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We Tested 6 Vitamin K in the UK — See Which One Is Best

We analysed 6 vitamin k products, scoring each on effectiveness, ingredient quality, value for money, side effects, and certifications. Here are the top-rated picks for 2026, ranked by overall score.

Last updated: 04 April 2026 · Reviewed by Bart, Health & Tech Enthusiast

Quick Picks

🥇
Best Overall
NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules
85.0 £21.99
🥈
Best Value
Vitamin K2 MK-7, 100 mcg, 240 Capsules
76.0 £14.71
🥉
Runner Up
Vitamin K2 + D3, 120 Capsules
80.0 £12.99
#1
NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules
NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules

NOW Foods

NOW Foods MK-7 Vitamin K-2 100mcg is a well-regarded standalone K2 supplement using the branded MenaQ7® menaquinone-7 form, which reviewers consistent...

Adults supplementing vitamin D3 at any dose People taking calcium supplements seeking proper bone deposition Vegans and vegetarians needing a plant-based K2 source
85.0
Score
93.0 Certifications
£21.99
Amazon UK
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#2
MK-7 Vitamin K-2, 100 mcg, 120 Veg Capsules
MK-7 Vitamin K-2, 100 mcg, 120 Veg Capsules

NOW Foods

The MenaQ7® form sets this apart from budget K2 alternatives. It is a patented, clinically studied MK-7 derived from natto and processed soy-free, wit...

Anyone supplementing vitamin D3 at doses above 2000 IU daily who wants to manage calcium distribution Adults over 40 focused on long-term bone density and arterial health People who need a soy-free K2 source
83.0
Score
92.0 Side Effects
£24.23
iHerb
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#3
Vitamin K2 + D3, 120 Capsules
Vitamin K2 + D3, 120 Capsules

Futurebiotics

5,000 IU of cholecalciferol paired with 90 mcg of K2 as MK-7 — this is the combination that actually makes sense. MK-7 is the long-acting form of K2 w...

People with confirmed vitamin D deficiency needing a therapeutic dose to correct low levels Those supplementing D3 at higher doses who need K2 to prevent calcium misrouting Anyone living in low-sunlight climates who takes D3 through autumn and winter
80.0
Score
88.0 Side Effects
£12.99
iHerb
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#4
Vitamin K2 + D3, Extra Strength, 120 Capsules
Vitamin K2 + D3, Extra Strength, 120 Capsules

Futurebiotics

At 10,000 IU of cholecalciferol paired with 120 mcg of MK-7 menaquinone, this is a therapeutic-strength formula built for correcting deficiency rather...

Adults with blood-confirmed vitamin D deficiency who haven't responded to 5,000 IU doses People in northern climates or desk-bound lifestyles with minimal sun exposure Anyone seeking a combined bone and calcium metabolism formula without paying for a premium brand
77.0
Score
91.0 Side Effects
£14.72
iHerb
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#5
Vitamin K2 MK-7, 100 mcg, 240 Capsules
Vitamin K2 MK-7, 100 mcg, 240 Capsules

Nutricost

At 100 mcg of MK-7 per softgel across 240 capsules, this is consistently cited as one of the best-value K2 options available — nearly every reviewer f...

Anyone already taking vitamin D3 who needs K2 to ensure calcium is deposited in bones rather than soft tissue Budget-conscious buyers wanting a long-lasting single-ingredient K2 supplement People who struggle with large capsules — the softgels are notably small
76.0
Score
92.0 Value For Money
£14.71
iHerb
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#6
Vitamins D and K with Sea-Iodine, 60 Capsules
Vitamins D and K with Sea-Iodine, 60 Capsules

Life Extension

5,000 IU of D3 paired with 2,100 mcg of vitamin K — including MK-7, confirmed by reviewers — is a genuinely well-thought-out combination: MK-7 directs...

People with confirmed vitamin D deficiency who also want calcium-routing K2 support in one capsule Those with low sun exposure — referenced by multiple reviewers as the core reason for purchase Post-partum women — several reviewers specifically mentioned using it after pregnancy and breastfeeding to address multiple deficiencies
73.0
Score
82.0 Ingredient Quality
£14.36
iHerb
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How We Rank Vitamin K

We analyse user reviews from Amazon UK and other public sources, cross-references ingredient labels and dosage information, checks for third-party testing certifications, and evaluates value for money. Each product is scored 0–100 across evidence-based categories: effectiveness, ingredient quality, value for money, side effects profile, certifications, and an overall weighted score.

Rankings are updated regularly as new reviews and pricing data become available. Products must pass our quality gate (minimum review count and data coverage) to appear on this page.

Frequently Asked Questions

What is the best vitamin k in 2026? ▼
NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules is our top-rated vitamin k with a score of 85.0/100. NOW Foods MK-7 Vitamin K-2 100mcg is a well-regarded standalone K2 supplement using the branded MenaQ7® menaquinone-7 form, which reviewers consistently praise for its superior bioavailability and lon...
How are vitamin k ranked on AIScored? ▼
Our methodology analyses user reviews, ingredient science, effectiveness evidence, third-party testing, and value for money. Each product is scored 0-100 across evidence-based categories, and the overall score determines the ranking. We update rankings regularly as new data becomes available.
Is NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules worth the price? ▼
NOW Foods MK-7 Vitamin K-2 100mcg - 60 Veg Capsules scores 79.0/100 for value for money. This represents reasonable value, though there may be cheaper alternatives with similar results. Read full review →
View all Vitamin K products →

Disclaimer: AIScored provides data-driven rankings based on publicly available reviews and product information. This is not medical advice. Always consult a healthcare professional before starting any supplement. Affiliate links may earn us a commission at no extra cost to you.