l theanine 200mg
Skip itA small market ($60K/yr) — this niche doesn't clear our bar today.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Incredible15.5%search→purchase rate — share of searches ending in a sale
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Review moat
Good1,154.77avg incumbent reviews — the moat a new listing must climb
Brand share
Good73%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£10.22avg listing price — sweet spot $15–$100
Price range
Bad£5.53–£17.81cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Bad73%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
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.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.
All 13 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Nutricost L-Theanine 200mg 120 Capsules - Non-GMO Gluten Free
Nutricost£6.664.4★9,555 rev
L-Theanine 200mg from Green Tea - 90 Vegan Capsules - Amino Acid Supplement Resealable and Recyclable Pouch by Alpha01
ALPHA01£5.664.3★742 rev
Natures Best L Theanine 200mg 60 Capsules (2 Month Supply)
NATURE'S BEST£10.714.7★49 rev
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£9.484.6★171 rev
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£8.354.0★126 rev
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£5.5346 rev
L Theanine Gummies - 200 mg L-Theanine Supplement with Lemon Balm & Vitamin B6 - Supports Nervous System & Hormonal Function - Vegan Halal - 60 Count - Novomins
novomins£11.4735 rev
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£11.4996 rev
Natures Best L Theanine 200mg 60 Capsules (2 Month Supply)
NATURE'S BEST£10.7149 rev
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£9.48171 rev
Trending
90-day click momentumL Theanine Gummies - 200 mg L-Theanine Supplement with Lemon Balm & Vitamin B6 - Supports Nervous System & Hormonal Function - Vegan Halal - 60 Count - Novomins
novomins£11.474.4★
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£11.494.5★
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£5.534.0★
Natures Best L Theanine 200mg 60 Capsules (2 Month Supply)
NATURE'S BEST£10.714.7★
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£9.484.6★
What buyers say about l theanine 200mg
What buyers praise and complain about, mined from review topics.What buyers love
“Great sleep quality”
“Great for anxiety”
“reasonable price”
“less brain fog”
“I found the chewy”
“Overall, a solid product that does exactly what I hoped it would”
“Great supplement”
“Taste is pleasant”
“ease of use”
“Effective”
What buyers complain about
“was not sleeping very well”
“However this bag really smells”
“Didn't work for me”
“Not 200mg”
“I suffer from bad anxiety and dpdr”
“Gave me headaches”
“Not the best”
“have no taste”
“Pills and content changed”
“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.