Who Might Be at Higher Risk?
Certain seniors face greater caution with vitamin K supplements:
- Those prescribed blood thinners (warfarin or similar vitamin K antagonists)
- Individuals with a history of blood clots, atrial fibrillation, or recent stroke
- People taking multiple medications that affect clotting or liver function
- Older adults with variable diets who might combine supplements with sudden increases in green vegetables
Research from sources like the Linus Pauling Institute and clinical reviews highlights that while vitamin K itself doesn’t typically “cause” excessive clotting in healthy people, the interaction with medications can tip the scales. High-dose vitamin E, by contrast, sometimes shows the opposite effect (more bleeding risk), showing how different vitamins influence coagulation differently.
