Homoeopathy
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He realized that, very ironically, the 'medical science' is not based on any fundamental scientific laws. And the theories on which the medicine of his time was based were vague and hypothetical. And the treatment often caused more harm than good. So he left his medical practice and started translation work instead.
Homeopathic medicines act by stimulating body's own defense mechanism to correct the process which has lead to the disease condition. According to our current understanding, the medicines act as a electromagnetic signal, which is picked up by nerves and relayed to higher centers of the brain, which in turn stimulates our bodies healing powers to take specific corrective measures. Medicines tell the body 'What to do?' - the actual work is done by the body itself.