Is l theanin profitable to sell on Amazon Germany?

The niche generates €1.1M/yr across 16 tracked products. 3 of 5 products launched in the last 360 days are still selling. 90-day search growth is -15.7%. Flapen's verdict: Worth a look (58/100).

How competitive is the l theanin niche?

13 brands and 26 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 72% of demand.

What do buyers complain about in l theanin?

Top complaints mined from reviews: Funktionalität insgesamt, Schlafqualität, Magnesium. The return rate is 0.1%.

When does demand for l theanin peak?

Demand peaks in Jul; the busiest month runs 2.9× the quietest.

What does it cost to enter the l theanin niche?

Listings span €9.29–€21.88; the average listing price is €15.96 (sweet spot $15–$100). The average incumbent carries 922 reviews — the moat a new listing must climb.

l theanin

Worth a look

Shows low returns (0.1%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Returns

Incredible0.1%

return rate — above 5% kills the launch gate

Conversion

Great11.3%

search→purchase rate — share of searches ending in a sale

Market size

Great€1.1M

€1.1M/yr · 637K searches

Avg price

Great€15.96

avg listing price — sweet spot $15–$100

Review moat

Good921.69

avg incumbent reviews — the moat a new listing must climb

Brand share

Good72%

top-5 brand share — brands hold most of the demand

Price range

Good€9.29–€21.88

cheapest to priciest tracked listing — scored on the share inside $15–$100

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Competition

Bad70%

top-5 click share — a locked-up shelf

Growth

Bad-15.7%

90-day search growth — must beat 0% to launch

According to Flapen's Amazon Germany niche tracking, l theanin is a €1.1M/yr Amazon Germany market (637K searches/yr). The top 5 brands hold 72% of demand. Demand peaks in Jul. Verdict: Worth a look — 58/100.

Data updated Jul 11, 2026 · scored weekly · How we score niches

l theanin market data

Units sold / yr: 60K–80K; avg 2,500–3,000/product
Revenue / yr: €958K–€1.3M; units × avg price
Conversion rate: 11.3%
Avg BSR: #468
Page quality: 0%
Prime: 88%
Sponsored: 69%
Out of stock: 4.6%
Avg brand age: 44 months
Avg seller age: 178 days

Competition & brand share

The top 5 products capture 70% of clicks — a locked-up shelf that new listings rarely crack.

Brands

13 falling

Sellers

Top-5 brand share

72%

Top 20: 100%

Top-5 click share

70%

Top 20: 100%

Open market

22%

WeightWorld27%
Naturkur13%
supplenatura. Rheinland12%
Nutricost11%
EXVital10%
Vit4ever6%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -15.7% search growth over the last 90 days.

Peak months: Jul · busiest ÷ quietest = 2.9×

Open Trend

Top l theanin search terms

l theanin283K/yr -12.1%10.0% conv.
l-theanin148K/yr -19.2%10.6% conv.
l theanine26K/yr +20.4%9.0% conv.
l-theanine29K/yr +9.7%8.0% conv.
theanin32K/yr -15.5%9.6% conv.
l theanin 200mg34K/yr -50.7%11.1% conv.
suntheanine7K/yr +0.2%3.6% conv.
l-theanin 200mg16K/yr -40.2%13.3% conv.
l theanin 500mg11K/yr -59.1%12.7% conv.
l theanin 100mg7K/yr -49.5%6.9% conv.

All search terms

Top l theanin 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 16 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

L Theanin - 401 mg pro Kapsel - 6 Monate Vorrat - Mit Schwarzer Pfeffer Extrakt (98% Piperin) & Vitamin B6 - L-Theanine aus Camellia Sinensis - 180 Kapseln - Frei von Magnesiumstearat - WeightWorld

WeightWorld€17.434.5★2,596 rev

L Theanin | IDEAL DOSIERT: 200mg | 240 Kapseln | Laborgeprüft & Hochrein | L-Theanin von SUPPLENATURA

supplenatura. Rheinland€20.524.7★237 rev

Naturkur L-Theanin 200mg - 360 Kapseln im Apothekerglas - Vegan ohne Zusatzstoffe in Handarbeit hergestellt in Unterfranken

Naturkur€19.944.7★131 rev

Nutricost L-Theanin 200mg 120 Kapseln Doppelte Stärke - Nicht-GMO Glutenfrei

Nutricost€12.264.5★9,449 rev

EXVital L-Theanin 180 vegane Kapseln 400 mg L-Theanin pro Kapsel aus Grüntee Blattextrakt L-Theanine Aminosäure vegan & ohne Zusätze laborgeprüft

