Flex Pharma, Inc. (Flex Pharma) is a biotechnology company. The Company is engaged in developing and commercializing products for nocturnal leg cramps, spasms associated with neuromuscular conditions and exercise associated muscle cramps. The Company focuses on its drug development efforts on developing a product to treat nocturnal leg cramps. It develops products based on the mechanism of muscle cramp and spasm inhibition. Flex Pharma’s treatment contains three active ingredients: ginger extract, an activator of both TRPV1 and TRPA1 ion channels; cinnamon extract, an activator of TRPA1 ion channels, and capsicum, an activator of TRPV1 ion channels. The Company is also developing a consumer brand with products based on the same mechanism of action as its treatment. In three randomized, blinded, placebo-controlled, cross-over studies, Flex Pharma's treatment has shown a reduction in the intensity of muscle cramps.