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Much as I don't like, or wear helmets I really don't think wearing one is harmful physically
I do believe that
Fever is the body's response to viral or bacterial infection, and increases antibody defence. So paracetamol, while reducing the symptoms of a temperature, doesn't help in defending against viral attack. Better to live with a higher temperature
Vitamin D helps optimise your immunity.
Hmmm
So these suggestions are harmful?
BTW I appreciate your bluntness