We have used these capsules for several years and haven\'t needed to get a \'flue injection. If you catch your sore throat, runny nose, swollen glands early, these capsules will halt the progress of a virus from full effect. They are amazing, cheap and made here in NZ. They seem to be just the right mix of ingredients. I usually take Liposmal Vit C as well, and that makes a force to be reckoned with.