You're speaking of classical homeopathy, not practical observation. In practice there are many homeopathic products with varying dilutions, many of which have a meaningful amount of the substance, and therefore the distinct possibility of a biological effect.
Sure, but homeopaths would consider the less diluted ones to be the weaker “medicine”!
Agree! Someone once told me that homeopathic doctors often put significant amounts of allopathic medicine in their “homeopathic” concoctions. Does wonders for effectiveness! Perpetuating the classical myth in this manner is also great for business!
Of course, there are also a number of cases where western “supplements” were caught containing actual prescription medicine, not just natural precursors or such. Same idea…