Vitamin K2 MK-4

Vitamin K2 MK-4 (menaquinone-4) is a synthetic or naturally occurring form of Vitamin K2, containing four isoprene units. It is found in animal-based foods (such as liver, egg yolks, butter) and can also be biosynthesized from Vitamin K1 in the body. Compared to MK-7, MK-4 has a shorter half-life in the body, meaning it requires more frequent dosing.