"One of the most important studies showing the positive effect chiropractic care can have on the immune system and general health was performed by Ronald Pero, Ph.D., chief of cancer prevention research at New York's Preventive Medicine Institute... ..." Pero R. “Medical Researcher Excited By CBSRF Project Results.” The Chiropractic Journal, August 1989; 32. Knowing the importance to have a great sleep and immune system, Chiropractic Care does boost your immune system. Do contact us www.natrahea.com to find out more. #chiropractic #natrahea #immunesystem #immunity