Overview

• Dr Jo Ward advises that vitamin D should be taken with vitamin K2 to help direct calcium appropriately and reduce the chance of calcium depositing in arteries.
• She notes that roughly 60% of UK residents use vitamin D from September to May because sunlight is too weak for reliable natural production.
• The doctor cautions that St. John’s wort can cause significant drug interactions, sometimes reducing the effectiveness of the contraceptive pill, and urges those on blood thinners or heart drugs such as digoxin to consult a clinician.
• She recommends separating zinc and magnesium—especially at high doses—since they compete for absorption, taking zinc with food, and considering magnesium at night.
• The reports cite Healthline’s explanation that vitamin K helps manage where calcium is deposited, supporting the vitamin D plus K2 guidance.