---
title: "L Theanine 200mg — £60K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/health-personal-care/l-theanine-200mg"
last_updated: "2026-07-31T14:27:30.049Z"
locale: en
meta:
description: "Niche score 48/100 · £60K/yr market · 38K searches/yr · £10.22 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · £60K/yr market · 38K searches/yr · £10.22 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "L Theanine 200mg — £60K/yr Amazon UK Niche (2026) - Flapen"
---
# **l theanine 200mg**
**Skip it**
A small market ($60K/yr) — this niche doesn't clear our bar today.
Market size 15Growth 36Conversion 97Competition 22Returns 100Price range 23Avg price 35Brand share 53Review moat 59Quality gap 62
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****15.5%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Good****1,154.77**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Good****73%**
top-5 brand share — brands hold most of the demand
**Growth**
**Okay****+9.2%**
90-day search growth — must beat 0% to launch
**Avg price**
**Okay****£10.22**
avg listing price — sweet spot $15–$100
**Price range**
**Bad****£5.53–£17.81**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Bad****73%**
top-5 click share — a locked-up shelf
**Market size**
**Bad****£60K**
£60K/yr · 38K searches
According to Flapen's Amazon United Kingdom niche tracking, l theanine 200mg is a £60K/yr Amazon United Kingdom market (38K searches/yr). The top 5 brands hold 73% of demand. Verdict: Skip it — 48/100.
Data updated Jul 25, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **l theanine 200mg market data**
- **Units sold / yr**
- **5K–6K**
- avg 500–750/product
- **Revenue / yr**
- **£51K–£61K**
- units × avg price
- **Conversion rate**
- **15.5%**
- **Avg BSR**
- **#158**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **92%**
- **Out of stock**
- **12.6%**
- **Avg brand age**
- **34 months**
- **Avg seller age**
- **173 days**
## **Competition & brand share**
The top 5 products capture 73% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**13 **▲rising
**Sellers**
**17**
**Top-5 brand share**
**73%**
Top 20: 100%
**Top-5 click share**
**73%**
Top 20: 100%
**Open market**
**22%**
- Nutricost41% - ALPHA0113% - NATURE'S BEST9% - NUTRINATION5% - Health Thru Nutrition5% - NEW LEAF PRODUCTS5%
## **Demand**
Weekly Amazon search volume, last 25 weeks — +9.2% search growth over the last 90 days.
2K1KSpike '26Feb '26Mar '26Mar '26Apr '26May '26Jun '26
[**Open Trend **](https://flapen.com/research/uk/health-personal-care/l-theanine-200mg/trend)
## **Top l theanine 200mg 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%15%£9K30%£18K45%£27K60%£36K101001K10K 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**Nutricost L-Theanine 200mg 120 Capsules - Non-GMO Gluten Free**Nutricost**£6.66**4.4★9,555 rev](https://www.amazon.co.uk/dp/B01B3RWQNM) [2**L-Theanine 200mg from Green Tea - 90 Vegan Capsules - Amino Acid Supplement Resealable and Recyclable Pouch by Alpha01**ALPHA01**£5.66**4.3★742 rev](https://www.amazon.co.uk/dp/B09883BLBT) [3**Natures Best L Theanine 200mg 60 Capsules (2 Month Supply)**NATURE'S BEST**£10.71**4.7★49 rev](https://www.amazon.co.uk/dp/B0FVGC5GX4) [4**L Theanine 400mg Capsules - 99.6% Pure L-Theanine | 5 Months Supply - 150 Capsules | Supports Relaxation & Focus Promotes Calm | Zero Additives Vegan & Non-GMO | GMP - Certified Lab Tested**NUTRINATION**£9.48**4.6★171 rev](https://www.amazon.co.uk/dp/B0DJM84N9K) [5**L-Theanine 200mg Vegan as PhytoSure Certified | Supports Healthy Relaxation & Focus | 3rd Party Tested | Clean Label Non-GMO Gluten & Soy Free Hypoallergenic | by Health Thru Nutrition (Pack of 60)**Health Thru Nutrition**£8.35**4.0★126 rev](https://www.amazon.co.uk/dp/B074VDBH38)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**L-Theanine Green Tea Extract with Added Lemon Balm Extract and Chelated Magnesium Glycinate - Derived from Green Tea Leaves - Sleep & Relaxation Support - Mental Clarity**SS Sport Supplies**£5.53**46 rev6mo ago](https://www.amazon.co.uk/dp/B0GJV27PV3) [**L