The Resonance Effect is both the author's story of her inspirational journey of having the courage to find her true calling and an account of the development of a remarkable newly rediscovered treatment, frequency specific microcurrent (FSM), that takes advantage of the body's ability to respond to frequencies in order to heal a number of chronic conditions. Carolyn McMakin, a chiropractor specializing in fibromyalgia and myofascial pain, describes her experience using a two-channel microcurrent device that has achieved astounding results that have changed medicine and created new possibilities for suffering patients over the past twenty years. Nerve pain, fibromyalgia, diabetic neuropathies, muscle pain, athletic performance, injury repair, joint pain, low back pain, neck pain, kidney stone pain, the kidney stones themselves, liver disease, diabetic wounds, brain and spinal cord injuries, PTSD, depression, shingles, asthma, ovarian cysts, abdominal adhesions, and scarring all respond to specific frequencies. McMakin explains that results are predictable, reproducible, and teachable—all without side effects—offering hope and healing to millions of people.

McMakin tells the story of how thousands of patients with conditions that did not respond to other medical therapies recovered from pain and disability through the non-invasive treatment that she developed. For example, asthma resolves with specific frequencies that remove inflammation, allergy reaction, and spasm from the bronchi. One frequency combination eliminates shingles pain in minutes and stops the shingles attack with a single three-hour treatment. Since 2005, a series of frequencies has been used to treat hundreds of PTSD patients. Post-surgical patients use FSM to reduce pain, prevent bruising, and increase healing. NFL, NHL, and Olympic athletes use it to heal injuries and improve performance. McMakin includes case histories that illustrate the efficacy of the treatment and shares the specific frequencies that each condition requires so that patients direct their own treatments.

Carolyn McMakin graduated from chiropractic college in 1994, developed frequency specific microcurrent (FSM) in 1996, and began teaching it in 1997. In addition to maintaining a part-time clinical practice, she teaches seminars on the use of FSM in the United States, Australia, Europe, and the Middle East. She has authored eight clinical research papers, lectured at the National Institutes of Health and at medical conferences in the United States, England, Ireland, and Australia on the subjects of fibromyalgia and myofascial pain syndrome, fibromyalgia associated with spine trauma, and on the differential diagnosis and treatment of pain and sports injuries. Her textbook, Frequency Specific Microcurrent in Pain Management, was published by Elsevier in 2010. In addition to treating patients and publishing articles, she has taught courses on frequency specific microcurrent therapy around the world and now maintains a part-time practice in Portland, Oregon.