Vitamin D deficiency: The sign of low levels to spot on your head – ‘earliest symptom’

But based on your age, sun exposure, skin tone and diet, you should be able to determine your risk of a deficiency.

According to the NHS, people at the highest risk of a deficiency include those who are rarely outdoors or wear clothes that cover up most of their skin.

The health body adds: “If you have dark skin – for example, you have an African, African Caribbean or south Asian background – you may also not make enough vitamin D from sunlight.

“You should consider taking a daily supplement containing 10 micrograms of vitamin D throughout the year.”