Tryptophan
a small market ($37K/yr) — Tryptophan doesn't clear our bar today.
Flapen Score
Is Tryptophan profitable on Amazon?
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.
Tryptophan: the Amazon niche in one read
Everything a seller checks before entering, in three answers.
Is the demand real?
Not really. Search demand moved -12.7% over the last 90 days and 8.6% of searches end in a purchase.
£37K
revenue / yr
Who owns the niche?
The top 5 brands hold 81% of demand, so 19% of the market is open.
19%
open market share
Is there a way in?
Listing quality. The average product page scores 0/100 on content standards. Incumbents average 4.3★ — the gap to enter on.
0/100
page quality · 10 products
Top Tryptophan products & what they sell for
Every tracked product — its share of the shelf, its review moat, and what it sells for.
Top sellers
by 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
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 dateAshwagandha 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: brands, sellers & click 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%)
Tryptophan demand & seasonality
Weekly search volume, with the niche's key stats alongside.
Peak months: Oct · busiest ÷ quietest = 1.5×
Top Tryptophan search terms shoppers use
The exact queries shoppers type, with yearly volume, growth and conversion.
- tryptophan19K/yr
- l tryptophan12K/yr
- l-tryptophan10K/yr
- tryptophan supplement4K/yr
What reviews say buyers love and hate about Tryptophan
What buyers mention most, as a share of all reviews.
What buyers love
73% of reviews“Helped me sleep”
“Excellent product”
“calming daily stressors”
“Not to expensive”
“Good value, easily swallowed supplement”
What buyers complain about
66% of reviews“Not enough to be clinically effective at all”
“Ingredients have changed”
“Disrupted sleep”
“I've found a strange side effect at the outset of taking a capsule, a weird”
“misleading”
Tryptophan return rate & reasons
Why buyers send it back, as a share of all return requests.
0.0%
Return rate
0%
Fixable by listing
The "fixable" share counts expectation-mismatch reasons — size, look, advertised-vs-actual — that better copy and images address.
Common Tryptophan questions
The questions sellers ask about this niche, answered from the tracked metrics.
Related niches
Same-category niches scoring near this one — the next ones worth researching.
Best Flapen score
The highest-scoring niches we track right now, across every category.
