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Vitamin K

Fail

Prices span $1.93–$15.74, mostly outside the sweet spot, so Vitamin K is a Fail.

Flapen Score
46
46 / 100
Ranks 1,173 of 2,035 Health & Personal Care niches · −2 vs the category median of 48
Market size
£454K/yr407K searches / yr
90-day growth
-29.7%search demand this quarter
Competition
69%top-5 click share · 16 brands · 17 sellers

Flapen Score

Vitamin K against its category

The dotted line is the Health & Personal Care average. Past it, Vitamin K is stronger. Inside it, weaker.

46Fail
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

Market

The Vitamin K market on Amazon at a glance

Shoppers on Amazon United Kingdom searched for Vitamin K 407K times last year and spent an estimated £454K. The top 5 brands take 71% of clicks. Demand peaks in Aug–Sep. Flapen scores it 46 out of 100, a Fail.

01 · Demand

An estimated 12.1% of those searches ended in a purchase.

Shoppers searched for this 407K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. An estimated 12.1% of those searches ended in a purchase. Searches in the last 90 days moved -29.7% against the 90 days before. Searches, conversion and average price together put the market at an estimated £454K a year.

Searches, last 12 months
407K
Growth, 90 days vs prior 90
-29.7%
Conversion, latest week
12.1%
Market size, estimated
£454Ka year
Peak month
August5.1× the quietest month
Top search term
vitamin k2139K searches a year

02 · Price

A sale here is worth £9.23.

Listings sell for £9.23 on average, from £1.93 to £15.74. Amazon reports units sold in ranges. This niche sold 40K to 50K a year. The average listing sells 1,500 to 2,000 of them. At £9.23 that is £14K to £18K a year per listing.

Average price
£9.23under the $15 to $100 sweet spot
Price range
£1.93–£15.74
Amazon United Kingdom median price
£12.12across 27,606 niches
Units sold a year
40K–50K
Units per listing a year
1,500–2,000
Revenue per listing a year
£14K–£18K
Returns
0.1%of orders · Amazon United Kingdom median 0.6%

03 · Entry bar

The bar here is reviews.

76% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #185 within Vitamins. It carries 2,261 reviews at 4.59 stars, so a new listing needs social proof before a better product.

Sponsored listings
76%
Prime listings
100%
Out of stock, average day
0.0%
Average rank
#185in Vitamins
Average rating
4.59 starsAmazon United Kingdom average 4.36 stars
Average reviews
2,261per listing
Listings tracked
17

04 · Newcomers

Brands here are settling in.

The brands on the shelf have sold for 50 months on average, so the names here are settling in.

Launched, last 12 months
0
Successful launches
0Amazon's first-year sales bar
Average brand age
50 months

Products

Top Vitamin K 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.

Competition

Competition: brands, sellers & click share

The top 5 products take an estimated 69% of clicks. Leaders hold, but buyers still shop past them.

£0£45K£91K£136K£182K1101001K10K100K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

16 falling

Sellers

17

Est. top-5 brand share

71%

Top 20: 100%

Est. top-5 click share

69%

Top 20: 100%

Open market

25%

  • WeightWorld25%
  • Nutrition Geeks17%
  • EVO NUTRITION14%
  • Carlyle9%
  • ALPHA016%
  • Horbäach5%

Demand

Vitamin K search demand

Weekly searches over the year, seasonality beneath. Pick a range.

60K40KSpike '24Spike '25Black Friday '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Aug, Sep · busiest ÷ quietest = 5.1×

Search terms

Top Vitamin K search terms shoppers use

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

  • vitamin k2139K/yr
  • k2 vitamin supplements63K/yr
  • vitamin k51K/yr
  • vitamin k2 mk731K/yr
  • k2 mk722K/yr
  • vitamin k2 high strength13K/yr
  • vit k211K/yr
  • k2 vitamin10K/yr
  • vit k4K/yr
  • vit k2 mk74K/yr

Reviews and returns

What reviews say buyers love and hate about Vitamin K

We read the reviews and the return reasons for every product selling here.

19%of positive reviews mention “Quality-Overall”
13%of negative reviews mention “Dosage”
0.1%of orders come back
“it looks as if the dosage is very high”
A buyer, on “Dosage”13% of negative reviews mention the same topic

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.

14 topics

NegativePositive

FAQ

Common Vitamin K 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