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Vitamins & minerals · FROM DR. PURSER’S TEACHING

Vitamin K1 (Phylloquinone)

Supports proteins involved in blood clotting and bone metabolism.

Based on teaching by Dan Purser, MD. How we prepare these guides

Updated Sep 23, 2026 · Educational reference

THE TEACHING CONNECTION

Supports proteins involved in blood clotting and bone metabolism.

What it does

Supports proteins involved in blood clotting and bone metabolism.

Possible deficiency symptoms

Deficiency can cause abnormal bleeding; it needs clinical evaluation.

How supplementation is approached

Vitamin K1 is part of the vitamin K and clotting discussion, with green vegetables and existing multivitamins relevant to intake. Review why a separate product is being considered and distinguish it from K2 forms.

Food sources

Leafy greens; broccoli; Brussels sprouts.

Supplement forms

Phylloquinone, also called phytonadione.

What to track and reassess

Coordinate any vitamin K change with the anticoagulation team when taking warfarin. Consistent intake and the prescribed monitoring plan matter more than a genotype-based supplement guess.

From starting support to follow-up

If you and your clinician start a CMA replenishment plan, you may add one new product at a time, often waiting 3–7 days to see how you feel. A check-in is usually planned near ten weeks during an approximately 100-day period. Follow your written plan for amounts and timing. At follow-up, you may continue, change, or stop each item. This timetable does not automatically end longer-term support.

Names you may see

Vitamin K1 (Phylloquinone) · Phylloquinone