Homeopathy had its origins in treating the whole person and not just the disease
That’s actually holistic medicine, not homeopathy. Homeopathy was invented in the late 1700s as an evolution of the medieval belief in humours.
Homeopathy’s premise is that ‘like cures like’ (a substance that causes symptoms in healthy people can cure them in sick people), coupled with a belief that water has a spiritual memory that can be unlocked by ritually diluting and shaking until no molecules of the active ingredient remain. Common dilutions are 1:10^60 or higher.