Apple Cider Vinegar
Herbs
Acid and alkaline
Apple cider vinegar by Suzanne Humphries, MD and Roman Bystrianyk In 1899 Dr. Howe also demonstrated vinegar's ability to protect a person from acquiring smallpox. Those who used the vinegar protocol were able to take care of other people with smallpox without fear of contracting the disease. The author notes that, despite several hundred exposures, vinegar was protective against smallpox and was considered an "established fact."
Apple Cider Vinegar: Miracle Health System by Paul C Bragg