Have you had a cold, flu or even pneumonia in the last year? You're not alone - in fact you're among 70% of the UK population.
But a new study claims that three million people could be spared the sniffles if they took vitamin D pills.
That's more than the number of people who are stopped from getting the flu after having the vaccine.
The people behind the new study want vitamin D to be added to food so that everyone gets enough.
