Fun fact, Samuel Hahnemann was a pioneer in medical research. He was absolutely a quack, but in the absence of actual knowledge and understanding of physiology, his methods were at least rigorous. At the time, the practice of bloodletting was common, and he accurately decried the practice as doing more harm than good.

In his efforts to advance medical knowledge, the guy would ingest known poisons in small quantities and document how it made him feel. "This upsets my stomach, it must be good for indigestion, that one makes me cough, so it must be good for tuberculosis." He was willing to injure himself to learn medicine. He also poisoned his colleagues, students, and healthy test subjects to further his research without killing himself.

The concept that like treats like was revolutionary. It was completely wrong, but it was not entirely irrational and it led to several important discoveries. The most famous example of a homeopathic success story is nitroglycerin. It causes heart palpitations, and has been one of the most successful heart attack interventions ever discovered.

Of course, we now have the scientific method, medical ethics, informed consent, and a much clearer understanding of human physiology and biology. We now know that homeopathy is crap. Even wt the time, dilution and succussion were entirely irrational, and anyone selling homeopathic remedies today ought to be charged with fraud. But still, it's an interesting bit of medical and scientific history that most people dismiss entirely.