---
title: "Nac — $1.1M/mo Amazon US Product Research (2026)"
canonical_url: "https://flapen.com/research/us/health-household/nac"
last_updated: "2026-08-12T07:51:20.545Z"
locale: en
meta:
description: "Amazon product research for nac: $1.1M/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for nac: $1.1M/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Nac — $1.1M/mo Amazon US Product Research (2026)"
---
# **Nac**
**Worth a look**
Shows a $13.0M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 100Growth 17Conversion 96Competition 46Returns 100Price range 86Avg price 93Brand share 42Review moat 24Quality gap 27
**Market size**
**Incredible****$13.0M**
$13.0M/yr · 4.5M searches
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****13.1%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$22.11**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$10.25–$53.64**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Okay****57%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****80%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****5,643.85**
avg 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 ~~](https://flapen.com/research/methodology)
## **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.
120K80KBlack Friday '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/health-household/nac/trend)
## **Top nac search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **nac supplement**1.8M/yr-20.1%12.2% conv. - **nac**1.6M/yr-16.2%10.7% conv. - **nac supplement n-acetyl cysteine**337K/yr-16.4%9.2% conv. - **nac 600 mg**120K/yr-12.6%12.4% conv. - **n acetyl cysteine**101K/yr-13.1%10.8% conv. - **n-acetylcysteine**70K/yr-14.0%11.5% conv. - **thorne nac**60K/yr+3.5%19.4% conv. - **augmented nac**32K/yr+45.5%0.9% conv. - **n acetyl cysteine 600 mg**43K/yr-41.0%9.2% conv. - **now nac**39K/yr-15.2%14.6% conv. [**All search terms **](https://flapen.com/research/us/health-household/nac/search-terms)
## **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.
0%5%$648K10%$1.3M15%$1.9M20%$2.6M1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Nutricost N-Acetyl L-Cysteine (NAC) 600mg 180 Capsules**Nutricost**$15.75**4.6★14,257 rev](https://www.amazon.com/dp/B01CUQFKW4) [2**NOW Supplements NAC (N-Acetyl Cysteine) 600 mg with Selenium 250 Veg Capsules**NOW Foods**$20.69**4.6★20,966 rev](https://www.amazon.com/dp/B0013OUQ3S) [3**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**$10.25**4.6★7,821 rev](https://www.amazon.com/dp/B008ML8D4O) [4**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**$36.60**4.7★3,870 rev](https://www.amazon.com/dp/B00OA6NLG0) [5**NOW Supplements NAC (N-Acetyl Cysteine) 600 mg with Selenium 100 Capsules**NOW Foods**$12.00**4.6★20,966 rev](https://www.amazon.com/dp/B000MGWFWI)
**~~View all top sellers →~~**
### **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**$24.91**239 rev11mo ago](https://www.amazon.com/dp/B0FM9S8NQZ) [**NaturaLife Labs N-Acetyl-L-Cysteine (NAC) 1600 mg 100 Capsules - Vegan Non-GMO & Gluten-Free**NaturaLife Labs**$15.68**754 rev2y ago](https://www.amazon.com/dp/B0CW8QXQD7) [**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**$20.65**1,055 rev3y ago](https://www.amazon.com/dp/B0CCX27QHY) [**Now Foods Supplements NAC (N-Acetyl-Cysteine) 1 000 mg Free Radical Protection* 60 Tablets**NOW Foods**$10.92**14,857 rev3y ago](https://www.amazon.com/dp/B0C63L1VQ6) [**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**$19.64**1,443 rev3y ago](https://www.amazon.com/dp/B0BK731F6T)
**~~View all new products →~~**
### **Trending**
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**Micro Ingredients**$24.91**4.5★**▲ 126%**](https://www.amazon.com/dp/B0FM9S8NQZ) [**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**$17.54**4.7★**▲ 66%**](https://www.amazon.com/dp/B0BGJR2FQY) [**NOW Supplements NAC (N-Acetyl Cysteine) 600 mg with Selenium 100 Capsules**NOW Foods**$12.00**4.6★**▲ 49%**](https://www.amazon.com/dp/B000MGWFWI) [**Nutricost N-Acetyl L-Cysteine (NAC) 600mg 120 Vegetarian Capsules**Nutricost**$12.98**4.6★**▲ 37%**](https://www.amazon.com/dp/B07984ZPVP) [**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**$47.11**4.6★**▲ 34%**](https://www.amazon.com/dp/B0039N54F6)
**~~View all trending →~~**
## **What reviews say buyers love and hate about nac**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**22%
*“EXCELLENT PRODUCT”*
**Value For Money**9%
*“Fair price”*
**Vitamin**6%
*“Good Supplement”*
**Efficiency**4%
*“Works very well”*
**Advertised Vs Actual Product**4%
*“As advertised”*
**Ease Of Chewing/Swallowing**3%
*“my 11 year-old has no problem swallowing it”*
**Nutritional Content**3%
*“Best Supplement”*
**Dosage**2%
*“Easy to take, right dosage”*
**Focus Enhancement**2%
*“Memory helps”*
**Side Effects**2%
*“No side effects”*
### **What buyers complain about **
**Smell**26%
*“Strong chemical smell”*
**Taste-Overall**9%
*“Awful after taste”*
**Side Effects**5%
*“Make me feel sick”*
**Functionality-Overall**4%
*“This product is ineffective”*
**Dosage**4%
*“had to lower my regular dose”*
**Acid Regulator/Stomach Ache Relief**3%
*“stomach upset”*
**Size-Overall**3%
*“They are tiny”*
**Quality-Overall**3%
*“Bad quality control”*
**Value For Money**3%
*“Good product however a bit pricey”*
**Heart Health**2%
*“Within a few hours of taking just 1 pill my heart was beating fast”*
### **Top return reasons **
**Smell**29%
**Advertised Vs Actual Product**17%
**Functionality-Overall**11%
**Dosage**7%
**Acid Regulator/Stomach Ache Relief**6%
**Value For Money**4%
**Ingredients-Overall**4%
**Size-Overall**3%
**Vitamin**3%
**Ease Of Chewing/Swallowing**3%
## **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.
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