---
title: "Vitamin K — £454K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/health-personal-care/vitamin-k"
last_updated: "2026-07-31T21:09:46.799Z"
locale: en
meta:
description: "Niche score 46/100 · £454K/yr market · 407K searches/yr · £9.23 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 46/100 · £454K/yr market · 407K searches/yr · £9.23 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Vitamin K — £454K/yr Amazon UK Niche (2026) - Flapen"
---
# **vitamin k**
**Skip it**
Prices mostly outside the sweet spot ($1.93–$15.74) — this niche doesn't clear our bar today.
Market size 58Growth 10Conversion 95Competition 27Returns 100Price range 5Avg price 27Brand share 57Review moat 42Quality gap 27
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****12.1%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Good****£454K**
£454K/yr · 407K searches
**Brand share**
**Good****71%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Okay****2,261.12**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Okay****69%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Okay****£9.23**
avg listing price — sweet spot $15–$100
**Growth**
**Bad****-29.7%**
90-day search growth — must beat 0% to launch
**Price range**
**Bad****£1.93–£15.74**
cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, vitamin k is a £454K/yr Amazon United Kingdom market (407K searches/yr). The top 5 brands hold 71% of demand. Demand peaks in Aug–Sep. Verdict: Skip it — 46/100.
Data updated Jul 25, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **vitamin k market data**
- **Units sold / yr**
- **40K–50K**
- avg 1,500–2,000/product
- **Revenue / yr**
- **£369K–£462K**
- units × avg price
- **Conversion rate**
- **12.1%**
- **Avg BSR**
- **#185**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **76%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **50 months**
- **Avg seller age**
- **173 days**
## **Competition & brand share**
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**16 **▼falling
**Sellers**
**17**
**Top-5 brand share**
**71%**
Top 20: 100%
**Top-5 click share**
**69%**
Top 20: 100%
**Open market**
**25%**
- WeightWorld25% - Nutrition Geeks17% - EVO NUTRITION14% - Carlyle9% - ALPHA016% - Horbäach5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -29.7% search growth over the last 90 days.
60K40KSpike '24Spike '25Black Friday '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Aug, Sep · busiest ÷ quietest = 5.1×
[**Open Trend **](https://flapen.com/research/uk/health-personal-care/vitamin-k/trend)
## **Top vitamin k search terms**
- **vitamin k2**139K/yr-32.1%10.3% conv. - **k2 vitamin supplements**63K/yr-35.1%12.1% conv. - **vitamin k**51K/yr-19.4%7.5% conv. - **vitamin k2 mk7**31K/yr-37.1%11.1% conv. - **k2 mk7**22K/yr-24.6%11.1% conv. - **vitamin k2 high strength**13K/yr-10.9%9.1% conv. - **vit k2**11K/yr-19.7%10.1% conv. - **k2 vitamin**10K/yr-72.3%8.1% conv. - **vit k**4K/yr-11.3%8.3% conv. - **vit k2 mk7**4K/yr-12.5%12.5% conv. [**All search terms **](https://flapen.com/research/uk/health-personal-care/vitamin-k/search-terms)
## **Top vitamin k 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%10%£45K20%£91K30%£136K40%£182K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 17 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Vitamin K2 MK7 200mcg - 1 Year Supply - 365 Vegan Tablets - 1 a Day**WeightWorld**£12.02**4.7★3,410 rev](https://www.amazon.co.uk/dp/B0B6Q6PN1M) [2**Vitamin D3 4000 iu & Vitamin K2 MK7 100g - 1 Year Supply 365 Easy-Swallow Vitamin D3 K2 Tablets 1-A-Day High Strength Vegetarian D3 and K2 Vitamin Supplements UK Made Vitamin D Tablets**Nutrition Geeks**£7.95**4.6★17,521 rev](https://www.amazon.co.uk/dp/B0CR57HRDV) [3**EVO NUTRITION Vitamin K2 MK-7 200mcg | 365 Vegetarian and Vegan Tablets (not Capsules) | 1-A-Day | Supports Maintenance of Normal Bones | One Years Supply of High Strength Vitamin K2 Menaquinone MK7**EVO NUTRITION**£11.50**4.6★3,226 rev](https://www.amazon.co.uk/dp/B07XQHS14F) [4**Vitamin K2 MK7 200mcg | High Strength | 180 Vegan Tablets | Menaquinone-MK7 | Suitable for Vegetarians and Vegans | By Carlyle**Carlyle**£5.86**4.6★514 rev](https://www.amazon.co.uk/dp/B0CD8BHGQ5) [5**Vitamin K2 MK7 200ug | 365 High Strength Tablets | Menaquinone MK-7 | Suitable for Vegetarians and Vegans | by Horbaach**Horbäach**£8.26**4.5★1,135 