Is l theanine kids profitable to sell on Amazon United States?

The niche generates $194K/yr across 7 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -31.6%. Flapen's verdict: Skip it (43/100).

How competitive is the l theanine kids niche?

7 brands and 585 sellers compete. The top 5 products take 93% of clicks and top 5 brands hold 93% of demand.

What do buyers complain about in l theanine kids?

Top complaints mined from reviews: Taste-Overall, Functionality-Overall, Flavor. The return rate is 0.0%.

When does demand for l theanine kids peak?

Demand peaks in Oct–Nov–Dec; the busiest month runs 4.4× the quietest.

What does it cost to enter the l theanine kids niche?

Listings span $11.55–$24.51; the average listing price is $19.24 (sweet spot $15–$100). The average incumbent carries 1,223 reviews — the moat a new listing must climb.

L Theanine Kids

Skip it

A concentrated shelf (top 5 take 93% of clicks) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Avg price

Great$19.24

avg listing price — sweet spot $15–$100

Conversion

Good7.0%

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

Price range

Good$11.55–$24.51

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

Review moat

Good1,223

avg incumbent reviews — the moat a new listing must climb

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Market size

Okay$194K

$194K/yr · 144K searches

Brand share

Bad93%

top-5 brand share — brand-locked demand

Growth

Bad-31.6%

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

Competition

Bad93%

top-5 click share — a locked-up shelf

Is l theanine kids profitable on Amazon?

According to Flapen's Amazon United States niche tracking, l theanine kids is a $194K/yr Amazon United States market (144K searches/yr). The top 5 brands hold 93% of demand. Demand peaks in Oct–Nov–Dec. Verdict: Skip it — 43/100.

Data updated Jul 28, 2026 · scored weekly · How we score niches

l theanine kids market size & sales

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

Units sold / yr: 8K–10K; avg 500–750/product
Revenue / yr: $154K–$192K; units × avg price
Conversion rate: 7.0%
Avg BSR: #111
Page quality: 0%
Prime: 100%
Sponsored: 100%
Out of stock: 0.0%
Avg brand age: 55 months
Avg seller age: 131 days

Competition: brands, sellers & click share

The top 5 products capture 93% of clicks — a locked-up shelf that new listings rarely crack.

Brands

7 falling

Sellers

585

Top-5 brand share

93%

Top 20: 100%

Top-5 click share

93%

Top 20: 100%

Open market

MARYRUTH'S61%
OLLY10%
Bigelow Tea9%
Renzo's8%
softbear5%
GOJOY NATURALS4%
Open — no brand owns it (1 brand, 3%)

l theanine kids demand & seasonality

Weekly Amazon search volume, last 104 weeks — -31.6% search growth over the last 90 days.

Peak months: Oct, Nov, Dec · busiest ÷ quietest = 4.4×

Open Trend

Top l theanine kids search terms shoppers use

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

mary ruth drops16K/yr -19.1%0.4% conv.
l theanine for kids28K/yr -43.6%3.3% conv.
l theanine tea12K/yr -23.5%1.8% conv.
l theanine kids13K/yr -20.8%4.2% conv.
l-theanine for kids16K/yr -39.5%3.8% conv.
mary ruth l theanine drops7K/yr -15.5%17.6% conv.
l-theanine tea6K/yr -6.5%2.4% conv.
kids l theanine6K/yr -28.9%3.6% conv.
mary ruth l theanine8K/yr -53.5%14.5% conv.
mary ruth liquid drops4K/yr -23.0%0.2% conv.

All search terms

Top l theanine kids 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 7 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

MaryRuths L Theanine 200mg Liquid Drops for Adults & Kids 30 Servings

MARYRUTH'S$19.994.7★1,319 rev

OLLY Kids Chillax Gummy For a Calm and Relaxed Mood* Magnesium L-Theanine Lemon Balm Extract Chewable Supplement Sherbet Flavored 25 Day Supply - 50 Count (Packaging May Vary)

OLLY$11.554.4★5,684 rev

Bigelow Whispering Wildflowers Herbal Tea Plus L-Theanine Supports Stress Relief & Relaxation Caffeine-Free Kosher Gluten Free & Non-GMO 18 Tea Bags 0.9 Ounce (Pack of 6)

