Overview

• The BfR advises against taking very large vitamin D bolus doses, citing studies that link such regimens to higher risks of falls and bone fractures.
• The agency notes dosing errors are more likely with products meant for infrequent intake, as people may take them far more often than intended.
• Data on combining high-dose vitamin D with vitamin K2 are scarce, so the BfR recommends using such combinations only on a doctor’s advice.
• Leading medical societies say healthy adults generally do not need routine supplementation or blood tests in winter, underscoring that more is not better.
• Consumer guidance recommends a self-use cap of 20 micrograms per day and highlights supplementation mainly for risk groups, including many care home residents.