What was the catch in the super vitamins, me being a guru

And was that if you aren’t sick medication only would make you sicker at least at the time that medicine was very strong, like this allergy your immune system is weak and you haven’t a disease today you have the option to buy everything non-allergic, you can imagine at that time people have allergy to things that was common and in all places, and you can imagine that something like hay make many people be allergic to it, and also that something lethal like tuberculosis, vitamin C could make the person have a much better life and be less susceptible to die, was like miracle “tubercular came out of the bed you aren’t sick”. Rute Bezerra de Menezes Gondim