---
title: "Tryptophan — £37K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/health-personal-care/tryptophan"
last_updated: "2026-07-31T15:37:43.342Z"
locale: en
meta:
description: "Niche score 42/100 · £37K/yr market · 45K searches/yr · £9.52 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 42/100 · £37K/yr market · 45K searches/yr · £9.52 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Tryptophan — £37K/yr Amazon UK Niche (2026) - Flapen"
---
# **tryptophan**
**Skip it**
A small market ($37K/yr) — this niche doesn't clear our bar today.
Market size 9Growth 19Conversion 81Competition 16Returns 100Price range 13Avg price 29Brand share 40Review moat 68Quality gap 75
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****8.6%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Good****772.7**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****81%**
top-5 brand share — brands hold most of the demand
**Avg price**
**Okay****£9.52**
avg listing price — sweet spot $15–$100
**Growth**
**Bad****-12.7%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****81%**
top-5 click share — a locked-up shelf
**Price range**
**Bad****£6.59–£16.21**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Bad****£37K**
£37K/yr · 45K searches
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=uk&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United Kingdom niche tracking, tryptophan is a £37K/yr Amazon United Kingdom market (45K searches/yr). The top 5 brands hold 81% of demand. Demand peaks in Oct. Verdict: Skip it — 42/100.
Data updated Jul 24, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **tryptophan market data**
- **Units sold / yr**
- **4K–5K**
- avg 250–500/product
- **Revenue / yr**
- **£38K–£48K**
- units × avg price
- **Conversion rate**
- **8.6%**
- **Avg BSR**
- **#683**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **80%**
- **Out of stock**
- **3.1%**
- **Avg brand age**
- **43 months**
- **Avg seller age**
- **184 days**
## **Competition & brand share**
The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**10 **▼falling
**Sellers**
**11**
**Top-5 brand share**
**81%**
Top 20: 100%
**Top-5 click share**
**81%**
Top 20: 100%
**Open market**
**15%**
- ALPHA0134% - Vegavero24% - Horbäach11% - Nutrition Geeks7% - Nutriodol5% - swiss bioenergetics4% - Open — no brand owns it (4 brands, 15%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -12.7% search growth over the last 90 days.
2K2KSpike '24Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Oct · busiest ÷ quietest = 1.5×
[**Open Trend **](https://flapen.com/research/uk/health-personal-care/tryptophan/trend)
## **Top tryptophan search terms**
- **tryptophan**19K/yr-10.2%8.0% conv. - **l tryptophan**12K/yr+4.7%7.8% conv. - **l-tryptophan**10K/yr-30.3%8.5% conv. - **tryptophan supplement**4K/yr-23.5%11.1% conv. [**All search terms **](https://flapen.com/research/uk/health-personal-care/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%10%£4K20%£7K30%£11K40%£15K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**L-Tryptophan 220mg with BioPerine - 90 Vegan Capsules Naturally Fermented L-Tryptophan Supplement with Black Pepper Extract for Increased Bioavailability - 3 Months Supply - By Alpha01**ALPHA01**£6.59**4.5★114 rev](https://www.amazon.co.uk/dp/B0CY9SRVM7) [2**Vegavero L-Tryptophan 220 mg | 120 Capsules (4 Months Supply) | NO Additives | Lab-Tested | Pure Tryptophan Supplement | Vegan**Vegavero**£13.73**4.4★142 rev](https://www.amazon.co.uk/dp/B0CMXQYZ4S) [3**L-Tryptophan 220mg | 120 Vegan Tablets | High Strength Amino Acid | Suitable for Vegetarians and Vegans | by Horbaach**Horbäach**£7.17**4.0★170 rev](https://www.amazon.co.uk/dp/B0924LQM6D) [4**Ashwagandha KSM 66 Complex 3000mg Enhanced with L-Tryptophan & Vitamin B6 (2 Month Supply) Ashwagandha High Strength Capsules with 250mg Extract (Not Gummies or Powder) - Vegan UK Made**Nutrition Geeks**£7.26**4.4★6,943 rev](https://www.amazon.co.uk/dp/B0C111HFF4) [5**Nutriodol Fermentation-Derived L-Tryptophan 220 mg 90 Vegan Capsules | Essential Amino Acid | Clean-Label HPMC Capsules Minimal Excipients | UK-Compliant Dose | 3-Month Supply | EU GMP/ISO Made**Nutriodol**£7.08**4.6★14 rev](https://www.amazon.co.uk/dp/B0FRRPSQ5K)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Ashwagandha High Strength KSM-66 Valerian Root & L-Tryptophan Supplement with Magnesium Zinc & Vitamin B6 UK Made 2 Month Supply 60 Vegan Capsules**STRENGTH & SPICES100% Natural Vegan Food Supplements**£8.33**30 rev6mo ago](https://www.amazon.co.uk/dp/B0GFP49GGQ) [**NaturaVive+ L-Tryptophan Complex 120 Capsules | One a Day | with Vitamin B6 Niacin and Magnesium | Food Supplement**NaturaVive**£16.21**14 rev10mo ago](https://www.amazon.co.uk/dp/B0FTZJ4PDF) [**Nutriodol Fermentation-Derived L-Tryptophan 220 mg 90 Vegan Capsules | Essential Amino Acid | Clean-Label HPMC Capsules Minimal Excipients | UK-Compliant Dose | 3-Month Supply | EU GMP/ISO Made**Nutriodol**£7.08**14 rev10mo ago](https://www.amazon.co.uk/dp/B0FRRPSQ5K) [**L-Tryptophan Sleep Complex with Lemon Balm & Chamomile Enhanced with Magnesium Niacin & Vitamin B6 - Natural Night Complex Alternative to Melatonin - 120 Capsules (4-Month Supply) - Made in the UK**Xspan Labs**£8.24**72 rev2y ago](https://www.amazon.co.uk/dp/B0CV64DPPM) [**Vegavero L-Tryptophan 220 mg | 120 Capsules (4 Months Supply) | NO Additives | Lab-Tested | Pure Tryptophan Supplement | Vegan**Vegavero**£13.73**142 rev2y ago](https://www.amazon.co.uk/dp/B0CMXQYZ4S)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Ashwagandha High Strength KSM-66 Valerian Root & L-Tryptophan Supplement with Magnesium Zinc & Vitamin B6 UK Made 2 Month Supply 60 Vegan Capsules**STRENGTH & SPICES100% Natural Vegan Food Supplements**£8.33**4.4★**▲ 192%**](https://www.amazon.co.uk/dp/B0GFP49GGQ) [**Nutriodol Fermentation-Derived L-Tryptophan 220 mg 90 Vegan Capsules | Essential Amino Acid | Clean-Label HPMC Capsules Minimal Excipients | UK-Compliant Dose | 3-Month Supply | EU GMP/ISO Made**Nutriodol**£7.08**4.6★**▲ 142%**](https://www.amazon.co.uk/dp/B0FRRPSQ5K) [**Ashwagandha KSM 66 Complex 3000mg Enhanced with L-Tryptophan & Vitamin B6 (2 Month Supply) Ashwagandha High Strength Capsules with 250mg Extract (Not Gummies or Powder) - Vegan UK Made**Nutrition Geeks**£7.26**4.4★**▲ 59%**](https://www.amazon.co.uk/dp/B0C111HFF4) [**L-Tryptophan 220mg | 120 Vegan Tablets | High Strength Amino Acid | Suitable for Vegetarians and Vegans | by Horbaach**Horbäach**£7.17**4.0★**▲ 32%**](https://www.amazon.co.uk/dp/B0924LQM6D) [**NaturaVive+ L-Tryptophan Complex 120 Capsules | One a Day | with Vitamin B6 Niacin and Magnesium | Food Supplement**NaturaVive**£16.21**4.2★**— 2%**](https://www.amazon.co.uk/dp/B0FTZJ4PDF)
**~~View all trending →~~**
## **What buyers say about tryptophan**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**20%
*“Helped me sleep”*
**Quality-Overall**14%
*“Excellent product”*
**Stress/Anxiety**8%
*“calming daily stressors”*
**Value For Money**7%
*“Not to expensive”*
**Ease Of Chewing/Swallowing**6%
*“Good value, easily swallowed supplement”*
**Vitamin**5%
*“Good supplement”*
**Ease Of Use**5%
*“Ease of use”*
**Soothing Effect**3%
*“They help me relax”*
**Efficiency**3%
*“Seem effective”*
**Ingredients-Overall**2%
*“Great mixture of ingredients”*
### **What buyers complain about **
**Dosage**13%
*“Not enough to be clinically effective at all”*
**Ingredients-Overall**12%
*“Ingredients have changed”*
**Sleep Quality**10%
*“Disrupted sleep”*
**Side Effects**8%
*“I've found a strange side effect at the outset of taking a capsule, a weird”*
**Advertised Vs Actual Product**7%
*“misleading”*
**Acid Regulator/Stomach Ache Relief**4%
*“However I started noticing lots of bloating, stomach issues and acne”*
**Functionality-Overall**3%
*“Didnt work for me”*
**Quality-Overall**3%
*“Just wish the quality control was a bit better”*
**Size-Overall**3%
*“Just a small thing”*
**Vitamin**3%
*“And explains why so many supplements do absolutely nothing”*
### **Top return reasons **
**Certifications**100%
## **Common questions**
- **Is tryptophan profitable to sell on Amazon United Kingdom?**
- The niche generates £37K/yr across 10 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is -12.7%. Flapen's verdict: Skip it (42/100).
- **How competitive is the tryptophan niche?**
- 10 brands and 11 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 81% of demand.
- **What do buyers complain about in tryptophan?**
- Top complaints mined from reviews: Dosage, Ingredients-Overall, Sleep Quality. The return rate is 0.0%.
- **When does demand for tryptophan peak?**
- Demand peaks in Oct; the busiest month runs 1.5× the quietest.
- **What does it cost to enter the tryptophan niche?**
- Listings span £6.59–£16.21; the average listing price is £9.52 (sweet spot $15–$100). The average incumbent carries 773 reviews — the moat a new listing must climb.
## **Related niches in Health & Personal Care**
- 69 [**cooling towel**](https://flapen.com/research/uk/health-personal-care/cooling-towel)£1.1M/yr>1,000%**Launch it**- 70 [**collagen**](https://flapen.com/research/uk/health-personal-care/collagen)£6.6M/yr-20.1%**Worth a look**- 70 [**dry skin remover feet**](https://flapen.com/research/uk/health-personal-care/dry-skin-remover-feet)£236K/yr+78.2%**Worth a look**- 70 [**stryde knee strap**](https://flapen.com/research/uk/health-personal-care/stryde-knee-strap)£112K/yr>1,000%**Worth a look**- 70 [**libre 2 sensor covers**](https://flapen.com/research/uk/health-personal-care/libre-2-sensor-covers)£240K/yr+67.1%**Worth a look**- 70 [**water retention tablets**](https://flapen.com/research/uk/health-personal-care/water-retention-tablets)£470K/yr+47.2%**Worth a look**[**All Health & Personal Care niches **](https://flapen.com/research/uk/health-personal-care)