Vitamin K1 (Phylloquinone)
The vitamin your body needs to make blood-clotting proteins — without it, a paper cut could bleed way longer than it should.
Benefits
- +Essential for proper blood clotting (produces clotting factors II, VII, IX, X)
- +Supports healthy bone metabolism
- +May help maintain bone density
- +Deficiency is rare but can cause bleeding disorders
- +Important for overall cardiovascular health
Dosage & Cost
K1 is primarily for blood clotting. If you're interested in bone health specifically, Vitamin K2 (menaquinone) is more relevant. If you're on warfarin, DO NOT supplement without your doctor's guidance.
Side Effects
- !Can interfere with blood-thinning medications like warfarin — important interaction
- !Excessive amounts can promote blood clotting (risk of thrombosis)
- !Generally very safe at normal dietary levels
- !May cause digestive upset in high doses
Food Sources
- • Green leafy vegetables (spinach, kale, broccoli, Brussels sprouts)
- • Soybeans
- • Avocados
- • Fermented foods
References & Links
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This page is for informational purposes only. The information here has not been evaluated by the Food and Drug Administration (FDA). No supplement discussed on this page is intended to diagnose, treat, cure, or prevent any disease. Please consult your doctor or a qualified healthcare professional before taking any dietary supplement.