L Cysteine
MaybeAn estimated 0.0% of orders come back. But the top 5 products take 77% of clicks, so L Cysteine is a Maybe.
- Flapen Score
- 50 / 100Top 44% of 14,768 Health & Household niches · +1 vs the category median of 4950
- Market size
- $396K/yr188K searches / yr
- 90-day growth
- -6.0%search demand this quarter
- Competition
- 77%top-5 click share · 9 brands · 34 sellers
Flapen Score
L Cysteine against its category
The dotted line is the Health & Household average. Past it, L Cysteine is stronger. Inside it, weaker.
Market
The L Cysteine market on Amazon at a glance
Shoppers on Amazon United States searched for L Cysteine 188K times last year and spent an estimated $396K. The top 5 brands take 86% of clicks. Flapen scores it 50 out of 100, a Maybe.
01 · Demand
An estimated 11.0% of those searches ended in a purchase.
Shoppers searched for this 188K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 11.0% of those searches ended in a purchase. Searches in the last 90 days moved -6.0% against the 90 days before. Searches, conversion and average price together put the market at an estimated $396K a year.
- Searches, last 12 months
- 188K
- Growth, 90 days vs prior 90
- -6.0%
- Conversion, latest week
- 11.0%
- Market size, estimated
- $396Ka year
- Peak month
- March1.9× the quietest month
- Top search term
- l cysteine52K searches a year
02 · Price
A sale here is worth $19.16.
Listings sell for $19.16 on average, from $10.25 to $36.60. Amazon reports units sold in ranges. This niche sold 15K to 20K a year. The average listing sells 1,250 to 1,500 of them. At $19.16 that is $24K to $29K a year per listing.
- Average price
- $19.16inside the $15 to $100 sweet spot
- Price range
- $10.25–$36.60
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 15K–20K
- Units per listing a year
- 1,250–1,500
- Revenue per listing a year
- $24K–$29K
- Returns
- 0.0%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is reviews.
69% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #1,816 within Amino Acids. It carries 2,733 reviews at 4.55 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 69%
- Prime listings
- 100%
- Out of stock, average day
- 0.0%
- Average rank
- #1,816in Amino Acids
- Average rating
- 4.55 starsAmazon United States average 4.42 stars
- Average reviews
- 2,733per listing
- Listings tracked
- 13
04 · Newcomers
Brands here are established.
The brands on the shelf have sold for 69 months on average, so the names here are established.
- Launched, last 12 months
- 0
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 69 months
Products
Top L Cysteine 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 25, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Nutricost L-Cysteine 1000mg 120 Capsules 60 Servings Gluten-Free
- Price
- $14.77
- Rating
- 4.6/5
- Reviews
- 163
- Age
- 1y ago

Now Supplements L-Cysteine 500 mg 90 Veg Capsules - Healthy Skin Hair and Nails* with Vitamin C
- Price
- $12.36
- Rating
- 4.7/5
- Reviews
- 99
- Age
- 1y ago

Life Extension N-Acetyl-L-Cysteine (NAC) Immune Respiratory Liver Health NAC 600 mg Potent antioxidant Support Free-radicals Easy to Absorb 60 Capsules
- Price
- $10.25
- Rating
- 4.6/5
- Reviews
- 7,821
- Age
- 10y ago

Horbach L-Cysteine 1000mg | 100 Powder Capsules
- Price
- $13.46
- Rating
- 4.4/5
- Reviews
- 958
- Age
- 7y ago

Nutricost N-Acetyl L-Cysteine (NAC) 600mg 180 Capsules
- Price
- $15.75
- Rating
- 4.6/5
- Reviews
- 14,257
- Age
- 10y ago
Trending
estimated 90-day click momentum
Cheers Protect | Daily Liver Supplement for Drinkers with L-Cysteine + DHM | Increase Glutathione Levels | 30 Doses | Cysteine Dihydromyricetin Milk Thistle Prickly Pear B-Vitamins Ginger
- Price
- $29.32
- Rating
- 4.6/5
- Reviews
- 1,121
- Age
- 7y ago

Now Supplements L-Cysteine 500 mg 90 Veg Capsules - Healthy Skin Hair and Nails* with Vitamin C
- Price
- $12.36
- Rating
- 4.7/5
- Reviews
- 99
- Age
- 1y ago

BulkSupplements.com L-Cysteine HCl Powder - NAC Supplement Amino Acid Supplement - Gluten Free 500mg per Serving 250g (8.8 oz) (Pack of 1)
- Price
- $16.93
- Rating
- 4.3/5
- Reviews
- 196
- Age
- 12y ago

BulkSupplements.com NAC 1000 mg Capsules - N-Acetyle Cysteine 1000mg NAC Supplement NAC1000mg - NAC Capsules Gluten Free - 2 Capsules per Serving 180-Day Supply 360 Capsules
- Price
- $20.65
- Rating
- 4.5/5
- Reviews
- 1,055
- Age
- 3y ago

Nutricost L-Cysteine 1000mg 120 Capsules 60 Servings Gluten-Free
- Price
- $14.77
- Rating
- 4.6/5
- Reviews
- 163
- Age
- 1y ago
Newest
by launch date
Now Supplements L-Cysteine 500 mg 90 Veg Capsules - Healthy Skin Hair and Nails* with Vitamin C
- Price
- $12.36
- Rating
- 4.7/5
- Reviews
- 99
- Age
- 1y ago

Nutricost L-Cysteine 1000mg 120 Capsules 60 Servings Gluten-Free
- Price
- $14.77
- Rating
- 4.6/5
- Reviews
- 163
- Age
- 1y ago

NaturaLife Labs N-Acetyl-L-Cysteine (NAC) 1600 mg 100 Capsules - Vegan Non-GMO & Gluten-Free
- Price
- $15.68
- Rating
- 4.7/5
- Reviews
- 754
- Age
- 2y ago

BulkSupplements.com NAC 1000 mg Capsules - N-Acetyle Cysteine 1000mg NAC Supplement NAC1000mg - NAC Capsules Gluten Free - 2 Capsules per Serving 180-Day Supply 360 Capsules
- Price
- $20.65
- Rating
- 4.5/5
- Reviews
- 1,055
- Age
- 3y ago

Cheers Restore | Supplement with DHM + L-Cysteine | Feel Better After Drinking & Support Your Liver | 12 Doses | Dihydromyricetin Cysteine Milk Thistle Prickly Pear B-Vitamins Ginger
- Price
- $34.11
- Rating
- 4.3/5
- Reviews
- 635
- Age
- 5y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 77% of clicks. A locked shelf that new listings rarely crack.
Brands
9 flat
Sellers
34
Est. top-5 brand share
86%
Top 20: 100%
Est. top-5 click share
77%
Top 20: 100%
Open market
8%
- Nutricost39%
- NOW Foods21%
- Life Extension13%
- Horbäach7%
- Cheers6%
- BulkSupplements6%
- Open — no brand owns it (3 brands, 8%)
Demand
L Cysteine search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.9×
Search terms
Top L Cysteine search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- l cysteine52K/yr
- l-cysteine40K/yr
- cysteine24K/yr
- l cysteine supplement19K/yr
- l-cysteine supplement10K/yr
- cystine8K/yr
- cysteine supplement12K/yr
- lcysteine7K/yr
- cisteina3K/yr
- l cystine5K/yr
Reviews and returns
What reviews say buyers love and hate about L Cysteine
We read the reviews and the return reasons for every product selling here.
“strong plastic smell”
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.
16 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 L Cysteine 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









