Can You "Overdose" On Vitamin D?

In 2012, the European Food Safety Authority (EFSA) published its scientific opinion on the tolerable upper level for Vitamin D for adults, including pregnant and lactating women.
This upper limit is 100 µg per day.
For children and adolescents, the UL has been set at 50 µg per day for ages 1-10, and at 100 µg per day for ages 11-17.
For infants up to one year of age, the UL is 25 µg per day.