Vitamin C is a widely used supplement to help boost immunity in the winter months

Doctors have issued a warning to people who take vitamin C supplements, urging people to stop taking or reduce their dosage if they experience unusual symptoms.

Vitamin C is a commonly used supplement and often reached for to try and bat away coughs and colds during the winter months.

It can not only help boost the immune system, but aid with the absorption of iron and works to maintain healthy skin, blood vessels, bones and cartilage.

According to Mayo Clinic, sources of vitamin C include berries, cantaloupe, tomatoes, peppers, potatoes, cabbage, Brussels sprouts, broccoli, spinach and citrus fruits, such as oranges.

Most people get enough vitamin C from their diet, yet people who smoke or are around secondhand smoke; have certain digestive conditions or types of can:cer or have a diet lacking in fruit and vegetables are more likely to be deficient.