What it does
Supports proteins involved in blood clotting and bone metabolism.
Possible deficiency symptoms
Deficiency can cause abnormal bleeding; it needs clinical evaluation.
Food sources
Leafy greens; broccoli; Brussels sprouts.
Supplement forms
Phylloquinone, also called phytonadione.
Before taking a supplement
If taking warfarin, discuss vitamin K intake and keep it consistent rather than suddenly eliminating greens.
Questions for your visit
Could my diet, medicines, absorption or another condition explain my concern? What evidence would support treatment, and how would we check whether it helps?
Names you may see
Vitamin K1 (Phylloquinone) · Phylloquinone
Sources & perspective
This is an editorial adaptation of the Purser Wellness nutrient reference app. Purser teaching connections are labeled separately from clinical interpretation. Private cases and individual treatment protocols are not reproduced.
Use the public resources below for additional context.
NIH Office of Dietary Supplements: Vitamin K1 (Phylloquinone)
