Is suntheanine profitable to sell on Amazon United States?

The niche generates $757K/yr across 13 tracked products. 90-day search growth is -43.0%. Flapen's verdict: Skip it (48/100).

How competitive is the suntheanine niche?

8 brands and 43 sellers compete. The top 5 products take 79% of clicks and top 5 brands hold 93% of demand.

What do buyers complain about in suntheanine?

Top complaints mined from reviews: Functionality-Overall, Value For Money, Stress/Anxiety. The return rate is 0.0%.

When does demand for suntheanine peak?

Demand peaks in Feb–Mar–Apr; the busiest month runs 3.9× the quietest.

What does it cost to enter the suntheanine niche?

Listings span $11.91–$66.04; the average listing price is $28.36 (sweet spot $15–$100). The average incumbent carries 4,617 reviews — the moat a new listing must climb.

suntheanine

Skip it

Soft demand (-43.0% this quarter) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Incredible12.8%

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

Avg price

Incredible$28.36

avg listing price — sweet spot $15–$100

Price range

Great$11.91–$66.04

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

Market size

Good$757K

$757K/yr · 208K searches

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Review moat

Bad4,617.08

avg incumbent reviews — the moat a new listing must climb

Competition

Bad79%

top-5 click share — a locked-up shelf

Brand share

Bad93%

top-5 brand share — brand-locked demand

Growth

Bad-43.0%

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

According to Flapen's Amazon United States niche tracking, suntheanine is a $757K/yr Amazon United States market (208K searches/yr). The top 5 brands hold 93% of demand. Demand peaks in Feb–Mar–Apr. Verdict: Skip it — 48/100.

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

suntheanine market data

Units sold / yr: 25K–30K; avg 3,000–4,000/product
Revenue / yr: $709K–$851K; units × avg price
Conversion rate: 12.8%
Avg BSR: #261
Page quality: 0%
Prime: 100%
Sponsored: 69%
Out of stock: 0.0%
Avg brand age: 74 months
Avg seller age: 157 days

Competition & brand share

The top 5 products capture 79% of clicks — a locked-up shelf that new listings rarely crack.

Brands

8 falling

Sellers

Top-5 brand share

93%

Top 20: 100%

Top-5 click share

79%

Top 20: 100%

Open market

Natural Factors38%
Sports Research34%
Doctor's BEST12%
Swanson5%
NOW Foods3%
Nutricost3%
Open — no brand owns it (2 brands, 4%)

Demand & seasonality

Weekly Amazon search volume, last 101 weeks — -43.0% search growth over the last 90 days.

Peak months: Feb, Mar, Apr · busiest ÷ quietest = 3.9×

Open Trend

Top suntheanine search terms

suntheanine103K/yr -60.2%10.0% conv.
suntheanine l-theanine31K/yr -37.1%10.3% conv.
sports research l theanine24K/yr -6.0%13.4% conv.
suntheanine l-theanine 200mg10K/yr -10.8%10.3% conv.
doctors best l theanine8K/yr +8.3%14.2% conv.
sports research l-theanine7K/yr +10.7%14.6% conv.
l theanine sports research6K/yr +14.4%11.9% conv.
l theanine suntheanine7K/yr -9.0%8.0% conv.
sun theanine4K/yr -30.7%13.4% conv.
sun theanine l-theanine4K/yr -47.4%13.0% conv.

All search terms

Top suntheanine 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 13 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Natural Factors Suntheanine L-Theanine 100 mg - Health Supplement for Calm Outlook - L-Theanine Supplement Supports Relaxing Sleep & Aids Against Drowsiness - 60 Chewable Tablets (30 Servings)

Natural Factors$18.374.6★1,820 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

Doctors Best L-Theanine Contains Suntheanine Helps Reduce Stress & Sleep Non-GMO Gluten Free Vegan 150 mg (DRB-00197) 90 Count

Doctor's BEST$20.584.6★2,490 rev

Natural Factors Suntheanine L-Theanine 100 mg - Health Supplement for Calm Outlook - L-Theanine Supplement Supports Relaxing Sleep & Aids Against Drowsiness - 120 Chewable Tablets (60 Servings)

Natural Factors$34.904.6★1,820 rev

Swanson Double Potency Suntheanine L-Theanine Calm and Focus Supplement for Stress-Prone Professionals Seeking Balanced Wellbeing - 200 mg (60 Veggie Capsules)

Swanson$21.084.4★136 rev

Newest

by launch date

Doctors Best L-Theanine Caps 200mg for Men & Women - L Theanine AlphaWave Supplement for Calm & Focus Support Helps Reduce Stress Vegan Gluten Free Soy Free Non GMO - 60 Veg Capsules

Doctor's BEST$15.60288 rev

2y ago

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 120 Count

Sports Research$36.5415,233 rev

2y ago

Sports Research L-Theanine Supplement with Caffeine & Coconut MCT Oil - Focused Energy Alertness & Relaxation Without Drowsiness - 200mg L Theanine 100mg Organic Caffeine - 60 Liquid Softgels

Sports Research$22.033,580 rev

7y ago

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

Nutricost$11.919,940 rev

10y ago

Natural Factors Suntheanine L-Theanine 100 mg - Health Supplement for Calm Outlook - L-Theanine Supplement Supports Relaxing Sleep & Aids Against Drowsiness - 120 Chewable Tablets (60 Servings)

Natural Factors$34.901,820 rev

10y ago

What buyers say about suntheanine

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

What buyers love

Quality-Overall14%

“Good quality and trusted brand”

Sleep Quality14%

“Helps with sleep”

Stress/Anxiety11%

“Works for stress”

Focus Enhancement8%

“Great for focus”

Efficiency6%

“Very effective”

Value For Money4%

“Worth it”

Vitamin4%

“Great effective supplement”

Soothing Effect4%

“good calming”

Taste-Overall3%

“no after taste”

Ease Of Chewing/Swallowing3%

“Not hard to swallow”

What buyers complain about

Functionality-Overall9%

“Not effective”

Value For Money7%

“It is more expensive”

Stress/Anxiety5%

“Im struggling with terrible anxiety. GAD”

Taste-Overall5%

“Dont love the taste”

Dosage4%

“I may trying decreasing amount”

Sleep Quality4%

“Sleep aid not worth buying”

Focus Enhancement3%

“I did not feel any different in focus and relaxation”

Side Effects3%

“We experienced unpleasant side effects”

Artificial Sweeteners3%

“Added sugar artificial 3g per dose”

Quality-Overall3%

“garbage”

Top return reasons

Functionality-Overall30%

Ingredients-Overall20%

Value For Money10%

Durability5%

Advertised Vs Actual Product5%

Strength5%

Dosage5%

Accuracy-Overall5%

Color5%

Quality-Overall5%

Common questions

Is suntheanine profitable to sell on Amazon United States?: The niche generates $757K/yr across 13 tracked products. 90-day search growth is -43.0%. Flapen's verdict: Skip it (48/100).
How competitive is the suntheanine niche?: 8 brands and 43 sellers compete. The top 5 products take 79% of clicks and top 5 brands hold 93% of demand.
What do buyers complain about in suntheanine?: Top complaints mined from reviews: Functionality-Overall, Value For Money, Stress/Anxiety. The return rate is 0.0%.
When does demand for suntheanine peak?: Demand peaks in Feb–Mar–Apr; the busiest month runs 3.9× the quietest.
What does it cost to enter the suntheanine niche?: Listings span $11.91–$66.04; the average listing price is $28.36 (sweet spot $15–$100). The average incumbent carries 4,617 reviews — the moat a new listing must climb.