it's Susan E. Cayleff's "Nature's Path: A History of Naturopathic Healing in America"
(2016; ISBN 1421419033 978-1421419039);
looks to be quite the proponentry. Future Naturocrit Podcast episode material.
as a teaser, the index includes:
allopathy, basic science, Bastyr, homeopathy, iridology, life force,
Lindlahr, Lust, National College of Naturopathic Medicine,
National Council Against Health Fraud, quackery,
toxins, vaccination, vital force.