Can CAM boost immunity and help prevent URTIs?

Studies have examined the impact of zinc, probiotics and vitamin C on upper respiratory tract infections
Teen flu

Harper, aged 16, is generally well but suffers recurrent upper respiratory tract infections and takes lots of time off school.

She appears well, her menses are normal, she does not smoke cigarettes and there is no history of an eating disorder. Harper is finding Year 11 studies stressful.