Vitamin D: Why So Many of Us Run Low

Vitamin D is made in the skin in sunlight, yet a large share of people in sunny countries run low. We spend the hottest hours indoors, cover up outdoors and use sunscreen, all for good reasons.

What it does

It helps the body use calcium for strong bones and teeth, and it supports the muscles and the immune system.

Who should check it

• Anyone who is often tired or has aching bones or muscles.
• People who spend most of the day indoors.
• Pregnant women, older adults and people with darker skin.

A simple blood test shows your level. Your doctor or our pharmacist can then suggest a daily dose that suits you.

How to take it

With a meal that contains some fat, since vitamin D dissolves in fat. Take it at the same time each day and keep to the dose on the label unless your doctor advises otherwise.