As I recall, it is more of a 'supplement' than a preventative when taken internally. It is not a 'cure'.
As Americans who are sold everything, including pharmacuticals, we forget about the natural ways. Natural ways take longer to work and don't last very long on a shelf so they aren't profitable. You have to think for yourself. The idea of taking supplements is to prepare your body for what might attack it so its ready for the fight, not avoid the fight all together. DE, garlic, ACV; all great for supplements to help a chicken's system work optimally but not 'cures' themselves. They set up conditions that make parasites, bacteria and viruses less likely to take control...
As Americans who are sold everything, including pharmacuticals, we forget about the natural ways. Natural ways take longer to work and don't last very long on a shelf so they aren't profitable. You have to think for yourself. The idea of taking supplements is to prepare your body for what might attack it so its ready for the fight, not avoid the fight all together. DE, garlic, ACV; all great for supplements to help a chicken's system work optimally but not 'cures' themselves. They set up conditions that make parasites, bacteria and viruses less likely to take control...