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Vitamin K2

prices mostly outside the sweet spot ($1.93–$15.74) — Vitamin K2 doesn't clear our bar today.

Flapen Score

46
Skip it
Market size 58Growth 10Conversion 95Competition 27Returns 100Price range 5Avg price 27Brand share 57Review moat 42Quality gap 27
This niche Category average

Is Vitamin K2 profitable on Amazon?

According to Flapen's Amazon United Kingdom niche tracking, Vitamin K2 is a £467K/yr Amazon United Kingdom market (421K searches/yr). The top 5 brands hold 71% of demand. Demand peaks in Feb–Mar. Verdict: Skip it — 46/100.

Vitamin K2: the Amazon niche in one read

Everything a seller checks before entering, in three answers.

Is the demand real?

Not really. Search demand moved -30.1% over the last 90 days and 12.0% of searches end in a purchase.

£467K

revenue / yr

Units sold / yr50K
Search volume / yr-30.1%421K
Conversion rate12.0%
Avg price£9.23

Who owns the niche?

The top 5 brands hold 71% of demand, so 29% of the market is open.

29%

open market share

Brands · sellers16 · 17
Top-5 product click share69%
Open market29%
Avg brand age50 months

Is there a way in?

Listing quality. The average product page scores 0/100 on content standards. Incumbents average 4.6★ — the gap to enter on.

0/100

page quality · 17 products

Sponsored placement76%
New entrants (1y)0· 0 succeeded
Avg rating4.6★
Avg reviews2,261

Top Vitamin K2 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 take 69% of clicks — established leaders, but buyers still shop beyond them.

£0£47K£93K£140K£187K1101001K10K100K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

16 falling

Sellers

17

Top-5 brand share

71%

Top 20: 100%

Top-5 click share

69%

Top 20: 100%

Open market

24%

  • WeightWorld24%
  • Nutrition Geeks17%
  • EVO NUTRITION14%
  • Carlyle9%
  • ALPHA017%
  • Horbäach5%

Vitamin K2 demand & seasonality

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

Volume421KCVR12.0%Products17Brands16Top 5 Brands71%OOS Rate0.0%Rating4.6★Reviews2,261Avg BSR#185
40K30KSpike '24Spike '25Black Friday '25SepDecMarJunAugNovMarMay

Peak months: Feb, Mar · busiest ÷ quietest = 3.9×

Top Vitamin K2 search terms shoppers use

The exact queries shoppers type, with 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
  • vitamin k2 mk-74K/yr
  • k2 vitamin10K/yr
  • vit k4K/yr

What reviews say buyers love and hate about Vitamin K2

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

What buyers love

82% of reviews
Quality-Overall19%

Good quality and easy to swallow

Value For Money17%

Good price

Vitamin16%

Healthy vitamin

Ease Of Chewing/Swallowing11%

Easy to swallow

Advertised Vs Actual Product5%

As advertised

What buyers complain about

60% of reviews
Dosage13%

it looks as if the dosage is very high

Size-Overall10%

First of all the cap doesnt fit the bottle

Vitamin9%

Not the right type of Vitamin D for me I guess

Functionality-Overall5%

Not working

Value For Money5%

Cheap for a reason

Vitamin K2 return rate & reasons

Why buyers send it back, as a share of all return requests.

0.1%

Return rate

0%

Fixable by listing

The "fixable" share counts expectation-mismatch reasons — size, look, advertised-vs-actual — that better copy and images address.

1Vitamin
100%

Common Vitamin K2 questions

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

Flapen scores Vitamin K2 46/100 on Amazon United Kingdom — Skip it. The niche generates £467K/yr across 17 tracked products. Search demand moved -30.1% over the last 90 days.
Search demand for Vitamin K2 on Amazon United Kingdom peaks in Feb–Mar, where the busiest month runs 3.9× the quietest.