---
title: "Nac Supplement — £760K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/health-personal-care/nac-supplement"
last_updated: "2026-07-31T19:36:32.431Z"
locale: en
meta:
description: "Niche score 52/100 · £760K/yr market · 440K searches/yr. A concentrated shelf (top 5 take 81% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 52/100 · £760K/yr market · 440K searches/yr. A concentrated shelf (top 5 take 81% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Nac Supplement — £760K/yr Amazon UK Niche (2026) - Flapen"
---
# **nac supplement**
**Worth a look**
Shows low returns (0.0%), but a concentrated shelf (top 5 take 81% of clicks) keeps it on the watch list.
Market size 71Growth 17Conversion 95Competition 16Returns 100Price range 68Avg price 63Brand share 40Review moat 49Quality gap 43
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****12.8%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Good****£760K**
£760K/yr · 440K searches
**Price range**
**Good****£6.97–£32.00**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Good****£13.53**
avg listing price — sweet spot $15–$100
**Review moat**
**Okay****1,606.7**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Okay****81%**
top-5 brand share — brands hold most of the demand
**Growth**
**Bad****-16.5%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****81%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United Kingdom niche tracking, nac supplement is a £760K/yr Amazon United Kingdom market (440K searches/yr). The top 5 brands hold 81% of demand. Verdict: Worth a look — 52/100.
Data updated Jul 25, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **nac supplement market data**
- **Units sold / yr**
- **50K–60K**
- avg 3,000–4,000/product
- **Revenue / yr**
- **£677K–£812K**
- units × avg price
- **Conversion rate**
- **12.8%**
- **Avg BSR**
- **#8**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **80%**
- **Out of stock**
- **1.7%**
- **Avg brand age**
- **47 months**
- **Avg seller age**
- **167 days**
## **Competition & brand share**
The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**10 **▼falling
**Sellers**
**26**
**Top-5 brand share**
**81%**
Top 20: 100%
**Top-5 click share**
**81%**
Top 20: 100%
**Open market**
**14%**
- NEW LEAF PRODUCTS40% - PH PROWISE Healthcare17% - WeightWorld9% - Solgar8% - Multivita7% - VitaBright5% - Open — no brand owns it (4 brands, 14%)
## **Demand & seasonality**
Weekly Amazon search volume, last 102 weeks — -16.5% search growth over the last 90 days.
10K6KBlack Friday '24Spike '25Black Friday '25Holiday '25Spike '26 seasonDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.5×
[**Open Trend **](https://flapen.com/research/uk/health-personal-care/nac-supplement/trend)
## **Top nac supplement search terms**
- **nac supplement**185K/yr-18.9%11.0% conv. - **nac**158K/yr-12.1%10.0% conv. - **augmented nac**11K/yr+99.0%1.1% conv. - **nac n-acetyl-cysteine 600mg**18K/yr-53.2%11.2% conv. - **nac 600mg**10K/yr-29.5%12.7% conv. - **n acetyl cysteine**13K/yr-12.3%10.4% conv. - **n-acetylcysteine**10K/yr-21.7%11.2% conv. - **n-acetyl-cysteine nutritional supplements**8K/yr-24.3%6.2% conv. - **l cysteine**3K/yr+52.5%2.6% conv. - **n-acetyl cysteine**6K/yr-35.0%13.3% conv. [**All search terms **](https://flapen.com/research/uk/health-personal-care/nac-supplement/search-terms)
## **Top nac supplement 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.
0%15%£114K30%£228K45%£342K60%£456K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 10 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**NAC N-Acetyl-Cysteine 600mg Capsules N-Acetyl Cysteine Nutritional Supplements 180 NAC Capsules - Nac Supplement High Bioavailability Amino Acid - Vegan Friendly - Made in UK by New Leaf**NEW LEAF PRODUCTS**£7.73**4.5★526 rev](https://www.amazon.co.uk/dp/B0DSLD7PN7) [2**NAC N-Acetyl-Cysteine 600mg | 150 Capsules | Vegan N-Acetyl-Cysteine Nutritional Supplements| 5 Months Supply* | Better Bioavailable & Letter Box Friendly | UK Manufactured by Prowise Healthcare**PH PROWISE Healthcare**£7.73**4.5★3,663 rev](https://www.amazon.co.uk/dp/B06XVHGC79) [3**NAC N-Acetyl-Cysteine 600mg - 180 Capsules (6 Months Supply) - 1 per Day - Vegan & GMP-Certified NAC Supplement - Precursor to Glutathione - N-Acetyl-Cysteine Nutritional Supplements - Made in Europe**WeightWorld**£13.87**4.5★3,083 rev](https://www.amazon.co.uk/dp/B091FT9L27) [4**Solgar NAC (N-Acetyl-L-Cysteine) 600 Mg Vegetable Capsules - Pack of 60 - Healthy Skin Hair and Nails - Vegan**Solgar**£15.16**4.6★825 rev](https://www.amazon.co.uk/dp/B0001VUOJ0) [5**NAC Supplement 1200mg Daily Serving 120 Vegan Capsules 2-Month Supply High Strength N-Acetyl-Cysteine for Daily Use UK Made Non-GMO