There is an element of science in the Ayuvedic methods used by my Hindu opposite number. According to the Mayo Clinic about one million bacteria are required to cause disease.
“Because more than a million cholera bacteria — approximately the amount you’d find in a glass of contaminated water — are needed to cause illness, cholera usually isn’t transmitted through casual person-to-person contact.”
I guess by diluting about 10000 times, he was only ever getting a restricted number of bacteria or viruses – which perhaps tended to provide a degree of daily oral immunization against a large number of different bugs (even perhaps flu as the pig/fish/duck/human cycle is fairly well proven in Asia).