Vitamin K

Vitamin K is a fat-soluble vitamin that plays essential roles in the body including regulating blood clotting blood, supporting bone health and preventing cardiovascular diseases such as important. Vitamin K deficiency can lead to bleeding disorders increased bone fragility and certain chronic diseases road.

Types of Vitamin K

Vitamin K occurs naturally in two main forms:

Vitamin K₁ (Phylloquinone): Found primarily in green leafy green vegetables and is the main form of vitamin K obtained through diet.

Vitamin K₂ (Menaquinone): Synthesized by animal foods fermented products and intestinal bacteria. Vitamin K₂ remains more long duration active in the body and has more pronounced effects on bone and vascular health.

In addition these row, synthetic synthetic form known as Vitamin K₃ (Menadione) exists but its use as a dietary supplement is not recommended due to risk of toxicity.

Functions of Vitamin K in the Body

1) Role in Blood Clotting

Vitamin K enables the synthesis of clotting factors such as prothrombin (Factor II) Factor VII Factor IX and Factor X. Without these proteins the body cannot stop bleeding and bleeding disorders may occur.

Newborn infants are at high risk of vitamin K deficiency bleeding so vitamin K injection is administered after birth.

2) Effect on Bone Health

Vitamin K activates osteocalcin a bone-specific protein that regulates calcium binding to bones and increases bone density. Vitamin K₂ plays a particularly important role in reducing osteoporosis risk in elderly individuals.

3) Effect on Cardiovascular Health

Vitamin K₂ activates a protein called matrix Gla protein (MGP) which prevents calcification in blood vessel walls thereby reducing the risk of arterial stiffness (atherosclerosis) and heart diseases.

Sources of Vitamin K

Vitamin K can be obtained naturally through foods.

Foods rich in vitamin K₁

• Leafy green vegetables such as spinach cabbage broccoli lettuce and chard
• Green tea
• Plant oils (soybean canola)

Foods rich in vitamin K₂

• Fermented foods (natto yogurt cheese)
• Liver egg yolk
• Fatty fish
• The gut microbiota can also produce vitamin K₂ but the amount produced may not fully meet the body’s needs.

Vitamin K Deficiency

Although vitamin K deficiency is rare it can occur under certain conditions:

• Long-term antibiotic use (which kills intestinal bacteria)
• Fat malabsorption disorders (Crohn disease celiac disease pancreatic insufficiency)
• Liver diseases (since vitamin K is activated in the liver)
• Long-term low vitamin K diets

Symptoms

• Easily bruised skin
• Prolonged bleeding
• Nosebleeds and gum bleeding
• Increased bone fragility

Vitamin K deficiency in newborns can cause severe bleeding disorders which is why vitamin K supplementation is administered after birth.

Vitamin K Excess and Drug Interactions

Consuming excessive vitamin K through food is generally harmful. However it can interact with certain medications:

Anticoagulant drugs (Warfarin): Vitamin K can increase blood clotting and thus reduce the effectiveness of anticoagulants like warfarin. Therefore individuals taking these medications should maintain a consistent intake of vitamin K in their diet.

Antibiotics: Long-term antibiotic use can disrupt the gut microbiota and reduce vitamin K₂ production.

Daily Vitamin K Requirement

Daily recommended vitamin K intake varies by age and sex. For infants 0 to 6 months it is 2 mcg per day for children 1 to 3 age it is 30 mcg per day for children 9 to 13 years it is 60 mcg per day for men over 19 years it is 120 mcg per day and for women over 19 years it is 90 mcg per day.

Vitamin K is an essential vitamin with vital functions including blood clotting bone health and prevention of arterial stiffness. Vitamin K₁ is obtained from plant sources while vitamin K₂ comes from animal and fermented foods. Deficiency can lead to bleeding disorders and osteoporosis. Adequate intake through a healthy diet is important. Individuals taking anticoagulant medications should maintain consistent vitamin K intake under doctor supervision.