For example, people who have pneumonia tend to have lower vitamin C levels, and vitamin C supplements have been shown to shorten the recovery time.
Pneumonia has been identified as an at-risk factor for developing serious complications from the coronavirus.
Which foods contain vitamin C?
Vitamin C is naturally found in oranges, orange juice, broccoli, tomatoes, strawberries and red/green peppers.
According to Holland and Barrett, broccoli is particularly beneficial for the immune system because it also packed with vitamins A.