Introduction

Vitamin K1, also known as phylloquinone, is an essential fat-soluble vitamin primarily responsible for normal blood clotting. It also contributes to bone health and overall metabolic balance.

What Is Vitamin K1?

Vitamin K1 (phylloquinone) is the plant-based form of Vitamin K. It is the most common dietary source of Vitamin K and is found mainly in green leafy vegetables.

• Scientific name: Phylloquinone
• Type: Fat-soluble vitamin
• Main role: Blood coagulation

How Vitamin K1 Works in the Body

Vitamin K1 is required for the synthesis of clotting factors in the liver. Without adequate Vitamin K1, the blood cannot clot properly.

• Activates clotting proteins (Factors II, VII, IX, X)
• Prevents excessive bleeding
• Supports bone metabolism
• Helps maintain vascular health

Sources of Vitamin K1

• Spinach
• Kale
• Broccoli
• Cabbage
• Swiss chard
• Green peas
• Vegetable oils (soybean, canola)

Vitamin K1 Deficiency

Vitamin K1 deficiency is uncommon in healthy adults but may occur in individuals with malabsorption or long-term antibiotic use.

Symptoms may include:

• Easy bruising
• Prolonged bleeding
• Bleeding gums or nosebleeds
• Blood in urine or stool

Dosage & How to Take Vitamin K1

• Adult men: 120 mcg/day
• Adult women: 90 mcg/day
• Pregnancy: As advised by healthcare provider

Vitamin K1 is best absorbed when taken with meals containing fat.

Vitamin K1 vs Vitamin K2

• Vitamin K1: Primarily supports blood clotting
• Vitamin K2: More involved in bone and cardiovascular health

Safety, Side Effects & Precautions

• Generally safe at dietary levels
• May interact with blood-thinning medications (e.g., warfarin)
• Avoid sudden changes in intake if on anticoagulants
• Supplement only under medical supervision if needed

Special Populations

• Newborns: Require Vitamin K at birth to prevent bleeding
• Elderly: Important for clotting and bone support
• People on anticoagulants: Intake should be consistent
• Malabsorption disorders: May require supplementation

Frequently Asked Questions

What does Vitamin K1 do in the body?

Vitamin K1 helps the blood clot properly and prevents excessive bleeding.

Is Vitamin K1 good for bones?

Yes. While its primary role is clotting, it also contributes to bone health.

Can Vitamin K1 be taken daily?

Yes. Daily intake through diet is safe and recommended.

Can Vitamin K1 interact with medications?

Yes. It can interact with blood thinners, so medical guidance is essential.

Best time to take Vitamin K1?

Vitamin K1 should be taken with a fat-containing meal for best absorption.