Can consuming too much vitamin D be harmful?

True cases of vitamin D toxicity are exceptional and generally occur at blood concentrations above 375 nmol/L. This threshold corresponds to a daily intake of approximately 50,000 IU for several months. When this toxicity is reached, it can cause severe hypercalcemia, leading to nausea, vomiting, weight loss, polyuria (increased urine production), and kidney failure.

What is the safe dose?

The researchers behind the study believe that supplementation between 400 and 4,000 IU per day is safe for the majority of the population. Risks would only arise in cases of prolonged, massive intake, as illustrated by an extreme case in the United Kingdom, where a man reportedly consumed up to 150,000 IU daily , in combination with other supplements.