tryptophan
Worth a lookShows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Incredible12.7%search→purchase rate — share of searches ending in a sale
Avg price
Incredible$26.33avg listing price — sweet spot $15–$100
Market size
Great$1.2M$1.2M/yr · 367K searches
Price range
Great$9.83–$119.23cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Good71%top-5 brand share — brands hold most of the demand
Review moat
Good1,479.57avg incumbent reviews — the moat a new listing must climb
Competition
Okay55%top-5 click share — leaders hold, buyers still browse
Quality gap
Okay4.5★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
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.No pronounced peak months · busiest ÷ quietest = 1.2×
Top tryptophan search terms
- tryptophan106K/yr
- l tryptophan63K/yr
- l-tryptophan45K/yr
- tryptophan supplement51K/yr
- triptofano18K/yr
- l tryptophan 500mg13K/yr
- triptofan supplements15K/yr
- tryptophan supplement for sleep15K/yr
- l tryptophan 1000mg8K/yr
- l-tryptophan 500mg10K/yr
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.
All 21 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Nutricost L-Tryptophan 500mg 120 Capsules - with BioPerine Gluten Free Non-GMO
Nutricost$14.724.5★2,420 rev
NOW Foods Supplements L-Tryptophan 500 mg Encourages Positive Mood* Supports Relaxation* 120 Veg Capsules
NOW Foods$17.774.5★5,743 rev
Pure Encapsulations L-Tryptophan | Amino Acid Supplement for Relaxation Serotonin Support PMS and Sleep* | 90 Capsules
Pure Encapsulations$69.354.6★167 rev
Horbach L Tryptophan 1500mg Capsules | 240 Count | Nighttime Formula | Non-GMO Gluten Free Supplement
Horbäach$19.654.4★2,393 rev
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$23.804.5★304 rev
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$13.2263 rev
Bronson L-Tryptophan 500 MG High Potency Essential Amino Acid Supports Relaxation & Positive Mood Support Non-GMO 60 Capsules
Bronson$10.00230 rev
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$18.71219 rev
Amazing Formulas L-Tryptophan 1000mg Tablets Supplement | Non-GMO | Gluten Free | Made in USA (240 Count)
Amazing Nutrition$34.792,084 rev
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$27.952,629 rev
Trending
90-day click momentumL-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$13.224.2★
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$23.804.5★
Pure Encapsulations L-Tryptophan | Amino Acid Supplement for Relaxation Serotonin Support PMS and Sleep* | 180 Capsules
Pure Encapsulations$119.234.6★
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$18.714.5★
NOW Foods Supplements L-Tryptophan 500 mg Encourages Positive Mood* Supports Relaxation* 60 Veg Capsules
NOW Foods$12.074.5★
What buyers say about tryptophan
What buyers praise and complain about, mined from review topics.What buyers love
“Helps me sleep”
“Great brand with quality supplements”
“Very effective at calming stress”
“reasonable price”
“Actually helped improve my focus”
“Excellent supplement”
“Does exactly what it advertises”
“Effective”
“I found that just taking a single 500mg capsule was enough for me”
“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
“Did not work for sleep”
“Didn't work for me”
“Since the dose is pretty high”
“Made me nauseated”
“Price is absolutely insane”
“However, I took off three stars because of as others have said, the black pepper ingredient is too much”
“Can cause stomach issues”
“Ineffective”
“definitely anxiety inducing”
“I am appalled by the lack of quality control for this product”
Top return reasons
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.