**▲ 80%**](https://www.amazon.com/dp/B0D2LXVSSG) [**Swanson Double Potency Suntheanine L-Theanine Calm and Focus Supplement for Stress-Prone Professionals Seeking Balanced Wellbeing - 200 mg (60 Veggie Capsules)**Swanson**$21.08**4.4★**▲ 62%**](https://www.amazon.com/dp/B00DECMJL4) [**THORNE - Theanine - 200 mg of L-Theanine - Supports a Healthy Stress Response Relaxation Focus Memory & Positive Mood - Increases Brain Alpha-Wave Production* - Third-Party Certified - 90 Capsules**THORNE**$66.04**4.7★**▲ 55%**](https://www.amazon.com/dp/B0797BLW59) [**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★**▲ 49%**](https://www.amazon.com/dp/B00TXY32FY) [**NOW Foods Supplements L-Theanine 200 mg with Inositol Stress Management* 120 Veg Capsules**NOW Foods**$21.33**4.7★**▲ 46%**](https://www.amazon.com/dp/B00GQV9YX6)
**~~View all trending →~~**
## **What buyers say about suntheanine**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**14%
*“Good quality and trusted brand”*
**Sleep Quality**14%
*“Helps with sleep”*
**Stress/Anxiety**11%
*“Works for stress”*
**Focus Enhancement**8%
*“Great for focus”*
**Efficiency**6%
*“Very effective”*
**Value For Money**4%
*“Worth it”*
**Vitamin**4%
*“Great effective supplement”*
**Soothing Effect**4%
*“good calming”*
**Taste-Overall**3%
*“no after taste”*
**Ease Of Chewing/Swallowing**3%
*“Not hard to swallow”*
### **What buyers complain about **
**Functionality-Overall**9%
*“Not effective”*
**Value For Money**7%
*“It is more expensive”*
**Stress/Anxiety**5%
*“Im struggling with terrible anxiety. GAD”*
**Taste-Overall**5%
*“Dont love the taste”*
**Dosage**4%
*“I may trying decreasing amount”*
**Sleep Quality**4%
*“Sleep aid not worth buying”*
**Focus Enhancement**3%
*“I did not feel any different in focus and relaxation”*
**Side Effects**3%
*“We experienced unpleasant side effects”*
**Artificial Sweeteners**3%
*“Added sugar artificial 3g per dose”*
**Quality-Overall**3%
*“garbage”*
### **Top return reasons **
**Functionality-Overall**30%
**Ingredients-Overall**20%
**Value For Money**10%
**Durability**5%
**Advertised Vs Actual Product**5%
**Strength**5%
**Dosage**5%
**Accuracy-Overall**5%
**Color**5%
**Quality-Overall**5%
## **Common questions**
- **Is suntheanine profitable to sell on Amazon United States?**
- The niche generates $757K/yr across 13 tracked products. 90-day search growth is -43.0%. Flapen's verdict: Skip it (48/100).
- **How competitive is the suntheanine niche?**
- 8 brands and 43 sellers compete. The top 5 products take 79% of clicks and top 5 brands hold 93% of demand.
- **What do buyers complain about in suntheanine?**
- Top complaints mined from reviews: Functionality-Overall, Value For Money, Stress/Anxiety. The return rate is 0.0%.
- **When does demand for suntheanine peak?**
- Demand peaks in Feb–Mar–Apr; the busiest month runs 3.9× the quietest.
- **What does it cost to enter the suntheanine niche?**
- Listings span $11.91–$66.04; the average listing price is $28.36 (sweet spot $15–$100). The average incumbent carries 4,617 reviews — the moat a new listing must climb.
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