---
title: "Tryptophan — $1.2M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/tryptophan"
last_updated: "2026-08-10T12:06:46.298Z"
locale: en
meta:
description: "Niche score 64/100 · $1.2M/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 64/100 · $1.2M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Tryptophan — $1.2M/yr Amazon US Niche (2026) - Flapen"
---
# **tryptophan**
**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 81Growth 20Conversion 95Competition 49Returns 100Price range 77Avg price 95Brand share 58Review moat 51Quality gap 47
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****12.7%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Incredible****$26.33**
avg listing price — sweet spot $15–$100
**Market size**
**Great****$1.2M**
$1.2M/yr · 367K searches
**Price range**
**Great****$9.83–$119.23**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****71%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Good****1,479.57**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Okay****55%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-10.4%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, tryptophan is a $1.2M/yr Amazon United States market (367K searches/yr). The top 5 brands hold 71% of demand. Verdict: Worth a look — 64/100.
Data updated Jul 12, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **tryptophan market data**
- **Units sold / yr**
- **40K–50K**
- avg 1,500–2,000/product
- **Revenue / yr**
- **$1.1M–$1.3M**
- units × avg price
- **Conversion rate**
- **12.7%**
- **Avg BSR**
- **#868**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **76%**
- **Out of stock**
- **0.6%**
- **Avg brand age**
- **72 months**
- **Avg seller age**
- **157 days**
## **Competition & brand share**
The top 5 products take 55% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**16 **▼falling
**Sellers**
**39**
**Top-5 brand share**
**71%**
Top 20: 100%
**Top-5 click share**
**55%**
Top 20: 99%
**Open market**
**24%**
- NOW Foods28% - Nutricost19% - Life Extension8% - Pure Encapsulations8% - BulkSupplements7% - Horbäach6%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -10.4% search growth over the last 90 days.
12K8KSpike '24 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.2×
[**Open Trend **](https://flapen.com/research/us/health-household/tryptophan/trend)
## **Top tryptophan search terms**
- **tryptophan**106K/yr-2.5%10.5% conv. - **l tryptophan**63K/yr-11.9%12.0% conv. - **l-tryptophan**45K/yr-10.9%11.2% conv. - **tryptophan supplement**51K/yr-23.8%10.9% conv. - **triptofano**18K/yr+8.7%2.5% conv. - **l tryptophan 500mg**13K/yr+8.5%17.9% conv. - **triptofan supplements**15K/yr-24.5%8.3% conv. - **tryptophan supplement for sleep**15K/yr-20.1%9.1% conv. - **l tryptophan 1000mg**8K/yr+38.3%12.5% conv. - **l-tryptophan 500mg**10K/yr-10.2%13.8% conv. [**All search terms **](https://flapen.com/research/us/health-household/tryptophan/search-terms)
## **Top tryptophan 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%5%$61K10%$122K15%$183K20%$244K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 21 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Nutricost L-Tryptophan 500mg 120 Capsules - with BioPerine Gluten Free Non-GMO**Nutricost**$14.72**4.5★2,420 rev](https://www.amazon.com/dp/B01M03S1JU) [2**NOW Foods Supplements L-Tryptophan 500 mg Encourages Positive Mood* Supports Relaxation* 120 Veg Capsules**NOW Foods**$17.77**4.5★5,743 rev](https://www.amazon.com/dp/B0019LWV56) [3**Pure Encapsulations L-Tryptophan | Amino Acid Supplement for Relaxation Serotonin Support PMS and Sleep* | 90 Capsules**Pure Encapsulations**$69.35**4.6★167 rev](https://www.amazon.com/dp/B07H8PYJNH) [4**Horbach L Tryptophan 1500mg Capsules | 240 Count | Nighttime Formula | Non-GMO Gluten Free Supplement**Horbäach**$19.65**4.4★2,393 rev](https://www.amazon.com/dp/B07JNGTF3W) [5**Life Extension Optimized Tryptophan Plus 1000mg - L-Tryptophan Supplement with Niacin and L-Lysine for Healthy Sleep & Stress Response Gluten-Free Non-GMO Vegetarian - 90 Capsules**Life Extension**$23.80**4.5★304 rev](https://www.amazon.com/dp/B00CBFC9T2)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**L-Tryptophan Capsules 1000mg per Serving - L Tryptophan Supplement for Sleep Promotes Relaxation & Emotional Well-Being for Women & Men - Potent Pure Mood Support Supplement for Adults - 120 Count**Natures Craft**$13.22**63 rev1y ago](https://www.amazon.com/dp/B0FDXBQPKC) [**Bronson L-Tryptophan 500 MG High