Tryptophan
FailShoppers spend an estimated $37K a year here, so Tryptophan is a Fail.
- Flapen Score
- 42 / 100Ranks 1,521 of 2,035 Health & Personal Care niches · −6 vs the category median of 4842
- Market size
- £37K/yr45K searches / yr
- 90-day growth
- -12.7%search demand this quarter
- Competition
- 81%top-5 click share · 10 brands · 11 sellers
Flapen Score
Tryptophan against its category
The dotted line is the Health & Personal Care average. Past it, Tryptophan is stronger. Inside it, weaker.
Market
The Tryptophan market on Amazon at a glance
Shoppers on Amazon United Kingdom searched for Tryptophan 45K times last year and spent an estimated £37K. The top 5 brands take 81% of clicks. Demand peaks in Oct. Flapen scores it 42 out of 100, a Fail.
01 · Demand
An estimated 8.6% of those searches ended in a purchase.
Shoppers searched for this 45K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. An estimated 8.6% of those searches ended in a purchase. Searches in the last 90 days moved -12.7% against the 90 days before. Searches, conversion and average price together put the market at an estimated £37K a year.
- Searches, last 12 months
- 45K
- Growth, 90 days vs prior 90
- -12.7%
- Conversion, latest week
- 8.6%
- Market size, estimated
- £37Ka year
- Peak month
- October1.5× the quietest month
- Top search term
- tryptophan19K searches a year
02 · Price
A sale here is worth £9.52.
Listings sell for £9.52 on average, from £6.59 to £16.21. Amazon reports units sold in ranges. This niche sold 4K to 5K a year. The average listing sells 250 to 500 of them. At £9.52 that is £2K to £5K a year per listing.
- Average price
- £9.52under the $15 to $100 sweet spot
- Price range
- £6.59–£16.21
- Amazon United Kingdom median price
- £12.12across 27,606 niches
- Units sold a year
- 4K–5K
- Units per listing a year
- 250–500
- Revenue per listing a year
- £2K–£5K
- Returns
- 0.0%of orders · Amazon United Kingdom median 0.6%
03 · Entry bar
The bar here is low.
80% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 3.1% of listings are out of stock. The average listing ranks #683 within Alternative Medicine. It carries 773 reviews at 4.30 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 80%
- Prime listings
- 100%
- Out of stock, average day
- 3.1%
- Average rank
- #683in Alternative Medicine
- Average rating
- 4.30 starsAmazon United Kingdom average 4.36 stars
- Average reviews
- 773per listing
- Listings tracked
- 10
04 · Newcomers
0 of last year's 3 launches cleared the first-year sales bar.
3 products launched here in the last 12 months. 0 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 43 months on average, so the names here are settling in.
- Launched, last 12 months
- 3
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 43 months
Products
Top Tryptophan products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 24, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
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
- Price
- £6.59
- Rating
- 4.5/5
- Reviews
- 114
- Age
- 6y ago

Vegavero L-Tryptophan 220 mg | 120 Capsules (4 Months Supply) | NO Additives | Lab-Tested | Pure Tryptophan Supplement | Vegan
- Price
- £13.73
- Rating
- 4.4/5
- Reviews
- 142
- Age
- 2y ago

L-Tryptophan 220mg | 120 Vegan Tablets | High Strength Amino Acid | Suitable for Vegetarians and Vegans | by Horbaach
- Price
- £7.17
- Rating
- 4.0/5
- Reviews
- 170
- Age
- 5y ago

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
- Price
- £7.26
- Rating
- 4.4/5
- Reviews
- 6,943
- Age
- 3y ago

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
- Price
- £7.08
- Rating
- 4.6/5
- Reviews
- 14
- Age
- 10mo ago
Trending
estimated 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
- Price
- £8.33
- Rating
- 4.4/5
- Reviews
- 30
- Age
- 6mo ago

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
- Price
- £7.08
- Rating
- 4.6/5
- Reviews
- 14
- Age
- 10mo ago

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
- Price
- £7.26
- Rating
- 4.4/5
- Reviews
- 6,943
- Age
- 3y ago

L-Tryptophan 220mg | 120 Vegan Tablets | High Strength Amino Acid | Suitable for Vegetarians and Vegans | by Horbaach
- Price
- £7.17
- Rating
- 4.0/5
- Reviews
- 170
- Age
- 5y ago

NaturaVive+ L-Tryptophan Complex 120 Capsules | One a Day | with Vitamin B6 Niacin and Magnesium | Food Supplement
- Price
- £16.21
- Rating
- 4.2/5
- Reviews
- 14
- Age
- 10mo ago
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
- Price
- £8.33
- Rating
- 4.4/5
- Reviews
- 30
- Age
- 6mo ago

NaturaVive+ L-Tryptophan Complex 120 Capsules | One a Day | with Vitamin B6 Niacin and Magnesium | Food Supplement
- Price
- £16.21
- Rating
- 4.2/5
- Reviews
- 14
- Age
- 10mo ago

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
- Price
- £7.08
- Rating
- 4.6/5
- Reviews
- 14
- Age
- 10mo ago

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
- Price
- £8.24
- Rating
- 4.1/5
- Reviews
- 72
- Age
- 2y ago

Vegavero L-Tryptophan 220 mg | 120 Capsules (4 Months Supply) | NO Additives | Lab-Tested | Pure Tryptophan Supplement | Vegan
- Price
- £13.73
- Rating
- 4.4/5
- Reviews
- 142
- Age
- 2y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 81% of clicks. A locked shelf that new listings rarely crack.
Brands
10 falling
Sellers
11
Est. top-5 brand share
81%
Top 20: 100%
Est. 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
Tryptophan search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Oct · busiest ÷ quietest = 1.5×
Search terms
Top Tryptophan search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- tryptophan19K/yr
- l tryptophan12K/yr
- l-tryptophan10K/yr
- tryptophan supplement4K/yr
Reviews and returns
What reviews say buyers love and hate about Tryptophan
We read the reviews and the return reasons for every product selling here.
“Not enough to be clinically effective at all”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
17 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Tryptophan questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









