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Nac Supplement

Nac Supplement shows low returns (0.0%), but a concentrated shelf (top 5 take 81% of clicks) keeps it on the watch list.

Flapen Score

52
Worth a look
Market size 71Growth 17Conversion 95Competition 16Returns 100Price range 68Avg price 63Brand share 40Review moat 49Quality gap 43
This niche Category average

Is Nac Supplement profitable on Amazon?

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.

Nac Supplement: the Amazon niche in one read

Everything a seller checks before entering, in three answers.

Is the demand real?

Worth a look. Search demand moved -16.5% over the last 90 days and 12.8% of searches end in a purchase.

£760K

revenue / yr

Units sold / yr60K
Search volume / yr-16.5%440K
Conversion rate12.8%
Avg price£13.53

Who owns the niche?

The top 5 brands hold 81% of demand, so 19% of the market is open.

19%

open market share

Brands · sellers10 · 26
Top-5 product click share81%
Open market19%
Avg brand age47 months

Is there a way in?

Listing quality. The average product page scores 0/100 on content standards. Incumbents average 4.5★ — the gap to enter on.

0/100

page quality · 10 products

Sponsored placement80%
New entrants (1y)0· 0 succeeded
Avg rating4.5★
Avg reviews1,607

Top Nac Supplement products & what they sell for

Every tracked product — its share of the shelf, its review moat, and what it sells for.

Competition: brands, sellers & click share

The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.

£0£114K£228K£342K£456K1001K10K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

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%)

Nac Supplement demand & seasonality

Weekly search volume, with the niche's key stats alongside.

Volume440KCVR12.8%Products10Brands10Top 5 Brands81%OOS Rate1.7%Rating4.5★Reviews1,607Avg BSR#8
10K6KBlack Friday '24Spike '25Black Friday '25Holiday '25Spike '26DecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.5×

Top Nac Supplement search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

  • nac supplement185K/yr
  • nac158K/yr
  • augmented nac11K/yr
  • nac n-acetyl-cysteine 600mg18K/yr
  • nac 600mg10K/yr
  • n acetyl cysteine13K/yr
  • n-acetylcysteine10K/yr
  • n-acetyl-cysteine nutritional supplements8K/yr
  • l cysteine3K/yr
  • n-acetyl cysteine6K/yr

What reviews say buyers love and hate about Nac Supplement

What buyers mention most, as a share of all reviews.

What buyers love

68% of reviews
Quality-Overall22%

Good product; Arrived in very good condition, happy about quality and price, thank you Amazon

Value For Money10%

worth the money

Breathability7%

Breath better

Vitamin7%

Great quality supplement

Dosage4%

with a straightforward 600mg serving

What buyers complain about

61% of reviews
Smell22%

Smells like plastic

Dosage6%

that would be a huge 2400mg dose

Quality-Overall5%

Poor quality

Ingredients-Overall5%

has some additives

Heart Health4%

seem to be getting heart burn

Common Nac Supplement questions

The questions sellers ask about this niche, answered from the tracked metrics.

Flapen scores Nac Supplement 52/100 on Amazon United Kingdom — Worth a look. The niche generates £760K/yr across 10 tracked products. Search demand moved -16.5% over the last 90 days.
Search demand for Nac Supplement on Amazon United Kingdom is steady year-round — the busiest month runs 1.5× the quietest.