Is l theanine profitable to sell on Amazon United States?

The niche generates $17.6M/yr across 22 tracked products. 90-day search growth is +3.8%. Flapen's verdict: Launch it (66/100).

How competitive is the l theanine niche?

17 brands and 571 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 64% of demand.

What do buyers complain about in l theanine?

Top complaints mined from reviews: Sleep Quality, Functionality-Overall, Dosage. The return rate is 0.0%.

When does demand for l theanine peak?

Demand is steady year-round — the busiest month runs 1.4× the quietest.

What does it cost to enter the l theanine niche?

Listings span $9.86–$66.04; the average listing price is $23.66 (sweet spot $15–$100). The average incumbent carries 5,311 reviews — the moat a new listing must climb.

L Theanine

Launch it

A $17.6M/yr market growing +3.8% this quarter with returns at 0.0% — clears our launch bar.

Market size

Incredible$17.6M

$17.6M/yr · 5.2M searches

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Incredible14.4%

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

Avg price

Incredible$23.66

avg listing price — sweet spot $15–$100

Price range

Great$9.86–$66.04

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

Brand share

Good64%

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

Competition

Okay56%

top-5 click share — leaders hold, buyers still browse

Growth

Okay+3.8%

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

Review moat

Bad5,311.14

avg incumbent reviews — the moat a new listing must climb

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Is l theanine profitable on Amazon?

According to Flapen's Amazon United States niche tracking, l theanine is a $17.6M/yr Amazon United States market (5.2M searches/yr). The top 5 brands hold 64% of demand. Verdict: Launch it — 66/100.

Data updated Jul 25, 2026 · scored weekly · How we score niches

l theanine market size & sales

Units sold, revenue, conversion and listing quality across the tracked shelf.

Units sold / yr: 600K–800K; avg 25,000–30,000/product
Revenue / yr: $14.2M–$18.9M; units × avg price
Conversion rate: 14.4%
Avg BSR: #134
Page quality: 0%
Prime: 100%
Sponsored: 86%
Out of stock: 0.0%
Avg brand age: 44 months
Avg seller age: 144 days

Competition: brands, sellers & click share

The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.

Brands

17 flat

Sellers

571

Top-5 brand share

64%

Top 20: 100%

Top-5 click share

56%

Top 20: 98%

Open market

30%

Nutricost26%
Nature's Trove14%
Sports Research9%
NOW Foods8%
Pure Encapsulations6%
Integrative Therapeutics6%

l theanine demand & seasonality

Weekly Amazon search volume, last 104 weeks — +3.8% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top l theanine search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

l theanine2.1M/yr +8.7%13.0% conv.
l-theanine1.1M/yr -0.1%12.0% conv.
l theanine supplement689K/yr -10.8%10.8% conv.
ltheanine272K/yr +9.7%11.4% conv.
l-theanine 200mg183K/yr +4.9%16.4% conv.
theanine195K/yr -2.0%13.8% conv.
l theanine 200mg122K/yr +14.9%13.9% conv.
l-theanine 400mg75K/yr +63.9%9.3% conv.
l theanine 400mg46K/yr +94.8%9.3% conv.
theanine supplement56K/yr -4.1%10.3% conv.

All search terms

Top l theanine 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.

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

All 22 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Nutricost L-Theanine 200mg 120 Capsules Double Strength Gluten Free

Nutricost$11.914.6★9,940 rev

Natures Trove L-Theanine 200mg 120 Vegetarian Capsules

Nature's Trove$9.864.6★27,416 rev

Sports Research Double Strength L-Theanine Supplement - Suntheanine Softgels for Focus Relaxation & Alertness - Non-Drowsy Support Made with Coconut Oil Non-GMO & Gluten Free - 200mg 60 Count

Sports Research$19.054.5★15,233 rev

Pure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation Stress & Nervous System* - 60 Capsules

Pure Encapsulations$62.424.7★915 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 date

Micro Ingredients L-Theanine 400mg 400 Softgels | Highly Bioavailable with Coconut Oil | Extra Strength Theanine Amino Acid | Calm & Relaxation Support + Focus Supplement | Non-GMO Gluten Free

Micro Ingredients$24.58261 rev

1y ago

Extra Strength L-Theanine Supplement 400mg 400 Capsules (200mg Per Cap)

DEAL SUPPLEMENT$16.13436 rev

1y ago

L-Theanine 200mg with Magnesium Glycinate 400 Coconut MCT Oil Softgels | 2-in-1 Amino Acid & Mineral Complex | Gentle Care All Day & Night

Micro Ingredients$24.05795 rev

1y ago

NUTRAHARMONY$18.652,155 rev

3y ago

BulkSupplements.com L-Theanine Capsules - L-Theanine Supplement L-Theanine 200mg Theanine Pills - Amino Amino Supplement Gluten Free - 1 Theanine Capsule per Serving 365 Capsules

BulkSupplements$17.17941 rev

3y ago

What reviews say buyers love and hate about l theanine

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

What buyers love

Sleep Quality20%

“Helps with sleep”

Quality-Overall14%

“overall a solid and reliable product”

Stress/Anxiety10%

“Anxiety Relief”

Focus Enhancement8%

“Helps focus”

Value For Money5%

“Great Value”

Soothing Effect5%

“Helps calm”

Efficiency5%

“Effective”

Advertised Vs Actual Product4%

“Works as directed”

Vitamin3%

“these vitamins help me just as well”

Side Effects2%

“No side effect”

What buyers complain about

Sleep Quality12%

“I still dont sleep”

Functionality-Overall11%

“Did not work”

Dosage6%

“No one should ever take this high of a dose of this”

Stress/Anxiety5%

“no relief of anxiety”

Side Effects4%

“Had unwanted side effects”

Taste-Overall4%

“it taste like throw up”

Size-Overall4%

“The capsule is small”

Value For Money3%

“It is more expensive”

Vitamin2%

“I honestly didnt expect a supplement to make such a noticeable difference”

Ease Of Chewing/Swallowing2%

“VERY DIFFICULT TO SWALLOW”

Top return reasons

Functionality-Overall37%

Ingredients-Overall15%

Value For Money12%

Sleep Quality6%

Advertised Vs Actual Product6%

Dosage6%

Magnesium6%

Taste-Overall4%

Side Effects3%

Size-Overall3%

Common l theanine questions

Is l theanine profitable to sell on Amazon United States?: The niche generates $17.6M/yr across 22 tracked products. 90-day search growth is +3.8%. Flapen's verdict: Launch it (66/100).
How competitive is the l theanine niche?: 17 brands and 571 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 64% of demand.
What do buyers complain about in l theanine?: Top complaints mined from reviews: Sleep Quality, Functionality-Overall, Dosage. The return rate is 0.0%.
When does demand for l theanine peak?: Demand is steady year-round — the busiest month runs 1.4× the quietest.
What does it cost to enter the l theanine niche?: Listings span $9.86–$66.04; the average listing price is $23.66 (sweet spot $15–$100). The average incumbent carries 5,311 reviews — the moat a new listing must climb.

L Theanine

Is l theanine profitable on Amazon?

l theanine market size & sales

Competition: brands, sellers & click share

l theanine demand & seasonality

Top l theanine search terms shoppers use

Top l theanine products & what they sell for

Top sellers

Newest

Trending

What reviews say buyers love and hate about l theanine

What buyers love

What buyers complain about

Top return reasons

Common l theanine questions

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