The NHS warns: “Do not take more than 100 micrograms (4,000 IU) of vitamin D a day as it could be harmful.
“This applies to adults, including pregnant and breastfeeding women and the elderly, and children aged 11 to 17 years.”
It adds: “Children aged 1 to 10 years should not have more than 50 micrograms (2,000 IU) a day. Infants under 12 months should not have more than 25 micrograms (1,000 IU) a day.”
Nonetheless, it says if your doctor has recommended you take a different amount of vitamin D, you should follow their advice.