K
- John Harvey Kellogg - promoter of colon therapy at the Battle Creek Sanatorium in Battle Creek, Michigan.
- Will Keith Kellogg - inventor of corn flakes in 1894 and manager of the Battle Creek Sanitarium.
- Sebastian Kneipp - Bavarian priest who began the Nature Cure movement (1890s). Chiefly known for his contributions to hydrotherapy.
- Louis Kuhne - promoter of hydrotherapy, especially hip and sitz baths
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