Vitamin K2 MK-7

Vitamin K is essential for normal blood clotting and for maintaining strong, healthy bones. It helps the body use calcium properly by activating proteins that bind calcium to bone tissue, while also preventing unwanted calcium build-up in blood vessels and soft tissues.

There are two main forms: vitamin K1 (phylloquinone) and vitamin K2 (menaquinone). K1 is found mostly in green leafy vegetables and primarily supports normal blood clotting. K2 is made by gut bacteria and found in foods such as natto, cheese and eggs. It plays a key role in bone and cardiovascular health by directing calcium into bones and away from arteries. Supplements often use K2 because it stays active in the body longer and reaches bone and vascular tissue more effectively than K1.

MK-7 is a subtype of vitamin K2 that has superior bioavailability and a much longer half-life in the body than MK-4 or K1. This means you only need small daily doses to maintain steady levels. MK-7 is now the most widely used and researched form for supporting bone and heart health.

Yes, it does. The trans form of MK-7 is the natural, biologically active configuration that your body can use effectively. Some low-quality supplements contain a mix of cis and trans isomers, but only the trans form is fully active. A high-quality product will state “100 % all-trans MK-7,” confirming its purity and potency.

Both work equally well, but the source differs. Vegan vitamin K2 (MK-7) is produced by the natural fermentation of non-animal ingredients such as chickpeas or lichen. Non-vegan vitamin K2 is often extracted from animal-based fermentation media or fish oil derivatives. If you follow a plant-based diet, always check the label for a certified vegan source such as “K2 (MK-7) from natto fermentation.”

Yes — in fact, they complement each other. Vitamin D helps you absorb calcium, and vitamin K directs that calcium into bones and teeth rather than soft tissues. This combination is often recommended for people taking vitamin D regularly, as it helps maintain balanced calcium metabolism.

For most people, yes. Vitamin K is fat-soluble but non-toxic at normal supplemental doses. However, if you take anticoagulant medication, you should consult your doctor before using any vitamin K supplement, as it can interfere with the medicine’s action.

Vitamin K is fat-soluble, so take it with a meal that contains some healthy fat to improve absorption. Many people take it with vitamin D with their main meal for best results.

Vitamin K1 is found in green leafy vegetables such as kale, spinach, broccoli and cabbage. Vitamin K2 occurs in fermented foods like natto, certain cheeses, and egg yolks. A varied diet with both types helps support healthy bones, blood and circulation.

The best vitamin K supplements use natural, all-trans vitamin K2 (MK-7) derived from fermented sources such as chickpea or natto. It’s well absorbed, stays in the body longer, and works synergistically with vitamin D3 to optimise calcium use for strong bones and flexible arteries. Look for products made to GMP standards and tested for stability and purity. VitaBright vitamin K supplements meet all these criteria, offering proven and effective nutritional support for bone health, blood clotting, arteries and cardiovascular health.

VitaBright supplements are produced in state-of-the-art, BRC accredited grade AA, UK manufacturing facilities. We manufacture to GMP standards - the same as pharmaceutical medicines - which means our process involves batch testing, rigorous record-keeping, and inspections by the Medicines and Healthcare products Regulatory Agency (MHRA). We use only the finest ingredients sourced from leading global suppliers, double seal all bottles, and have ingredients independently tested for heavy metals to further guarantee our supplement quality or safety.