Gluten-Free Dairy-Free High Bioavailability Formula**Multivita**£6.97**4.3★147 rev](https://www.amazon.co.uk/dp/B08P51X4VZ)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**NAC N-Acetyl-Cysteine 600mg Capsules N-Acetyl Cysteine Nutritional Supplements 180 NAC Capsules - Nac Supplement High Bioavailability Amino Acid - Vegan Friendly - Made in UK by New Leaf**NEW LEAF PRODUCTS**£7.73**526 rev1y ago](https://www.amazon.co.uk/dp/B0DSLD7PN7) [**Toniiq 1300mg NAC - 2 Month Supply - Min. 98%+ Tested Purity - Ultra High Strength Bioavailable NAC Cysteine Supplement - 120 Vegetarian N Acetyl Cysteine Capsules -Lab Tested TQ**Toniiq**£14.70**1,247 rev1y ago](https://www.amazon.co.uk/dp/B0D2J928MP) [**VitaBright NAC Supplement | 600mg | 180 Capsules | Acetylcysteine Nutritional Supplements | Swallow or Twist Open Capsules of Powder | Pure Clean NAC N-Acetyl-Cysteine Supplement**VitaBright**£12.01**648 rev2y ago](https://www.amazon.co.uk/dp/B0CQ5JZXL3) [**NAC N-Acetyl-Cysteine 600mg - 180 Capsules (6 Months Supply) - 1 per Day - Vegan & GMP-Certified NAC Supplement - Precursor to Glutathione - N-Acetyl-Cysteine Nutritional Supplements - Made in Europe**WeightWorld**£13.87**3,083 rev5y ago](https://www.amazon.co.uk/dp/B091FT9L27) [**NAC Supplement 1200mg Daily Serving 120 Vegan Capsules 2-Month Supply High Strength N-Acetyl-Cysteine for Daily Use UK Made Non-GMO Gluten-Free Dairy-Free High Bioavailability Formula**Multivita**£6.97**147 rev5y ago](https://www.amazon.co.uk/dp/B08P51X4VZ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**NAC N-Acetyl-Cysteine 600mg Capsules N-Acetyl Cysteine Nutritional Supplements 180 NAC Capsules - Nac Supplement High Bioavailability Amino Acid - Vegan Friendly - Made in UK by New Leaf**NEW LEAF PRODUCTS**£7.73**4.5★**▲ 35%**](https://www.amazon.co.uk/dp/B0DSLD7PN7) [**Pure Encapsulations NAC 600mg - Pure N-Acetyl-L-Cysteine for Glutathione Synthesis Support - 90 Capsules**Pure Encapsulations**£32.00**4.5★**▲ 14%**](https://www.amazon.co.uk/dp/B07ND5HPXF) [**Solgar NAC (N-Acetyl-L-Cysteine) 600 Mg Vegetable Capsules - Pack of 60 - Healthy Skin Hair and Nails - Vegan**Solgar**£15.16**4.6★**— 8%**](https://www.amazon.co.uk/dp/B0001VUOJ0) [**Toniiq 1300mg NAC - 2 Month Supply - Min. 98%+ Tested Purity - Ultra High Strength Bioavailable NAC Cysteine Supplement - 120 Vegetarian N Acetyl Cysteine Capsules -Lab Tested TQ**Toniiq**£14.70**4.6★**— 5%**](https://www.amazon.co.uk/dp/B0D2J928MP) [**N-Acetyl Cysteine (NAC) 600 mg 120 Capsules - UK Manufactured and Suitable for Vegans & Vegetarians**swiss bioenergetics**£11.92**4.5★**— 9%**](https://www.amazon.co.uk/dp/B07FDD16K5)
**~~View all trending →~~**
## **What buyers say about nac supplement**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**22%
*“Good product; Arrived in very good condition, happy about quality and price, thank you Amazon”*
**Value For Money**10%
*“worth the money”*
**Breathability**7%
*“Breath better”*
**Vitamin**7%
*“Great quality supplement”*
**Dosage**4%
*“with a straightforward 600mg serving”*
**Inflammation**4%
*“Game changer for endometriosis”*
**Efficiency**4%
*“Effective”*
**Energy Level**3%
*“energy”*
**Advertised Vs Actual Product**3%
*“it is better than I expected”*
**Acid Regulator/Stomach Ache Relief**3%
*“Cleared my chest congestion”*
### **What buyers complain about **
**Smell**22%
*“Smells like plastic”*
**Dosage**6%
*“that would be a huge 2400mg dose”*
**Quality-Overall**5%
*“Poor quality”*
**Ingredients-Overall**5%
*“has some additives”*
**Heart Health**4%
*“seem to be getting heart burn”*
**Taste-Overall**4%
*“it smells and tastes like farts”*
**Allergies**4%
*“Intolerance”*
**Acid Regulator/Stomach Ache Relief**4%
*“Gave me bad stomach ache”*
**Skin Health**3%
*“Not noticed a difference with my skin yet”*
**Stress/Anxiety**3%
*“Made me terribly anxious and depressed”*
## **Common questions**
- **Is nac supplement profitable to sell on Amazon United Kingdom?**
- The niche generates £760K/yr across 10 tracked products. 90-day search growth is -16.5%. Flapen's verdict: Worth a look (52/100).
- **How competitive is the nac supplement niche?**
- 10 brands and 26 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 81% of demand.
- **What do buyers complain about in nac supplement?**
- Top complaints mined from reviews: Smell, Dosage, Quality-Overall. The return rate is 0.0%.
- **When does demand for nac supplement peak?**
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- **What does it cost to enter the nac supplement niche?**
- Listings span £6.97–£32.00; the average listing price is £13.53 (sweet spot $15–$100). The average incumbent carries 1,607 reviews — the moat a new listing must climb.
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