EXVital€17.684.5★363 rev

Newest

by launch date

L-Theanin 500 mg 180 Vegane Kapseln Hochdosierte Aminosäure aus Grüntee | 6-Monatsvorrat | 98% Rein Keine Zusatzstoffe | Hergestellt in Dänemark

SOURCE OF NATURE€14.1766 rev

7mo ago

L-Theanin 200mg 240 Vegane Kapseln Hochdosierte Aminosäure aus Grüntee | 8-Monatsvorrat | 98% Rein Ohne Zusatzstoffe | Hergestellt in Dänemark

SOURCE OF NATURE€12.6083 rev

8mo ago

MoleQlar L-Theanin Kapseln 200 mg - 60 Kapseln Pure Green Tea Extract - Natürliche Aminosäure aus grünem Tee geprüft & hochrein - Camellia sinensis Extrakt

MoleQlar€18.3448 rev

8mo ago

L Theanin | IDEAL DOSIERT: 200mg | 240 Kapseln | Laborgeprüft & Hochrein | L-Theanin von SUPPLENATURA

supplenatura. Rheinland€20.52237 rev

9mo ago

Naturkur L-Theanin 200mg - 360 Kapseln im Apothekerglas - Vegan ohne Zusatzstoffe in Handarbeit hergestellt in Unterfranken

Naturkur€19.94131 rev

10mo ago

What buyers say about l theanin

What buyers praise and complain about, mined from review topics.

What buyers love

Qualität insgesamt17%

“Super Produkt”

Fokusverbesserung10%

“Sehr hochwertiges L-Theanin Supplement für Fokus, Entspannung und mentale Balance”

Schlafqualität10%

“Zum Produkt selbst kann ich nur Positives sagen: Es hilft mir in den Wechseljahren sehr gut beim Einschlafen – und das tatsächlich schon ab der ersten Einnahme”

Dosierung7%

“Dosierung und Wiekung”

Spannung/Angst6%

“hat meinen Stress gesenkt”

beworben Vs Tatsächliches Produkt5%

“Beschreibung des Produkts entspricht dem Produkt”

Einfaches Kauen/Schlucken4%

“sich mit einem Schluck Wasser problemlos schlucken.”

Effizienz4%

“Wirksames L-Theanin”

Inhaltsstoffe – insgesamt3%

“Sehr hochwertiges L-Theanin Supplement für Fokus, Entspannung und mentale Balance”

Nebenwirkungen3%

“Gut verträglich, kein Druckgefühl oder Nebenwirkungen”

What buyers complain about

Funktionalität insgesamt19%

“Wirkt nicht”

Schlafqualität7%

“ich in der Perimenopause bin totale Schwierigkeiten mit dem ein und durchschlafen.”

Magnesium6%

“Alles ok, bis auf Magnesiumstearat”

Dosierung5%

“Zu hoch dosiert”

Nebenwirkungen3%

“Der Effekt ist eher dezent”

Auslaufsicher3%

“ausgelaufen im Behälter”

Vitamin3%

“Allerdings finde ich es schade, dass Vitamin B6 mit drin ist, da ich ein Vitamin B Präparat nehme”

Qualität insgesamt2%

“bin von der mangelhaften Verarbeitung absolut schockiert.”

Spannung/Angst2%

“und habe kaum noch Angst - oder Stresssymptome.”

Reguliert die Verdauung1%

“Silziumdioxid (Macht den Darm kaputt”

Top return reasons

Qualität insgesamt25%

Vegan/Biologisch25%

Säureregulator/Linderung von Magenschmerzen25%

beworben Vs Tatsächliches Produkt25%

Common questions

Is l theanin profitable to sell on Amazon Germany?: The niche generates €1.1M/yr across 16 tracked products. 3 of 5 products launched in the last 360 days are still selling. 90-day search growth is -15.7%. Flapen's verdict: Worth a look (58/100).
How competitive is the l theanin niche?: 13 brands and 26 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 72% of demand.
What do buyers complain about in l theanin?: Top complaints mined from reviews: Funktionalität insgesamt, Schlafqualität, Magnesium. The return rate is 0.1%.
When does demand for l theanin peak?: Demand peaks in Jul; the busiest month runs 2.9× the quietest.
What does it cost to enter the l theanin niche?: Listings span €9.29–€21.88; the average listing price is €15.96 (sweet spot $15–$100). The average incumbent carries 922 reviews — the moat a new listing must climb.