Theanine Gummies - 200 mg L-Theanine Supplement with Lemon Balm & Vitamin B6 - Supports Nervous System & Hormonal Function - Vegan Halal - 60 Count - Novomins**novomins**£11.47**35 rev6mo ago](https://www.amazon.co.uk/dp/B0FZW7882R) [**L-Theanine 200mg 240 Vegan Capsules High Strength Amino Acid from Green Tea | 8-Month Supply | 98% Pure No Additives | Danish Made**Source of Nature**£11.49**96 rev8mo ago](https://www.amazon.co.uk/dp/B0G1M87Y4T) [**Natures Best L Theanine 200mg 60 Capsules (2 Month Supply)**NATURE'S BEST**£10.71**49 rev9mo ago](https://www.amazon.co.uk/dp/B0FVGC5GX4) [**L Theanine 400mg Capsules - 99.6% Pure L-Theanine | 5 Months Supply - 150 Capsules | Supports Relaxation & Focus Promotes Calm | Zero Additives Vegan & Non-GMO | GMP - Certified Lab Tested**NUTRINATION**£9.48**171 rev1y ago](https://www.amazon.co.uk/dp/B0DJM84N9K)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**L Theanine Gummies - 200 mg L-Theanine Supplement with Lemon Balm & Vitamin B6 - Supports Nervous System & Hormonal Function - Vegan Halal - 60 Count - Novomins**novomins**£11.47**4.4★**▲ 197%**](https://www.amazon.co.uk/dp/B0FZW7882R) [**L-Theanine 200mg 240 Vegan Capsules High Strength Amino Acid from Green Tea | 8-Month Supply | 98% Pure No Additives | Danish Made**Source of Nature**£11.49**4.5★**▲ 175%**](https://www.amazon.co.uk/dp/B0G1M87Y4T) [**L-Theanine Green Tea Extract with Added Lemon Balm Extract and Chelated Magnesium Glycinate - Derived from Green Tea Leaves - Sleep & Relaxation Support - Mental Clarity**SS Sport Supplies**£5.53**4.0★**▲ 123%**](https://www.amazon.co.uk/dp/B0GJV27PV3) [**Natures Best L Theanine 200mg 60 Capsules (2 Month Supply)**NATURE'S BEST**£10.71**4.7★**▲ 76%**](https://www.amazon.co.uk/dp/B0FVGC5GX4) [**L Theanine 400mg Capsules - 99.6% Pure L-Theanine | 5 Months Supply - 150 Capsules | Supports Relaxation & Focus Promotes Calm | Zero Additives Vegan & Non-GMO | GMP - Certified Lab Tested**NUTRINATION**£9.48**4.6★**▲ 75%**](https://www.amazon.co.uk/dp/B0DJM84N9K)
**~~View all trending →~~**
## **What buyers say about l theanine 200mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**18%
*“Great sleep quality”*
**Stress/Anxiety**9%
*“Great for anxiety”*
**Value For Money**7%
*“reasonable price”*
**Focus Enhancement**6%
*“less brain fog”*
**Ease Of Chewing/Swallowing**5%
*“I found the chewy”*
**Quality-Overall**5%
*“Overall, a solid product that does exactly what I hoped it would”*
**Vitamin**4%
*“Great supplement”*
**Taste-Overall**4%
*“Taste is pleasant”*
**Ease Of Use**4%
*“ease of use”*
**Efficiency**3%
*“Effective”*
### **What buyers complain about **
**Sleep Quality**8%
*“was not sleeping very well”*
**Smell**7%
*“However this bag really smells”*
**Functionality-Overall**5%
*“Didn't work for me”*
**Dosage**5%
*“Not 200mg”*
**Stress/Anxiety**3%
*“I suffer from bad anxiety and dpdr”*
**Side Effects**3%
*“Gave me headaches”*
**Quality-Overall**3%
*“Not the best”*
**Taste-Overall**3%
*“have no taste”*
**Ingredients-Overall**2%
*“Pills and content changed”*
**Vegan/Organic**2%
*“It's no longer organic, and now contains less of the source ingredient and more fillers”*
## **Common questions**
- **Is l theanine 200mg profitable to sell on Amazon United Kingdom?**
- The niche generates £60K/yr across 13 tracked products. 2 of 4 products launched in the last 360 days are still selling. 90-day search growth is +9.2%. Flapen's verdict: Skip it (48/100).
- **How competitive is the l theanine 200mg niche?**
- 13 brands and 17 sellers compete. The top 5 products take 73% of clicks and top 5 brands hold 73% of demand.
- **What do buyers complain about in l theanine 200mg?**
- Top complaints mined from reviews: Sleep Quality, Smell, Functionality-Overall. The return rate is 0.0%.
- **What does it cost to enter the l theanine 200mg niche?**
- Listings span £5.53–£17.81; the average listing price is £10.22 (sweet spot $15–$100). The average incumbent carries 1,155 reviews — the moat a new listing must climb.
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