Potency Essential Amino Acid Supports Relaxation & Positive Mood Support Non-GMO 60 Capsules**Bronson**$10.00**230 rev2y ago](https://www.amazon.com/dp/B0CKZG26D7) [**BulkSupplements.com L-Tryptophan Capsules - Tryptophan Supplement L-Trptophan 500mg - Amino Acid Supplement Gluten Free - 1 Capsule per Serving 240 Capsules (Pack of 1)**BulkSupplements**$18.71**219 rev2y ago](https://www.amazon.com/dp/B0CKWLK292) [**Amazing Formulas L-Tryptophan 1000mg Tablets Supplement | Non-GMO | Gluten Free | Made in USA (240 Count)**Amazing Nutrition**$34.79**2,084 rev2y ago](https://www.amazon.com/dp/B0CKRW54L2) [**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**$27.95**2,629 rev3y ago](https://www.amazon.com/dp/B0BVXY3SMH)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**L-Tryptophan Capsules 1000mg per Serving - L Tryptophan Supplement for Sleep Promotes Relaxation & Emotional Well-Being for Women & Men - Potent Pure Mood Support Supplement for Adults - 120 Count**Natures Craft**$13.22**4.2★**▲ 104%**](https://www.amazon.com/dp/B0FDXBQPKC) [**Life Extension Optimized Tryptophan Plus 1000mg - L-Tryptophan Supplement with Niacin and L-Lysine for Healthy Sleep & Stress Response Gluten-Free Non-GMO Vegetarian - 90 Capsules**Life Extension**$23.80**4.5★**▲ 44%**](https://www.amazon.com/dp/B00CBFC9T2) [**Pure Encapsulations L-Tryptophan | Amino Acid Supplement for Relaxation Serotonin Support PMS and Sleep* | 180 Capsules**Pure Encapsulations**$119.23**4.6★**▲ 37%**](https://www.amazon.com/dp/B07H8N948R) [**BulkSupplements.com L-Tryptophan Capsules - Tryptophan Supplement L-Trptophan 500mg - Amino Acid Supplement Gluten Free - 1 Capsule per Serving 240 Capsules (Pack of 1)**BulkSupplements**$18.71**4.5★**▲ 16%**](https://www.amazon.com/dp/B0CKWLK292) [**NOW Foods Supplements L-Tryptophan 500 mg Encourages Positive Mood* Supports Relaxation* 60 Veg Capsules**NOW Foods**$12.07**4.5★**▲ 13%**](https://www.amazon.com/dp/B000X24T4S)
**~~View all trending →~~**
## **What buyers say about tryptophan**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**26%
*“Helps me sleep”*
**Quality-Overall**13%
*“Great brand with quality supplements”*
**Stress/Anxiety**8%
*“Very effective at calming stress”*
**Value For Money**5%
*“reasonable price”*
**Focus Enhancement**4%
*“Actually helped improve my focus”*
**Vitamin**4%
*“Excellent supplement”*
**Advertised Vs Actual Product**3%
*“Does exactly what it advertises”*
**Efficiency**3%
*“Effective”*
**Dosage**3%
*“I found that just taking a single 500mg capsule was enough for me”*
**Ingredients-Overall**3%
*“I like that it combines several ingredients in one bottle, including GABA, 5-HTP, L-tryptophan, L-theanine, and ashwagandha, instead of having to buy each one separately”*
### **What buyers complain about **
**Sleep Quality**27%
*“Did not work for sleep”*
**Functionality-Overall**9%
*“Didn't work for me”*
**Dosage**7%
*“Since the dose is pretty high”*
**Side Effects**6%
*“Made me nauseated”*
**Value For Money**6%
*“Price is absolutely insane”*
**Ingredients-Overall**4%
*“However, I took off three stars because of as others have said, the black pepper ingredient is too much”*
**Acid Regulator/Stomach Ache Relief**4%
*“Can cause stomach issues”*
**Strength**3%
*“Ineffective”*
**Stress/Anxiety**3%
*“definitely anxiety inducing”*
**Quality-Overall**3%
*“I am appalled by the lack of quality control for this product”*
### **Top return reasons **
**Functionality-Overall**40%
**Acid Regulator/Stomach Ache Relief**20%
**Sleep Quality**20%
**Quality-Overall**10%
**Comfort-Overall**10%
## **Common questions**
- **Is tryptophan profitable to sell on Amazon United States?**
- The niche generates $1.2M/yr across 21 tracked products. 90-day search growth is -10.4%. Flapen's verdict: Worth a look (64/100).
- **How competitive is the tryptophan niche?**
- 16 brands and 39 sellers compete. The top 5 products take 55% of clicks and top 5 brands hold 71% of demand.
- **What do buyers complain about in tryptophan?**
- Top complaints mined from reviews: Sleep Quality, Functionality-Overall, Dosage. The return rate is 0.0%.
- **When does demand for tryptophan peak?**
- Demand is steady year-round — the busiest month runs 1.2× the quietest.
- **What does it cost to enter the tryptophan niche?**
- Listings span $9.83–$119.23; the average listing price is $26.33 (sweet spot $15–$100). The average incumbent carries 1,480 reviews — the moat a new listing must climb.
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