Nac
MaybeShoppers spend an estimated $13.0M a year here. But demand is soft, at -16.8% this quarter, so Nac is a Maybe.
- Flapen Score
- 61 / 100Top 9% of 14,768 Health & Household niches · +12 vs the category median of 4961
- Market size
- $13.0M/yr4.5M searches / yr
- 90-day growth
- -16.8%search demand this quarter
- Competition
- 57%top-5 click share · 17 brands · 59 sellers
Flapen Score
Nac against its category
The dotted line is the Health & Household average. Past it, Nac is stronger. Inside it, weaker.
Market
The Nac market on Amazon at a glance
Shoppers on Amazon United States searched for Nac 4.5M times last year and spent an estimated $13.0M. The top 5 brands take 80% of clicks. Flapen scores it 61 out of 100, a Maybe.
01 · Demand
An estimated 13.1% of those searches ended in a purchase.
Shoppers searched for this 4.5M times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 13.1% of those searches ended in a purchase. Searches in the last 90 days moved -16.8% against the 90 days before. Searches, conversion and average price together put the market at an estimated $13.0M a year.
- Searches, last 12 months
- 4.5M
- Growth, 90 days vs prior 90
- -16.8%
- Conversion, latest week
- 13.1%
- Market size, estimated
- $13.0Ma year
- Peak month
- January1.4× the quietest month
- Top search term
- nac supplement1.8M searches a year
02 · Price
A sale here is worth $22.11.
Listings sell for $22.11 on average, from $10.25 to $53.64. Amazon reports units sold in ranges. This niche sold 600K to 800K a year. The average listing sells 25,000 to 30,000 of them. At $22.11 that is $553K to $663K a year per listing.
- Average price
- $22.11inside the $15 to $100 sweet spot
- Price range
- $10.25–$53.64
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 600K–800K
- Units per listing a year
- 25,000–30,000
- Revenue per listing a year
- $553K–$663K
- Returns
- 0.0%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is reviews.
81% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 1.1% of listings are out of stock. The average listing ranks #141 within Amino Acids. It carries 5,644 reviews at 4.59 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 81%
- Prime listings
- 100%
- Out of stock, average day
- 1.1%
- Average rank
- #141in Amino Acids
- Average rating
- 4.59 starsAmazon United States average 4.42 stars
- Average reviews
- 5,644per listing
- Listings tracked
- 26
04 · Newcomers
2 of last year's 2 launches cleared the first-year sales bar.
2 products launched here in the last 12 months. 2 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 55 months on average, so the names here are settling in.
- Launched, last 12 months
- 2
- Successful launches
- 2Amazon's first-year sales bar
- Average brand age
- 55 months
Products
Top Nac 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 N-Acetyl L-Cysteine (NAC) 600mg 180 Capsules
- Price
- $15.75
- Rating
- 4.6/5
- Reviews
- 14,257
- Age
- 10y ago

NOW Supplements NAC (N-Acetyl Cysteine) 600 mg with Selenium 250 Veg Capsules
- Price
- $20.69
- Rating
- 4.6/5
- Reviews
- 20,966
- Age
- 24y 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

Pure Encapsulations NAC 600 mg - N-Acetyl Cysteine NAC Supplement for Lung Health & Immune Support Liver Support & Antioxidants* - with Freeform N-Acetyl-L-Cysteine - 90 Capsules
- Price
- $36.60
- Rating
- 4.7/5
- Reviews
- 3,870
- Age
- 18y ago

NOW Supplements NAC (N-Acetyl Cysteine) 600 mg with Selenium 100 Capsules
- Price
- $12.00
- Rating
- 4.6/5
- Reviews
- 20,966
- Age
- 22y ago
Trending
estimated 90-day click momentum
Micro Ingredients NAC Supplement 600mg Per Serving with NAD+ & Coconut Oil 300 Softgels | 2-in-1 N Acetyl L Cysteine Plus Nicotinamide Forms | NAD Supplements for Women & Men | Non-GMO Gluten Free
- Price
- $24.91
- Rating
- 4.5/5
- Reviews
- 239
- Age
- 11mo ago

Pure Encapsulations NAC 600 mg - N-Acetyl Cysteine NAC Supplement for Lung Health & Immune Support Liver Support & Antioxidants* - with Freeform N-Acetyl-L-Cysteine - 30 Capsules
- Price
- $17.54
- Rating
- 4.7/5
- Reviews
- 3,870
- Age
- 3y ago

NOW Supplements NAC (N-Acetyl Cysteine) 600 mg with Selenium 100 Capsules
- Price
- $12.00
- Rating
- 4.6/5
- Reviews
- 20,966
- Age
- 22y ago

Nutricost N-Acetyl L-Cysteine (NAC) 600mg 120 Vegetarian Capsules
- Price
- $12.98
- Rating
- 4.6/5
- Reviews
- 14,257
- Age
- 8y ago

Designs for Health NAC - 900mg N-Acetyl-L-Cysteine Antioxidant Glutathione Precursor - Detox + Workout Recovery Support - Non-GMO + Gluten Free Supplement (120 Capsules)
- Price
- $47.11
- Rating
- 4.6/5
- Reviews
- 709
- Age
- 24y ago
Newest
by launch date
Micro Ingredients NAC Supplement 600mg Per Serving with NAD+ & Coconut Oil 300 Softgels | 2-in-1 N Acetyl L Cysteine Plus Nicotinamide Forms | NAD Supplements for Women & Men | Non-GMO Gluten Free
- Price
- $24.91
- Rating
- 4.5/5
- Reviews
- 239
- Age
- 11mo 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

Now Foods Supplements NAC (N-Acetyl-Cysteine) 1 000 mg Free Radical Protection* 60 Tablets
- Price
- $10.92
- Rating
- 4.6/5
- Reviews
- 14,857
- Age
- 3y ago

NAC Supplement (N-Acetyl Cysteine) - 99%+ Purity Tested - (1 000mg Per Serving 500mg Per Cap 210 Capsules) (Third Party Tested) with Odor Masking Technology to Boost Glutathione Levels by Double Wood
- Price
- $19.64
- Rating
- 4.6/5
- Reviews
- 1,443
- Age
- 3y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 57% of clicks. Leaders hold, but buyers still shop past them.
Brands
17 rising
Sellers
59
Est. top-5 brand share
80%
Top 20: 100%
Est. top-5 click share
57%
Top 20: 94%
Open market
14%
- NOW Foods25%
- Nutricost22%
- Pure Encapsulations15%
- Life Extension11%
- THORNE6%
- BulkSupplements6%
- Open — no brand owns it (11 brands, 14%)
Demand
Nac search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.4×
Search terms
Top Nac search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- nac supplement1.8M/yr
- nac1.6M/yr
- nac supplement n-acetyl cysteine337K/yr
- nac 600 mg120K/yr
- n acetyl cysteine101K/yr
- n-acetylcysteine70K/yr
- thorne nac60K/yr
- augmented nac32K/yr
- n acetyl cysteine 600 mg43K/yr
- now nac39K/yr
Reviews and returns
What reviews say buyers love and hate about Nac
We read the reviews and the return reasons for every product selling here.
“Strong chemical 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.
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 Nac 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









