L Theanine 400mg
Skip itA concentrated shelf (top 5 take 100% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Avg price
Great$52.80avg listing price — sweet spot $15–$100
Price range
Great$18.65–$109.15cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great9.4%search→purchase rate — share of searches ending in a sale
Review moat
Good1,397.2avg incumbent reviews — the moat a new listing must climb
Growth
Okay+9.3%90-day search growth — must beat 0% to launch
Market size
Okay$133K$133K/yr · 27K searches
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
Competition
Bad100%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand
Is l theanine 400mg profitable on Amazon?
According to Flapen's Amazon United States niche tracking, l theanine 400mg is a $133K/yr Amazon United States market (27K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jul–Aug. Verdict: Skip it — 42/100.
Data updated Jul 25, 2026 · scored weekly · How we score niches
l theanine 400mg market size & sales
Units sold, revenue, conversion and listing quality across the tracked shelf.- Units sold / yr
- 3K–3K
- avg 500–750/product
- Revenue / yr
- $132K–$158K
- units × avg price
- Conversion rate
- 9.4%
- Avg BSR
- #40
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 100%
- Out of stock
- 0.0%
- Avg brand age
- 97 months
- Avg seller age
- 164 days
Competition: brands, sellers & click share
The top 5 products capture 100% of clicks — a locked-up shelf that new listings rarely crack.Brands
3 falling
Sellers
4
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
100%
Top 20: 100%
Open market
0%
- Pure Encapsulations92%
- NUTRAHARMONY5%
- Integrative Therapeutics4%
- Open — no brand owns it (0%)
l theanine 400mg demand & seasonality
Weekly Amazon search volume, last 104 weeks — +9.3% search growth over the last 90 days.Peak months: Jul, Aug · busiest ÷ quietest = 4.0×
Top l theanine 400mg search terms shoppers use
The exact queries shoppers type, with yearly volume, growth and conversion.- pure encapsulations l-theanine12K/yr
- pure l theanine9K/yr
- l theanine pure encapsulations5K/yr
Top l theanine 400mg products & what they sell for
Every tracked product — its share of the shelf, its review moat, and what it sells for.Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 5 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Pure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation Stress & Nervous System* - 60 Capsules
Pure Encapsulations$62.424.7★915 rev
Pure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation Stress & Nervous System* - 120 Capsules
Pure Encapsulations$109.154.7★915 rev
Pure Encapsulations Cortisol Calm - Supports Cortisol Health & Relaxation* - Contains Ashwagandha & L-Theanine - Restful Sleep - 60 Capsules
Pure Encapsulations$52.734.5★1,383 rev
L Theanine 400 mg | L-Theanine Stress Relief | Extra Strength Supplement | Lab Tested | Relaxation Sleep & Calm Support | For Men & Women | Plant Based Non-GMO & Gluten-Free | 120 Vegan Capsules
NUTRAHARMONY$18.654.6★2,155 rev
Integrative Therapeutics L-Theanine - Amino Acid Supplement for Stress & Relaxation Support* - Vegan Gluten-Free & Dairy-Free - Third-Party Tested - 60 Capsules (30 Servings)
Integrative Therapeutics$21.064.6★1,618 rev
Newest
by launch dateL Theanine 400 mg | L-Theanine Stress Relief | Extra Strength Supplement | Lab Tested | Relaxation Sleep & Calm Support | For Men & Women | Plant Based Non-GMO & Gluten-Free | 120 Vegan Capsules
NUTRAHARMONY$18.652,155 rev
Pure Encapsulations Cortisol Calm - Supports Cortisol Health & Relaxation* - Contains Ashwagandha & L-Theanine - Restful Sleep - 60 Capsules
Pure Encapsulations$52.731,383 rev
Pure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation Stress & Nervous System* - 60 Capsules
Pure Encapsulations$62.42915 rev
Pure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation Stress & Nervous System* - 120 Capsules
Pure Encapsulations$109.15915 rev
Integrative Therapeutics L-Theanine - Amino Acid Supplement for Stress & Relaxation Support* - Vegan Gluten-Free & Dairy-Free - Third-Party Tested - 60 Capsules (30 Servings)
Integrative Therapeutics$21.061,618 rev
Trending
90-day click momentumPure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation Stress & Nervous System* - 60 Capsules
Pure Encapsulations$62.424.7★
Pure Encapsulations Cortisol Calm - Supports Cortisol Health & Relaxation* - Contains Ashwagandha & L-Theanine - Restful Sleep - 60 Capsules
Pure Encapsulations$52.734.5★
Integrative Therapeutics L-Theanine - Amino Acid Supplement for Stress & Relaxation Support* - Vegan Gluten-Free & Dairy-Free - Third-Party Tested - 60 Capsules (30 Servings)
Integrative Therapeutics$21.064.6★
L Theanine 400 mg | L-Theanine Stress Relief | Extra Strength Supplement | Lab Tested | Relaxation Sleep & Calm Support | For Men & Women | Plant Based Non-GMO & Gluten-Free | 120 Vegan Capsules
NUTRAHARMONY$18.654.6★
Pure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation Stress & Nervous System* - 120 Capsules
Pure Encapsulations$109.154.7★
What reviews say buyers love and hate about l theanine 400mg
What buyers praise and complain about, mined from review topics.What buyers love
“Great for sleep”
“Excellent product”
“It really helps with anxiety”
“Calming and relaxing”
“As advertised”
“Works well”
“Focus is up”
“Great With Prescription”
“Helped hot flashes in 3 days”
“Quality supplements”
What buyers complain about
“I still dont sleep”
“Cortisol calm did not work for me”
“I will say that taking 2+ pills doesnt enhance effects for me, at all”
“Not worth the price”
“I will say that taking 2+ pills doesnt enhance effects for me, at all”
“Severe g. i. issues”
“Allergic reaction”
“I never expect much from supplements because nothing ever did much to help”
“no taste”
“taking this supplement as well made me shaky, weak, and sleepy”
Top return reasons
Common l theanine 400mg questions
- Is l theanine 400mg profitable to sell on Amazon United States?
- The niche generates $133K/yr across 5 tracked products. 90-day search growth is +9.3%. Flapen's verdict: Skip it (42/100).
- How competitive is the l theanine 400mg niche?
- 3 brands and 4 sellers compete. The top 5 products take 100% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in l theanine 400mg?
- Top complaints mined from reviews: Sleep Quality, Functionality-Overall, Dosage. The return rate is 0.0%.
- When does demand for l theanine 400mg peak?
- Demand peaks in Jul–Aug; the busiest month runs 4.0× the quietest.
- What does it cost to enter the l theanine 400mg niche?
- Listings span $18.65–$109.15; the average listing price is $52.80 (sweet spot $15–$100). The average incumbent carries 1,397 reviews — the moat a new listing must climb.