Bigelow Tea$20.644.8★266 rev

Renzos Captain Calm Kids Magnesium Supplement with L-Theanine Dissolvable Kids Vitamins for Relaxation and Mood Support Sugar-Free Melty Tabs Green Apple Flavor 60-Count (1-2 Month Supply)

Renzo's$19.364.4★361 rev

softbear L-Theanine 400mg Gummies for Kids & Adults L Theanine Supplement with Ashwagandha GABA 5-HTP Supports Calm & Relax & Focus Sugar-Free/Vegan/GMO-Free Strawberry Flavor 60 Count

softbear$16.894.4★39 rev

Newest

by launch date

softbear L-Theanine 400mg Gummies for Kids & Adults L Theanine Supplement with Ashwagandha GABA 5-HTP Supports Calm & Relax & Focus Sugar-Free/Vegan/GMO-Free Strawberry Flavor 60 Count

softbear$16.8939 rev

5mo ago

Renzos Captain Calm Kids Magnesium Supplement with L-Theanine Dissolvable Kids Vitamins for Relaxation and Mood Support Sugar-Free Melty Tabs Green Apple Flavor 60-Count (1-2 Month Supply)

Renzo's$19.36361 rev

1y ago

kindnature L-Theanine 200mg Gummies for Kids 4+ & Adults Pure Single-Ingredient Calm & Focus Chewables Clinical Dose Non-Drowsy Relaxation Vegan Mixed Berry Non-GMO 60 Ct

kindnature$21.73237 rev

2y ago

GOJOY NATURALS Kids Focus Gummies Saffron Magnesium Glycinate L-Theanine & Inositol Supplement for Kids & Teens Focus Attention & Calm Vegan Sugar-Free Non-GMO

GOJOY NATURALS$24.51655 rev

2y ago

Bigelow Whispering Wildflowers Herbal Tea Plus L-Theanine Supports Stress Relief & Relaxation Caffeine-Free Kosher Gluten Free & Non-GMO 18 Tea Bags 0.9 Ounce (Pack of 6)

Bigelow Tea$20.64266 rev

3y ago

What reviews say buyers love and hate about l theanine kids

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

What buyers love

Taste-Overall18%

“Good taste”

Sleep Quality10%

“better sleep quality”

Focus Enhancement8%

“Natural focus”

Flavor7%

“Great orange flavor”

Quality-Overall6%

“Good staff”

Stress/Anxiety5%

“I ordered these for help with stress”

Soothing Effect4%

“Helps Focus and Calm”

Advertised Vs Actual Product4%

“Worked as expected”

Value For Money3%

“Great price”

Ease Of Chewing/Swallowing3%

“soft, and chewy”

What buyers complain about

Taste-Overall17%

“it taste like throw up”

Functionality-Overall13%

“Didnt work”

Flavor5%

“Flavor is not great”

Sleep Quality4%

“She said they dont make her feel sleepy”

Side Effects4%

“It caused her to have severe stomach upset with diarrhea”

Value For Money3%

“May as well be expensive gummy bears”

Smell2%

“They also smell really horrible”

Size-Overall2%

“Too big and its 2 every time my son was upset about it and stop having them”

Stale/Rotten/Spoiled2%

“Only got to take a few of these before they started looking gross”

Heart Health2%

“causes severe heartburn”

Top return reasons

Taste-Overall35%

Functionality-Overall27%

Value For Money15%

Age Suitability8%

Color8%

Ethical Trade/Fair Trade8%

Common l theanine kids questions

Is l theanine kids profitable to sell on Amazon United States?: The niche generates $194K/yr across 7 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -31.6%. Flapen's verdict: Skip it (43/100).
How competitive is the l theanine kids niche?: 7 brands and 585 sellers compete. The top 5 products take 93% of clicks and top 5 brands hold 93% of demand.
What do buyers complain about in l theanine kids?: Top complaints mined from reviews: Taste-Overall, Functionality-Overall, Flavor. The return rate is 0.0%.
When does demand for l theanine kids peak?: Demand peaks in Oct–Nov–Dec; the busiest month runs 4.4× the quietest.
What does it cost to enter the l theanine kids niche?: Listings span $11.55–$24.51; the average listing price is $19.24 (sweet spot $15–$100). The average incumbent carries 1,223 reviews — the moat a new listing must climb.