The main form is vitamin K1 (phylloquinone), which is found mainly in green leafy vegetables. For better absorbability, it is ideal to sprinkle it with, for example, olive oil. Another form is vitamin K2 (menaquinone), which is mainly of bacterial origin. It can be found in small amounts in various types of animal and fermented food. However, it is also produced by intestinal bacteria (microbiome).
Its main function is to help with normal blood clotting and maintaining healthy bones. If you want to be sure that you have enough of this vitamin, you can take it from the diet or in form of nutritional supplements. The recommended daily intake of this vitamin is between 60–80 μg.
If you want to find out more information about other vitamins, their classification, functions, recommended doses and signs of deficiency and excessive intake, you should check out our article The Complete Guide to Vitamins: What They’re For, How to Know When You’re Deficient and How Much to Take?