NOW Foods Vitamina K-2, 100 mcg - 100 cápsulas

What is Vitamin K-2 and why is it important?

Vitamin K-2, also known as menaquinone, is a biologically active form of vitamin K. Unlike vitamin K-1 (phylloquinone), which is found primarily in leafy green vegetables, K-2 is produced by intestinal bacteria and is present in fermented foods such as natto, as well as in animal products such as liver and egg yolk. NOW Foods presents this vitamin in its menaquinone-4 (MK-4) form, one of the most bioavailable and utilized by the body. Vitamin K-2 plays an essential role in calcium regulation: it helps direct this mineral to the bones and teeth, preventing its deposit in soft tissues such as the arteries.

Health benefits of vitamin K-2

Vitamin K-2 contributes to vital bodily functions. According to the European Food Safety Authority (EFSA), vitamin K contributes to normal blood clotting and the maintenance of normal bones. In addition, its role in calcium metabolism supports bone and cardiovascular health. Its highlighted benefits include:

• Bone maintenance: Activates osteocalcin, a protein that fixes calcium in the bone matrix, helping to maintain bone density.
• Normal clotting: Activates liver proteins necessary for clot formation, promoting proper hemostasis.
• Cardiovascular health: Activates MGP (matrix Gla protein), which inhibits arterial calcification, contributing to vascular flexibility.

Vitamin K-2 works in synergy with vitamin D and calcium, enhancing their beneficial effects on the bone and circulatory system.

How much vitamin K-2 do you need? Recommended dosage

The adequate intake of vitamin K in adults is between 70 and 90 mcg per day, depending on gender. Each NOW Foods capsule provides 100 mcg of MK-4, a dose that covers daily needs and offers a margin for those who want additional support for bone or cardiovascular health. It is recommended to take one capsule daily with a meal containing some fat, as vitamin K is fat-soluble and its absorption is improved in the presence of lipids. For best results, it can be combined with a vitamin D and calcium supplement, always under professional supervision.

Differences between vitamin K-1 and K-2

There are two main forms of vitamin K: K-1 (phylloquinone) and K-2 (menaquinone). K-1 is found in leafy green vegetables and is mainly used by the liver to activate clotting factors. K-2, on the other hand, is found in fermented and animal-derived foods, and has a longer half-life in the body. This allows K-2 to be distributed more efficiently to extrahepatic tissues, such as bones and arteries, making it a particularly beneficial form for bone and cardiovascular health. Within vitamin K-2, there are subtypes such as MK-4 (present in this product) and MK-7, which differ in their origin and duration in the body.

How to choose the best vitamin K-2 supplement

When selecting a vitamin K-2 supplement, it is important to consider the form and quality. NOW Foods uses menaquinone-4 (MK-4), a biologically active form backed by studies. This product comes in easy-to-swallow gelatin capsules and offers a precise dose of 100 mcg per capsule. In addition, it is manufactured under strict quality controls, is free of artificial ingredients and suitable for vegetarians. For those who do not consume fermented foods or wish to ensure optimal intake, this supplement represents a reliable and effective option.

Possible side effects and contraindications

Vitamin K-2 is generally safe and well tolerated at recommended doses. No tolerable upper intake levels (UL) have been established due to its low toxicity. However, people taking anticoagulants such as warfarin should consult their doctor before taking vitamin K supplements, as it may interfere with their effect. Pregnant or breastfeeding women should also seek professional advice. This product is a food supplement and should not be used as a substitute for a balanced diet.