Nac
Worth a lookShows a $13.0M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size
Incredible$13.0M$13.0M/yr · 4.5M searches
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Incredible13.1%search→purchase rate — share of searches ending in a sale
Avg price
Great$22.11avg listing price — sweet spot $15–$100
Price range
Great$10.25–$53.64cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Okay57%top-5 click share — leaders hold, buyers still browse
Brand share
Okay80%top-5 brand share — brands hold most of the demand
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Review moat
Bad5,643.85avg incumbent reviews — the moat a new listing must climb
Growth
Bad-16.8%90-day search growth — must beat 0% to launch
Is nac profitable on Amazon?
According to Flapen's Amazon United States niche tracking, nac is a $13.0M/yr Amazon United States market (4.5M searches/yr). The top 5 brands hold 80% of demand. Verdict: Worth a look — 61/100.
Data updated Jul 25, 2026 · scored weekly · How we score niches
nac market size & sales
Units sold, revenue, conversion and listing quality across the tracked shelf.- Units sold / yr
- 600K–800K
- avg 25,000–30,000/product
- Revenue / yr
- $13.3M–$17.7M
- units × avg price
- Conversion rate
- 13.1%
- Avg BSR
- #141
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 81%
- Out of stock
- 1.1%
- Avg brand age
- 55 months
- Avg seller age
- 157 days
Competition: brands, sellers & click share
The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.Brands
17 rising
Sellers
59
Top-5 brand share
80%
Top 20: 100%
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%)
nac demand & seasonality
Weekly Amazon search volume, last 104 weeks — -16.8% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.4×
Top nac search terms shoppers use
The exact queries shoppers type, with 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
Top nac products & what they sell for
Every tracked product — its share of the shelf, its review moat, and what it sells for.Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Nutricost N-Acetyl L-Cysteine (NAC) 600mg 180 Capsules
Nutricost$15.754.6★14,257 rev
NOW Supplements NAC (N-Acetyl Cysteine) 600 mg with Selenium 250 Veg Capsules
NOW Foods$20.694.6★20,966 rev
Life Extension N-Acetyl-L-Cysteine (NAC) Immune Respiratory Liver Health NAC 600 mg Potent antioxidant Support Free-radicals Easy to Absorb 60 Capsules
Life Extension$10.254.6★7,821 rev
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
Pure Encapsulations$36.604.7★3,870 rev
NOW Supplements NAC (N-Acetyl Cysteine) 600 mg with Selenium 100 Capsules
NOW Foods$12.004.6★20,966 rev
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
Micro Ingredients$24.91239 rev
NaturaLife Labs N-Acetyl-L-Cysteine (NAC) 1600 mg 100 Capsules - Vegan Non-GMO & Gluten-Free
NaturaLife Labs$15.68754 rev
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
BulkSupplements$20.651,055 rev
Now Foods Supplements NAC (N-Acetyl-Cysteine) 1 000 mg Free Radical Protection* 60 Tablets
NOW Foods$10.9214,857 rev
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
Double Wood Supplements$19.641,443 rev
Trending
90-day click momentumMicro 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
Micro Ingredients$24.914.5★
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
Pure Encapsulations$17.544.7★
NOW Supplements NAC (N-Acetyl Cysteine) 600 mg with Selenium 100 Capsules
NOW Foods$12.004.6★
Nutricost N-Acetyl L-Cysteine (NAC) 600mg 120 Vegetarian Capsules
Nutricost$12.984.6★
Designs for Health NAC - 900mg N-Acetyl-L-Cysteine Antioxidant Glutathione Precursor - Detox + Workout Recovery Support - Non-GMO + Gluten Free Supplement (120 Capsules)
Designs for Health$47.114.6★
What reviews say buyers love and hate about nac
What buyers praise and complain about, mined from review topics.What buyers love
“EXCELLENT PRODUCT”
“Fair price”
“Good Supplement”
“Works very well”
“As advertised”
“my 11 year-old has no problem swallowing it”
“Best Supplement”
“Easy to take, right dosage”
“Memory helps”
“No side effects”
What buyers complain about
“Strong chemical smell”
“Awful after taste”
“Make me feel sick”
“This product is ineffective”
“had to lower my regular dose”
“stomach upset”
“They are tiny”
“Bad quality control”
“Good product however a bit pricey”
“Within a few hours of taking just 1 pill my heart was beating fast”
Top return reasons
Common nac questions
- Is nac profitable to sell on Amazon United States?
- The niche generates $13.0M/yr across 26 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -16.8%. Flapen's verdict: Worth a look (61/100).
- How competitive is the nac niche?
- 17 brands and 59 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 80% of demand.
- What do buyers complain about in nac?
- Top complaints mined from reviews: Smell, Taste-Overall, Side Effects. The return rate is 0.0%.
- When does demand for nac peak?
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- What does it cost to enter the nac niche?
- Listings span $10.25–$53.64; the average listing price is $22.11 (sweet spot $15–$100). The average incumbent carries 5,644 reviews — the moat a new listing must climb.