How much vitamin D you need
On this the NHS says: “Children from the age of 1 year and adults need 10 micrograms of vitamin D a day. This includes pregnant and breastfeeding women, and people at risk of vitamin D deficiency.
“Babies up to the age of 1 year need 8.5 to 10 micrograms of vitamin D a day. A microgram is 1,000 times smaller than a milligram (mg).
“The word microgram is sometimes written with the Greek symbol μ followed by the letter g (μg). Sometimes the amount of vitamin D is expressed as International Units (IU). 1 microgram of vitamin D is equal to 40 IU. So 10 micrograms of vitamin D is equal to 400 IU.”
As a result, the average adults needs around 100 micrograms, 4,000IU of vitamin D per day, but it is not wise to get all from supplementation.