---
title: "Serotonin Supplement — $217K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/serotonin-supplement"
last_updated: "2026-08-11T10:26:32.367Z"
locale: en
meta:
description: "Niche score 57/100 · $217K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 57/100 · $217K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Serotonin Supplement — $217K/yr Amazon US Niche (2026) - Flapen"
---
# **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.
Market size 42Growth 19Conversion 58Competition 46Returns 100Price range 88Avg price 95Brand share 73Review moat 40Quality gap 67
**Returns**
**Incredible****0.0%**
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**
**Good****61%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Good****4.3★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Good****4.9%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Okay****57%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Okay****$217K**
$217K/yr · 139K searches
**Review moat**
**Okay****2,544**
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 ~~](https://flapen.com/research/methodology)
## **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.
4K3K seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.5×
[**Open Trend **](https://flapen.com/research/us/health-household/serotonin-supplement/trend)
## **Top serotonin supplement search terms**
- **serotonin supplement**43K/yr-3.0%4.5% conv. - **serotonin**38K/yr-3.5%3.4% conv. - **serotonin booster**11K/yr-38.8%5.4% conv. - **seratonin**6K/yr-14.6%5.4% conv. - **serotonin supplements for women**15K/yr-58.7%3.1% conv. - **serotonin mood support**5K/yr+6.7%6.2% conv. - **serotonin supplements**4K/yr-18.1%2.2% conv. - **serotonina**3K/yr+4.6%1.5% conv. - **serotonin brain food**3K/yr+5.3%4.7% conv. - **serotonin supplements for men**7K/yr-60.9%2.5% conv. [**All search terms **](https://flapen.com/research/us/health-household/serotonin-supplement/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.
0%10%$22K20%$43K30%$65K40%$87K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**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**$26.44**4.1★719 rev](https://www.amazon.com/dp/B09HVBS8WF) [2**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**$67.15**4.3★1,689 rev](https://www.amazon.com/dp/B0B1N72ZR6) [3**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**$9.96**4.4★1,251 rev](https://www.amazon.com/dp/B0B2GR84QT) [4**Natrol 5-HTP 100 mg Time Release Helps Support a Balanced Mood 90 Tablets**Natrol**$15.06**4.6★3,765 rev](https://www.amazon.com/dp/B001JD9DMI) [5**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**$28.04**4.4★2,665 rev](https://www.amazon.com/dp/B0BVXY3SMH)
**~~View all top sellers →~~**
### **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**$19.18**27 rev4mo ago](https://www.amazon.com/dp/B0GSSKL5LY) [**Seeking Health Serotonin Nutrients Supports Healthy Sleep 5-HTP Supplement with Vitamin B6 and Saffron Extract Vegan and Vegetarian (60 Capsules)**Seeking Health**$44.58**15 rev2y ago](https://www.amazon.com/dp/B0CLYD36ZJ) [**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**$28.04**2,665 rev3y ago](https://www.amazon.com/dp/B0BVXY3SMH) [**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**$23.74**1,320 rev3y ago](https://www.amazon.com/dp/B0BCMPVJNK) [**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**$67.15**1,689 rev4y ago](https://www.amazon.com/dp/B0B1N72ZR6)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**BLIVA Serotonin Supplement - 5-HTP Vitamin B6 B12 L-Theanine L-Tryptophan - Daily Mood & Stress Support for Women & Men - 90 Capsules**BLIVA NUTRITION**$19.18**4.1★**▲ 338%**](https://www.amazon.com/dp/B0GSSKL5LY) [**brain feed Serotonin Supplements (30) | 1-a-Day Serotonin Mood Support | 5HTP 100mg Per Tablet from Griffonia Seed Extract | Natural Serotonin Booster | 1 Month Supply**brain feed**$11.30**4.1★**▲ 255%**](https://www.amazon.com/dp/B06XRHTBZ3) [**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**$67.15**4.3★**▲ 189%**](https://www.amazon.com/dp/B0B1N72ZR6) [**Natrol 5-HTP 100 mg Time Release Helps Support a Balanced Mood 90 Tablets**Natrol**$15.06**4.6★**▲ 76%**](https://www.amazon.com/dp/B001JD9DMI) [**THORNE - 5-HTP - Contains Vitamin B6 - Serotonin Support for Sleep & Stress Management* - 5-Hydroxytryptophan Supplement - Third-Party Certified - Gluten Dairy & Soy-Free - 90 Capsules**THORNE**$37.93**4.5★**▲ 32%**](https://www.amazon.com/dp/B00GDXHBS2)
**~~View all trending →~~**
## **What buyers say about serotonin supplement**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**21%
*“better sleep”*
**Stress/Anxiety**11%
*“Very effective at calming stress”*
**Quality-Overall**8%
*“Good Quality”*
**Focus Enhancement**8%
*“Well-rounded mood support blend at a good value”*
**Vitamin**6%
*“Excellent supplement”*
**Efficiency**5%
*“Effective”*
**Advertised Vs Actual Product**3%
*“Feel it works as advertised”*
**Value For Money**3%
*“reasonable price”*
**Side Effects**2%
*“I haven't had any issues”*
**Energy Level**2%
*“Great energy level”*
### **What buyers complain about **
**Sleep Quality**16%
*“This did not help me sleep what so ever”*
**Functionality-Overall**11%
*“Didnt work for me”*
**Side Effects**8%
*“Could make you VERY nauseous”*
**Dosage**7%
*“stopped right after taking it”*
**Acid Regulator/Stomach Ache Relief**6%
*“stomach cramps”*
**Value For Money**5%
*“A waste of money”*
**Allergies**4%
*“I got dizzy and nauseous”*
**Ingredients-Overall**3%
*“Be careful of ingredients”*
**Stress/Anxiety**3%
*“definitely anxiety inducing”*
**Smell**2%
*“there may be a slight odor”*
### **Top return reasons **
**Acid Regulator/Stomach Ache Relief**50%
**Functionality-Overall**25%
**Dosage**25%
## **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.
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