When you feel a "flu" coming on, a little bit of zinc sulfate on the tongue does wonders. I've wiped out a flu on more than one occasion. If that isn't enough and your adrenals are gone, or a virus has taken hold take licorice sticks for a couple of weeks until your adrenals recover and the virus has been destroyed, its a really good anti-viral but makes you go to the toilet really hard (remember to intake more potassium as licorice depletes this quicker)