Vitamin K

Vitamin K is a group of essential fat-soluble vitamins that play a critical role in blood coagulation, bone metabolism, and cardiovascular health. It primarily exists in two natural forms: Vitamin K1 (phylloquinone), which is synthesized by plants and found in green leafy vegetables, and Vitamin K2 (menaquinones), which is produced by bacteria and found in fermented foods like natto, certain cheeses, and animal products. Vitamin K2 is further categorized into subtypes, with MK-4 and MK-7 being the most common in supplements.