From around late March or early April until the end of September, most people can get all the vitamin D they need through sunlight on their skin and from eating a balanced diet.

However, during the autumn and winter, you need to get vitamin D from your diet because the sun is not strong enough for your body to make vitamin D.

Because it's difficult for people to get enough vitamin D from food alone, everyone (including pregnant and breastfeeding women) should consider taking a daily supplement containing 10 micrograms of vitamin D during the autumn and winter.

Some groups of the population are at greater risk of not getting enough vitamin D and are advised to take a supplement every day of the year.

It is recommended that:

Breastfed babies should be given a daily supplement containing 8.5 to 10 micrograms of vitamin D from birth, even if the mother is taking a supplement containing vitamin D herself

Babies having 500mls (about a pint) or more of formula a day should not be given a vitamin D supplement, because infant formula is fortified with vitamin D and other nutrients

All children aged 1 to 4 years old should be given a daily supplement containing 10 micrograms of vitamin D

People who are not often exposed to the sun – such as people who are frail or housebound, are in an institution such as a care home, or usually wear clothes that cover most of their skin when outdoors should take a daily supplement containing 10 micrograms of vitamin D.

Sources - https://www.nhs.uk/common-health-questions/food-and-diet/do-i-need-vitamin-supplements/#:~:text=Most%20people%20do%20not%20need,small%20amounts%20to%20work%20properly.

Photo credit -

https://www.ndtv.com/health/vitamin-d-deficiency-heres-how-you-can-maintain-vitamin-d-levels-at-home-2250731/amp/1