Flex Pharma, Inc., a biotechnology company, develops and commercializes products for the treatment of muscle cramps, spasms, and spasticity associated with neurological conditions and exercise-associated muscle cramps in the United States. It operates in two segments, Consumer Operations and Drug Development. The company's lead drug candidate is FLX-787, a single molecule, chemically synthesized, and dual transient receptor potential V1/A1 ion channel activator, which completed an exploratory Phase II clinical trial in Australia for the treatment of patients with multiple sclerosis. It also offers HOTSHOT, a consumer beverage to prevent and treat exercise associated muscle cramps. The company markets and sells its HOTSHOT products online through its direct-to-consumer Website and through third-party Websites, including a retailer that offers international shipping. Flex Pharma, Inc. was founded in 2014 and is headquartered in Boston, Massachusetts.