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

The niche generates $347K/yr across 10 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +0.2%. Flapen's verdict: Worth a look (50/100).

How competitive is the caffeine l theanine niche?

8 brands and 14 sellers compete. The top 5 products take 86% of clicks and top 5 brands hold 91% of demand.

What do buyers complain about in caffeine l theanine?

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

When does demand for caffeine l theanine peak?

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

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

Listings span $9.96–$28.42; the average listing price is $19.20 (sweet spot $15–$100). The average incumbent carries 3,910 reviews — the moat a new listing must climb.

caffeine l theanine

Worth a look

Shows low returns (0.0%), but a concentrated shelf (top 5 take 86% of clicks) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Great10.4%

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

Avg price

Great$19.20

avg listing price — sweet spot $15–$100

Price range

Good$9.96–$28.42

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

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Market size

Good$347K

$347K/yr · 173K searches

Review moat

Okay3,910

avg incumbent reviews — the moat a new listing must climb

Growth

Okay+0.2%

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

Brand share

Bad91%

top-5 brand share — brand-locked demand

Competition

Bad86%

top-5 click share — a locked-up shelf

According to Flapen's Amazon United States niche tracking, caffeine l theanine is a $347K/yr Amazon United States market (173K searches/yr). The top 5 brands hold 91% of demand. Verdict: Worth a look — 50/100.

Data updated Jul 8, 2026 · scored weekly · How we score niches

caffeine l theanine market data

Units sold / yr: 15K–20K; avg 1,500–2,000/product
Revenue / yr: $288K–$384K; units × avg price
Conversion rate: 10.4%
Avg BSR: #439
Page quality: 0%
Prime: 100%
Sponsored: 100%
Out of stock: 0.0%
Avg brand age: 59 months
Avg seller age: 157 days

Competition & brand share

The top 5 products capture 86% of clicks — a locked-up shelf that new listings rarely crack.

Brands

8 falling

Sellers

Top-5 brand share

91%

Top 20: 100%

Top-5 click share

86%

Top 20: 100%

Open market

Nutricost37%
Sports Research22%
Vitamatic17%
SmarterVitamins10%
Eu Natural6%
NutraChamps3%
Open — no brand owns it (2 brands, 5%)

Demand & seasonality

Weekly Amazon search volume, last 100 weeks — +0.2% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top caffeine l theanine search terms

caffeine l theanine pills29K/yr +17.1%10.4% conv.
caffeine l theanine17K/yr +7.5%8.0% conv.
l theanine caffeine19K/yr -10.6%7.4% conv.
caffeine and l theanine11K/yr +9.1%8.7% conv.
caffeine pills with l-theanine10K/yr -9.6%10.2% conv.
l theanine and caffeine12K/yr +2.4%6.4% conv.
caffeine and l theanine pills9K/yr +6.5%8.8% conv.
caffeine with l-theanine8K/yr +1.4%11.5% conv.
l-theanine caffeine8K/yr -15.3%6.3% conv.
caffeine theanine7K/yr -6.1%10.5% conv.

All search terms

Top caffeine l theanine 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 10 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Nutricost Caffeine with L-Theanine 100mg of Each 240 Capsules 240 Servings - Non-GMO and Gluten Free

Nutricost$13.864.5★2,396 rev

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$21.884.5★3,550 rev

Vitamatic L-Theanine 200mg with Caffeine 100mg 120 Vegetarian Tablets Nootropic Supplement for Focused Energy & Mental Clarity

Vitamatic$9.964.5★412 rev

SmarterVitamins 200mg Caffeine Pills - MCT Oil from 100% Coconuts + 100mg L-Theanine Energy and Focus Extended Release Capsule 50 Liquid Softgels

SmarterVitamins$28.424.3★11,341 rev

Eu Natural Elite Caffeine Pills with L-Theanine - 100mg Caffeine + 200mg L-Theanine - Jitter-Free Focused Energy & Clean Nootropic Stack - 120 Soft Capsules

Eu Natural$19.624.2★3,162 rev

Newest

by launch date

Caffeine Pills with L-Theanine - 180 Energy Pills for Women & Men - Clean & Long-Lasting Focused Energy - Sustained Release 100mg Caffeine + 200mg L Theanine - No Crash Capsules Vegan Supplement

NutraChamps$19.8493 rev

6mo ago

Vitamatic L-Theanine 200mg with Caffeine 100mg 120 Vegetarian Tablets Nootropic Supplement for Focused Energy & Mental Clarity

Vitamatic$9.96412 rev

4y ago

Vitamatic Caffeine Pills with L-Theanine 300 mg Per Tablet 120 Vegetarian Tablets (Pack of 2 Total 240 Tablets)

Vitamatic$18.31412 rev

4y ago

Nutricost Caffeine with L-Theanine 100mg of Each 240 Capsules 240 Servings - Non-GMO and Gluten Free

Nutricost$13.862,396 rev

5y 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$21.883,550 rev

7y ago

What buyers say about caffeine l theanine

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

What buyers love

Energy Level14%

“Lots of energy”

Focus Enhancement13%

“Improves focus and memory”

Quality-Overall10%

“Good quality and trusted brand”

Caffeine Content9%

“Great Caffeine Capsules”

Sleep Quality5%

“Improved sleep”

Efficiency5%

“Very effective”

Vitamin4%

“Their vitamins are also the highest quality available”

Stress/Anxiety4%

“Its helped so much with anxiety attacks”

Value For Money4%

“great product for a good price”

Dosage3%

“Seems to be a good dosage”

What buyers complain about

Sleep Quality10%

“Makes you very sleepy”

Functionality-Overall10%

“it didnt help”

Energy Level9%

“Does not give You Energy”

Dosage6%

“I cant distinguish if this level of dose is doing any thing”

Taste-Overall5%

“don't want to ingest milk, sugar, flavoring, and maybe don't even like the taste of coffee”

Stress/Anxiety4%

“without the jitters or increased anxiety”

Value For Money4%

“the value feel questionable”

Side Effects3%

“I will react with nausea or something else”

Stuck/Fused Together2%

“many of the capsules were clumped together”

Focus Enhancement2%

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

Top return reasons

Advertised Vs Actual Product30%

Functionality-Overall23%

Ingredients-Overall13%

Value For Money13%

Strength7%

Smell7%