Vitamin D helps to regulate the amount of calcium and phosphate in the body, according to the NHS.
We need the ‘sunshine’ vitamin to prevent bone deformities, as well as aches and pains.
Most people get all of the vitamin D they need from sunlight during the summer and spring. But, you could be at risk of a deficiency during autumn and spring, when daylight hours dwindle.
These are the warning signs to look out for that you need to boost your vitamin D intake.
“Lack of vitamin D has been linked to muscle weakness, fatigue, and even [poor] mental health,” said Holland and Barrett.
“Studies have shown that vitamin D deficiency can contribute to an impaired immune system, making it more difficult to fight infections.
“Vitamin D receptors in our brains help brain cells receive and understand chemical signals- a lack of Vitamin D is likely to affect the way our brain communicates.”
Having a low mood could be a sign of vitamin D deficiency, as the vitamin stimulates the production of serotonin, that “happy hormone”.
A lack of vitamin D could also lead to unexplained obesity, or being overweight.
Having achy bones and joints – especially in the knees and back – is a sign of a deficiency. People that don’t get enough of the vitamin can develop rickets – a condition that affects bone development.
One of the most common symptoms of a vitamin D deficiency is having a sweaty scalp.
Speak to a GP if you’re worried about vitamin D deficiency symptoms.
You can boost your vitamin D intake by taking daily supplements.
The Department of Health suggests taking daily 10mg supplements during the autumn and winter to boost your vitamin D levels.
Alternatively, simple dietary changes could reduce symptoms.
Try eating more oily fish, red meat, egg yolks and fortified foods, the NHS said.