Best Vitamin K Supplements UK 2026: Solgar K2 (MK-7) & BetterYou K2 Oral Spray
Published on Monday, 26 January 2026
For most UK buyers the answer is a K2 (MK-7) capsule at 50-100 mcg daily: Solgar Vitamin K2 100mcg is the standard pick, BetterYou's oral spray (180 mcg K2VITAL MK-7 per 3 sprays) suits anyone who cannot swallow capsules, and Viridian's 50 mcg vegan capsule covers lower-dose maintenance. If you take warfarin or another vitamin K antagonist, do not start any of them without speaking to your GP or anticoagulant clinic first — vitamin K directly opposes how those drugs work. Vitamin K is a fat-soluble nutrient important for blood clotting, bone health and the activation of several proteins involved in calcium regulation. In the UK market for 2026, consumer demand has focused on Vitamin K2 as MK-7 because of its longer circulation time and better tissue distribution compared with K1. Shoppers prefer certified, third-party tested products, clear dosage information, and formats that fit modern lifestyles such as sprays, liquid drops and easy-to-swallow capsules. Sustainability and transparent sourcing matter for UK buyers, so vegan or fermentation-derived K2 (MenaQ7, K2VITAL and other menaquinone sources) and ethically packaged options have grown in popularity. Combined formulations, especially vitamin D plus K2, remain a common choice because of the complementary roles those nutrients play in bone and cardiovascular health. This page compares five Vitamin K options on the UK market for 2026 and explains what to look for when choosing one.
Top Picks Summary
What the Research Says About Vitamin K
Scientific evidence supports Vitamin K's role in blood clotting and in helping activate proteins that bind calcium for healthy bones and blood vessels. Most recent research has focused on K2, particularly MK-7, which is absorbed well and stays active longer in the body. Clinical trials and observational studies suggest benefits for bone health markers and possible links to reduced arterial calcification, although results vary by study design and population. As with any supplement, benefits depend on dose, form, baseline nutrient status and individual health factors.
Physiological role: Vitamin K is required to activate proteins like prothrombin for normal blood clotting and osteocalcin for bone mineralization.
MK-7 advantage: MK-7 has a longer half-life than K1 and some short-chain K2 forms, allowing for stable blood levels with lower daily doses.
Bone health evidence: Randomized and observational studies have shown improved markers of bone metabolism and some reductions in fracture risk in certain groups, especially post-menopausal women.
Cardiovascular findings: Higher dietary or supplemental K2 has been associated in cohort studies with lower rates of arterial calcification, but causation is not firmly established and more trials are needed.
Safety and interactions: Vitamin K is generally safe at typical supplement doses, but it can interact with blood-thinning medications such as warfarin. Always consult a clinician before starting supplements if you take anticoagulants.
Quality matters: Look for products with clear dosing, third-party testing, and scientific backing for the specific K2 form used (for example, MenaQ7 is a well-studied MK-7 ingredient).
Frequently Asked Questions
Can I take vitamin K if I'm on warfarin?
Not without medical advice. Vitamin K is the direct antidote to warfarin and other vitamin K antagonists (acenocoumarol, phenindione) — a K supplement can lower your INR and reduce the drug's effect, so it must not be started, stopped or changed on your own. BetterYou labels its K2 spray "Not to be taken if on anti-coagulants (blood thinners) unless advised by GP", and the same caution applies to every product on this page. Speak to your GP or anticoagulant clinic first. This does not apply to DOACs such as apixaban or rivaroxaban, which don't work through vitamin K, but check with your prescriber anyway. Vitamin K supplements are not a treatment for any disease.
K1 or K2 — which should I buy, and how much?
K1 (phylloquinone) is the form in leafy greens and is mainly used for blood clotting; most UK supplements sold for bone and cardiovascular support are K2 (menaquinone), usually MK-7. MK-7 has a much longer half-life than K1 or MK-4, so a once-daily 50-100 mcg dose holds steadier blood levels. Typical UK products sit in that range: Viridian 50 mcg, Solgar 100 mcg, BetterYou 180 mcg per 3-spray serving. The NHS notes adults need roughly 1 mcg per kg of body weight per day and that most people get enough from diet alone, so a supplement is a top-up rather than a necessity.
Which Vitamin K2 supplement suits pill-avoiders better, BetterYou spray?
BetterYou Vitamin K2 Daily Oral Spray is a good fit for people who dislike swallowing tablets or capsules, because it’s an oral spray that delivers vitamin K2 (MK-7) via transbuccal/mucosal absorption. It’s rated 4.4.
How much MK-7 does Solgar Vitamin K2 100mcg provide?
Solgar Vitamin K2 100mcg provides 100 mcg of MK-7 per capsule for daily support. It’s rated 4.7 and is sold in packs of 50 or 100 vegetable capsules.
Conclusion
Vitamin K supplements are a focused choice for UK consumers in 2026, with K2 (MK-7) products leading in popularity for convenience and bioavailability. We hope this guide helped you find a suitable option. If you want to refine results by dosage, vegan status, delivery format or user reviews, use the search or filters to narrow or expand your options. If you are on medication or managing a health condition, check with your healthcare professional before starting any new supplement.