L Theanine
MaybeAn estimated 0.0% of orders come back. But prices span $4.98–$17.18, mostly outside the sweet spot, so L Theanine is a Maybe.
- Flapen Score
- 53 / 100Top 29% of 2,035 Health & Personal Care niches · +5 vs the category median of 4853
- Market size
- £742K/yr580K searches / yr
- 90-day growth
- +1.8%search demand this quarter
- Competition
- 73%top-5 click share · 14 brands · 18 sellers
Flapen Score
L Theanine against its category
The dotted line is the Health & Personal Care average. Past it, L Theanine is stronger. Inside it, weaker.
Market
The L Theanine market on Amazon at a glance
Shoppers on Amazon United Kingdom searched for L Theanine 580K times last year and spent an estimated £742K. The top 5 brands take 73% of clicks. Demand peaks in Apr–May. Flapen scores it 53 out of 100, a Maybe.
01 · Demand
An estimated 14.8% of those searches ended in a purchase.
Shoppers searched for this 580K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. An estimated 14.8% of those searches ended in a purchase. Searches in the last 90 days moved +1.8% against the 90 days before. Searches, conversion and average price together put the market at an estimated £742K a year.
- Searches, last 12 months
- 580K
- Growth, 90 days vs prior 90
- +1.8%
- Conversion, latest week
- 14.8%
- Market size, estimated
- £742Ka year
- Peak month
- April2.0× the quietest month
- Top search term
- l theanine265K searches a year
02 · Price
A sale here is worth £8.63.
Listings sell for £8.63 on average, from £4.98 to £17.18. Amazon reports units sold in ranges. This niche sold 60K to 80K a year. The average listing sells 5,000 to 6,000 of them. At £8.63 that is £43K to £52K a year per listing.
- Average price
- £8.63under the $15 to $100 sweet spot
- Price range
- £4.98–£17.18
- Amazon United Kingdom median price
- £12.12across 27,606 niches
- Units sold a year
- 60K–80K
- Units per listing a year
- 5,000–6,000
- Revenue per listing a year
- £43K–£52K
- Returns
- 0.0%of orders · Amazon United Kingdom median 0.6%
03 · Entry bar
The bar here is ads and reviews.
93% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 10.3% of listings are out of stock. The average listing ranks #120 within Over-the-Counter Medication. It carries 1,516 reviews at 4.41 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 93%
- Prime listings
- 100%
- Out of stock, average day
- 10.3%
- Average rank
- #120in Over-the-Counter Medication
- Average rating
- 4.41 starsAmazon United Kingdom average 4.36 stars
- Average reviews
- 1,516per listing
- Listings tracked
- 15
04 · Newcomers
2 of last year's 4 launches cleared the first-year sales bar.
4 products launched here in the last 12 months. 2 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 36 months on average, so the names here are settling in.
- Launched, last 12 months
- 4
- Successful launches
- 2Amazon's first-year sales bar
- Average brand age
- 36 months
Products
Top L Theanine products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 25, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
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
- Price
- £9.48
- Rating
- 4.6/5
- Reviews
- 171
- Age
- 1y ago

L Theanine Enriched with Vitamin B6 - High Strength L-Theanine Capsules 400mg Natural Nootropics from Green Tea - 120 Vegan Capsules - Made in The UK Supplements by New Leaf
- Price
- £7.99
- Rating
- 4.5/5
- Reviews
- 729
- Age
- 2y ago

L Theanine 400mg | 120 Vegan Capsules - 4 Months Supply | Good Alternative to L-Theanine Powder Gummies and Drops | UK Made LTheanine Supplement
- Price
- £7.73
- Rating
- 4.6/5
- Reviews
- 473
- Age
- 2y ago

Nutricost L-Theanine 200mg 120 Capsules - Non-GMO Gluten Free
- Price
- £6.66
- Rating
- 4.4/5
- Reviews
- 9,555
- Age
- 10y ago

L-Theanine Green Tea Extract with Added Lemon Balm Extract and Chelated Magnesium Glycinate - Derived from Green Tea Leaves - Sleep & Relaxation Support - Mental Clarity
- Price
- £5.53
- Rating
- 4.0/5
- Reviews
- 46
- Age
- 6mo ago
Trending
estimated 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
- Price
- £11.47
- Rating
- 4.4/5
- Reviews
- 35
- Age
- 6mo ago

L-Theanine Green Tea Extract with Added Lemon Balm Extract and Chelated Magnesium Glycinate - Derived from Green Tea Leaves - Sleep & Relaxation Support - Mental Clarity
- Price
- £5.53
- Rating
- 4.0/5
- Reviews
- 46
- Age
- 6mo ago

Natures Best L Theanine 200mg 60 Capsules (2 Month Supply)
- Price
- £10.71
- Rating
- 4.7/5
- Reviews
- 49
- Age
- 9mo ago

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
- Price
- £9.48
- Rating
- 4.6/5
- Reviews
- 171
- Age
- 1y ago

Ashwagandha KSM 66 Complex 3000mg Enhanced with L-Tryptophan & Vitamin B6 (2 Month Supply) Ashwagandha High Strength Capsules with 250mg Extract (Not Gummies or Powder) - Vegan UK Made
- Price
- £7.26
- Rating
- 4.4/5
- Reviews
- 6,943
- Age
- 3y ago
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
- Price
- £5.53
- Rating
- 4.0/5
- Reviews
- 46
- Age
- 6mo ago

L Theanine Gummies - 200 mg L-Theanine Supplement with Lemon Balm & Vitamin B6 - Supports Nervous System & Hormonal Function - Vegan Halal - 60 Count - Novomins
- Price
- £11.47
- Rating
- 4.4/5
- Reviews
- 35
- Age
- 6mo ago

Natures Best L Theanine 200mg 60 Capsules (2 Month Supply)
- Price
- £10.71
- Rating
- 4.7/5
- Reviews
- 49
- Age
- 9mo ago

L-Theanine 400mg with BioPerine | 120 Vegan Capsules | High Absorption & Bioavailablity L Theanine | Enhanced Sleep at Night | Boost Focus & Relieve Stress | 4 Months Supply | UK Made | by NutriVolv
- Price
- £5.73
- Rating
- 4.4/5
- Reviews
- 59
- Age
- 10mo ago

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
- Price
- £9.48
- Rating
- 4.6/5
- Reviews
- 171
- Age
- 1y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 73% of clicks. A locked shelf that new listings rarely crack.
Brands
14 falling
Sellers
18
Est. top-5 brand share
73%
Top 20: 100%
Est. top-5 click share
73%
Top 20: 100%
Open market
18%
- NUTRINATION22%
- NEW LEAF PRODUCTS21%
- Nutrivo12%
- Nutricost10%
- SS Sport Supplies9%
- WeightWorld8%
Demand
L Theanine search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Apr, May · busiest ÷ quietest = 2.0×
Search terms
Top L Theanine search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- l theanine265K/yr
- l-theanine169K/yr
- l theanine 400mg22K/yr
- ltheanine25K/yr
- theanine26K/yr
- l-theanine 400mg10K/yr
- suntheanine7K/yr
- l theanine supplement34K/yr
- l theanine 100mg5K/yr
- l- theanine5K/yr
Reviews and returns
What reviews say buyers love and hate about L Theanine
We read the reviews and the return reasons for every product selling here.
“Not enough to be clinically effective at all”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
16 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common L Theanine questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









