Key Points Using the data provided for the GrassrootsHealth study from almost 3,000 participants with supplemental magnesium and vitamin K2 information, we plotted every participant’s supplemental vitamin D intake (dose) and blood level (response) The vitamin D dose-response was compared between participants who reported taking no supplemental magnesium or vitamin K2, those who reported usually … Continue reading Are both supplemental magnesium and vitamin K2 combined important for vitamin D levels?