naturopathy; natural medicine
A system of treatment that relies on natural remedies, such as diet, herbs, and lifestyle changes, rather than conventional drugs or surgery.
She chose naturopathy to cure her illness.
代替医療 is a broader term for alternative medicine, while 自然療法 specifically refers to naturopathy, which emphasizes natural healing methods.
Compound of 自然 (nature) and 療法 (therapy, treatment).