The logic of homeopathy is similar to the logic of a vaccine (ingest a substance which produces annoying symptoms in the body) so it may have some effects (train the immune system) but the dose of the substance must be high enough, else it is probably useless... Most homeopathic pills have very low dose... (sometimes there is almost nothing in the pill)
see : https://www.youtube.com/watch?v=YiwaGnj8kPU