A Myers’ cocktail is a popular IV therapy originally introduced by the late John Myers, MD. The formula is designed to treat a wide range of clinical conditions, including fatigue, muscle spasms, and fibromyalgia. In addition to saline solution, the standard Myers’ cocktail contains vitamin C, B-complex vitamins, vitamin B12, calcium, magnesium, zinc, and glutathione, a naturally occurring antioxidant in the body.