Frequently Asked Questions
What is Vitamin K?
Vitamin K is one of the four fat-soluble vitamins (alongside A, D and E), best known for its role in blood clotting - it's what helps wounds heal properly. There's also good evidence it's needed to help keep bones healthy. It's found in green leafy vegetables such as broccoli and spinach, vegetable oils and cereal grains, with small amounts in meat and dairy.
What is Vitamin K good for?
Two things above all: vitamin K contributes to normal blood clotting, and to the maintenance of normal bones. The bone benefit is the reason it features in our Osteo4 formula alongside calcium, vitamin D and magnesium, and why our D3 + K2 combination tablet has become such a popular choice for those thinking seriously about long-term bone health.
What's the difference between Vitamin K1 and K2?
Vitamin K1 (phylloquinone) is the form found in green leafy vegetables and is mainly associated with blood clotting. Vitamin K2 is the form most associated with bone health, and within K2, MK-7 is the most bioavailable variety. Our Vitamin K2 100mcg uses naturally sourced, more than 96% pure MK-7 in a 100% all-trans formula, protected by a light-shielding capsule.
Why take Vitamin K with Vitamin D?
They're natural partners in bone health. Vitamin D helps your body absorb calcium and maintain normal blood calcium levels, while vitamin K contributes to the maintenance of normal bones - so taking them together supports the full journey. That's the thinking behind our Super Strength D3 4000iu + K2 100mcg one-a-day combo, and behind Osteo4, which adds calcium and magnesium to the pair.
Is Vitamin K just for blood clotting?
That's the old view - vitamin K was long thought of as simply 'the clotting vitamin', but it's increasingly recognised for its ability to help keep our bones strong too, and it has been catching the attention of researchers for good reason. Vitamin K contributes to the maintenance of normal bones as well as normal blood clotting, making it a quietly versatile nutrient many of us overlook.
How much Vitamin K do I need?
Vitamin K works optimally at sensible levels - around 150 micrograms a day is a commonly recommended amount, and it's important not to take too much. Our Vitamin K2 100mcg provides a well-judged daily dose of the premium MK-7 form in a single tablet, and because vitamin K is fat-soluble, it's best taken with a meal.
Which foods contain Vitamin K?
Green leafy vegetables are the stars - broccoli and spinach in particular - along with vegetable oils and cereal grains, with small amounts in meat and dairy foods. If greens don't feature on your plate as often as they should, a daily vitamin K supplement is a simple way to support your intake alongside a balanced diet.
Why is MK-7 considered the best form of Vitamin K2?
MK-7 is the most bioavailable form of vitamin K2 - it's absorbed well and stays active in the body longer than other forms, so a modest daily dose works efficiently. Ours is naturally sourced at more than 96% purity, in a 100% all-trans formula with no cis-isomers (the less active molecular form), and protected by a light-shielding capsule shell to preserve its quality.
Why shop for Vitamin K supplements at Just Vitamins?
Quality of form is everything with vitamin K, and ours is clearly labelled at every step: our Vitamin K2 provides 100mcg of naturally sourced, 96%+ pure MK-7 the most bioavailable form in a 100% all-trans formula with a light-shielding capsule to preserve quality. For bone health routines, we offer smart combinations too: D3 4000iu + K2 100mcg in a single tablet, and Osteo4 with 100% NRV of calcium, vitamin D, K and magnesium. Everything is honestly labelled with exact strengths, so comparison is simple.