There are two main forms of vitamin K:

Vitamin K1 (phylloquinone): found in plant foods like leafy greens
Vitamin K2 (menaquinone): found in animal foods and fermented foods (2Trusted Source)
Vitamin K2 can be further divided into several different subtypes. The most important ones are MK-4 and MK-7.
later, we will read about how this vitamin works