Is serotonin supplement profitable to sell on Amazon United States?

The niche generates $217K/yr across 17 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -12.3%. Flapen's verdict: Worth a look (57/100).

How competitive is the serotonin supplement niche?

16 brands and 543 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 61% of demand.

What do buyers complain about in serotonin supplement?

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

When does demand for serotonin supplement peak?

Demand is steady year-round — the busiest month runs 1.5× the quietest.

What does it cost to enter the serotonin supplement niche?

Listings span $9.96–$67.15; the average listing price is $31.88 (sweet spot $15–$100). The average incumbent carries 2,544 reviews — the moat a new listing must climb.

serotonin supplement

Worth a look

Shows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Avg price

Incredible$31.88

avg listing price — sweet spot $15–$100

Price range

Great$9.96–$67.15

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

Brand share

Good61%

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

Quality gap

Good4.3★

avg incumbent rating — lower means beatable quality

Conversion

Good4.9%

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

Competition

Okay57%

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

Market size

Okay$217K

$217K/yr · 139K searches

Review moat

Okay2,544

avg incumbent reviews — the moat a new listing must climb

Growth

Bad-12.3%

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

According to Flapen's Amazon United States niche tracking, serotonin supplement is a $217K/yr Amazon United States market (139K searches/yr). The top 5 brands hold 61% of demand. Verdict: Worth a look — 57/100.

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

serotonin supplement market data

Units sold / yr: 6K–8K; avg 250–500/product
Revenue / yr: $191K–$255K; units × avg price
Conversion rate: 4.9%
Avg BSR: #1,277
Page quality: 0%
Prime: 100%
Sponsored: 71%
Out of stock: 5.0%
Avg brand age: 74 months
Avg seller age: 164 days

Competition & brand share

The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.

Brands

16 rising

Sellers

543

Top-5 brand share

61%

Top 20: 100%

Top-5 click share

57%

Top 20: 100%

Open market

33%

TWINLEAF NUTRITION21%
NATURAL STACKS17%
Double Wood Supplements11%
Natrol6%
Clean Nutraceuticals6%
THORNE6%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -12.3% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.5×

Open Trend

Top serotonin supplement search terms

serotonin supplement43K/yr -3.0%4.5% conv.
serotonin38K/yr -3.5%3.4% conv.
serotonin booster11K/yr -38.8%5.4% conv.
seratonin6K/yr -14.6%5.4% conv.
serotonin supplements for women15K/yr -58.7%3.1% conv.
serotonin mood support5K/yr +6.7%6.2% conv.
serotonin supplements4K/yr -18.1%2.2% conv.
serotonina3K/yr +4.6%1.5% conv.
serotonin brain food3K/yr +5.3%4.7% conv.
serotonin supplements for men7K/yr -60.9%2.5% conv.

All search terms

Top serotonin supplement 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 17 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Natural Serotonin Supplement - Made in USA Manganese Serotonin & Cortisol Manager - Serotonin Booster Vitamin Supplement for Women with 5-HTP Vitamin B6 B12 GABA L Theanine L Tryptophan - 60 Capsules

TWINLEAF NUTRITION$26.444.1★719 rev

Serotonin Brain Food - 1250mg L-Tryptophan & 400mg Rhodiola Rosea Supplement - Mood Support Supplement for Stress Relief - Neurotransmitter Support with Magnesium Glycinate & Zinc - 120 Capsules

NATURAL STACKS$67.154.3★1,689 rev

5HTP Liquid Drops - More Absorbable and Effective Than 5 HTP Capsules (60 Servings of 50mg 99%+ 5-HTP) Serotonin Supplement for Mood Sleep and Relaxation by Double Wood

Double Wood Supplements$9.964.4★1,251 rev

Natrol 5-HTP 100 mg Time Release Helps Support a Balanced Mood 90 Tablets

Natrol$15.064.6★3,765 rev

Clean Nutraceuticals GABA 750mg 5 HTP 200mg L Tryptophan 500mg L Theanine 200mg Ashwagandha SAM-e L-Glycine - Mood Support Vitamins for Women and Men with L-Tyrosine 5-HTP (5-Hydroxytryptophan)

Clean Nutraceuticals$28.044.4★2,665 rev

Newest

by launch date

BLIVA Serotonin Supplement - 5-HTP Vitamin B6 B12 L-Theanine L-Tryptophan - Daily Mood & Stress Support for Women & Men - 90 Capsules

BLIVA NUTRITION$19.1827 rev

4mo ago

Seeking Health Serotonin Nutrients Supports Healthy Sleep 5-HTP Supplement with Vitamin B6 and Saffron Extract Vegan and Vegetarian (60 Capsules)

Seeking Health$44.5815 rev

2y ago

Clean Nutraceuticals GABA 750mg 5 HTP 200mg L Tryptophan 500mg L Theanine 200mg Ashwagandha SAM-e L-Glycine - Mood Support Vitamins for Women and Men with L-Tyrosine 5-HTP (5-Hydroxytryptophan)

Clean Nutraceuticals$28.042,665 rev

3y ago

Organic 5-HTP - 200 mg | 99% 5HTP Concentration Plus Cofactor Vitamin B6 & Lions Mane | Water Extracted from Organic Griffonia Seeds | Supports Mood Cognition & Sleep (60 Capsules | 30 Servings)

Triquetra Health$23.741,320 rev

3y ago

Serotonin Brain Food - 1250mg L-Tryptophan & 400mg Rhodiola Rosea Supplement - Mood Support Supplement for Stress Relief - Neurotransmitter Support with Magnesium Glycinate & Zinc - 120 Capsules

NATURAL STACKS$67.151,689 rev

4y ago

What buyers say about serotonin supplement

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

What buyers love

Sleep Quality21%

“better sleep”

Stress/Anxiety11%

“Very effective at calming stress”

Quality-Overall8%

“Good Quality”

Focus Enhancement8%

“Well-rounded mood support blend at a good value”

Vitamin6%

“Excellent supplement”

Efficiency5%

“Effective”

Advertised Vs Actual Product3%

“Feel it works as advertised”

Value For Money3%

“reasonable price”

Side Effects2%

“I haven't had any issues”

Energy Level2%

“Great energy level”

What buyers complain about

Sleep Quality16%

“This did not help me sleep what so ever”

Functionality-Overall11%

“Didnt work for me”

Side Effects8%

“Could make you VERY nauseous”

Dosage7%

“stopped right after taking it”

Acid Regulator/Stomach Ache Relief6%

“stomach cramps”

Value For Money5%

“A waste of money”

Allergies4%

“I got dizzy and nauseous”

Ingredients-Overall3%

“Be careful of ingredients”

Stress/Anxiety3%

“definitely anxiety inducing”

Smell2%

“there may be a slight odor”

Top return reasons

Acid Regulator/Stomach Ache Relief50%

Functionality-Overall25%

Dosage25%

Common questions

Is serotonin supplement profitable to sell on Amazon United States?: The niche generates $217K/yr across 17 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -12.3%. Flapen's verdict: Worth a look (57/100).
How competitive is the serotonin supplement niche?: 16 brands and 543 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 61% of demand.
What do buyers complain about in serotonin supplement?: Top complaints mined from reviews: Sleep Quality, Functionality-Overall, Side Effects. The return rate is 0.0%.
When does demand for serotonin supplement peak?: Demand is steady year-round — the busiest month runs 1.5× the quietest.
What does it cost to enter the serotonin supplement niche?: Listings span $9.96–$67.15; the average listing price is $31.88 (sweet spot $15–$100). The average incumbent carries 2,544 reviews — the moat a new listing must climb.