rev](https://www.amazon.co.uk/dp/B091B2KGFJ)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Pure Nutrition Vitamin K Complex K1 + K2 | 2250 mcg | 120 Tab | Full Spectrum K Vitamin Supplement with K1 1000mcg K2 as MK4 1000mcg + K2 as MK7 250 mcg | Non GMO | Gluten Free**PURE NUTRITION NATURAL TREASURES**£10.31**31 rev1y ago](https://www.amazon.co.uk/dp/B0DGLBT19N) [**Vitamin D3 4000 iu & Vitamin K2 MK7 100g - 1 Year Supply 365 Easy-Swallow Vitamin D3 K2 Tablets 1-A-Day High Strength Vegetarian D3 and K2 Vitamin Supplements UK Made Vitamin D Tablets**Nutrition Geeks**£7.95**17,521 rev2y ago](https://www.amazon.co.uk/dp/B0CR57HRDV) [**Vitamin K2 MK7 200mcg | High Strength | 180 Vegan Tablets | Menaquinone-MK7 | Suitable for Vegetarians and Vegans | By Carlyle**Carlyle**£5.86**514 rev2y ago](https://www.amazon.co.uk/dp/B0CD8BHGQ5) [**Bulk Vitamin K2 Tablets 75ug 90 Tablets**Bulk**£1.93**114 rev3y ago](https://www.amazon.co.uk/dp/B0BGLWKFZH) [**Vitamin K2 MK7 200mcg - 1 Year Supply - 365 Vegan Tablets - 1 a Day**WeightWorld**£12.02**3,410 rev4y ago](https://www.amazon.co.uk/dp/B0B6Q6PN1M)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**ECO-VITS Vitamin K2 MK7 500MCG 30 Capsules Derived from Natto Recyclable Packaging Sealed Pouch Suitable for Vegetarians**ECO-VITS**£5.30**4.4★**▲ 292%**](https://www.amazon.co.uk/dp/B08GL23Z9P) [**Pure Nutrition Vitamin K Complex K1 + K2 | 2250 mcg | 120 Tab | Full Spectrum K Vitamin Supplement with K1 1000mcg K2 as MK4 1000mcg + K2 as MK7 250 mcg | Non GMO | Gluten Free**PURE NUTRITION NATURAL TREASURES**£10.31**4.6★**▲ 115%**](https://www.amazon.co.uk/dp/B0DGLBT19N) [**Vitamin K2 MK-7 100mcg 120 Vegan Capsules Fermented Natto Based Vitamin K Resealable and Recyclable Pouch by Alpha01**ALPHA01**£5.87**4.7★**▲ 61%**](https://www.amazon.co.uk/dp/B096BCQZR7) [**Vitamin K2 MK7 200mcg - 1 Year Supply - 365 Vegan Tablets - 1 a Day**WeightWorld**£12.02**4.7★**▲ 27%**](https://www.amazon.co.uk/dp/B0B6Q6PN1M) [**Vitamin K2 MK-7 600mcg - 120 Vegan Capsules - Fermented Natto Based Vegan Vitamin K - Supports Bone Health Resealable and Recyclable Pouch by Alpha01**ALPHA01**£7.27**4.7★**▲ 17%**](https://www.amazon.co.uk/dp/B096BCVB17)
**~~View all trending →~~**
## **What buyers say about vitamin k**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**19%
*“Good quality and easy to swallow”*
**Value For Money**17%
*“Good price”*
**Vitamin**16%
*“Healthy vitamin”*
**Ease Of Chewing/Swallowing**11%
*“Easy to swallow”*
**Advertised Vs Actual Product**5%
*“As advertised”*
**Ease Of Use**4%
*“Easy to use”*
**Side Effects**3%
*“dont leave any aftertaste”*
**Dosage**2%
*“Just the right dosage”*
**Efficiency**2%
*“effective”*
**Calcium**1%
*“I use them alongside my calcium/vitD to encourage the calcium to go directly to my bones”*
### **What buyers complain about **
**Dosage**13%
*“it looks as if the dosage is very high”*
**Size-Overall**9%
*“First of all the cap doesnt fit the bottle”*
**Vitamin**9%
*“Not the right type of Vitamin D for me I guess”*
**Functionality-Overall**5%
*“Not working”*
**Advertised Vs Actual Product**5%
*“Other brands are misleading”*
**Value For Money**5%
*“Cheap for a reason”*
**Nutritional Content**4%
*“Other products in the Nutrition Geeks line are a scam”*
**Side Effects**4%
*“they made me ill”*
**Quality-Overall**3%
*“Not for me seem cheap n cheerful”*
**Strength**3%
*“Either too strong or poorly formulated”*
### **Top return reasons **
**Vitamin**100%
## **Common questions**
- **Is vitamin k profitable to sell on Amazon United Kingdom?**
- The niche generates £454K/yr across 17 tracked products. 90-day search growth is -29.7%. Flapen's verdict: Skip it (46/100).
- **How competitive is the vitamin k niche?**
- 16 brands and 17 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 71% of demand.
- **What do buyers complain about in vitamin k?**
- Top complaints mined from reviews: Dosage, Size-Overall, Vitamin. The return rate is 0.1%.
- **When does demand for vitamin k peak?**
- Demand peaks in Aug–Sep; the busiest month runs 5.1× the quietest.
- **What does it cost to enter the vitamin k niche?**
- Listings span £1.93–£15.74; the average listing price is £9.23 (sweet spot $15–$100). The average incumbent carries 2,261 reviews — the moat a new listing must climb.
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