Coleus Forskohlii (Forskolin) for Testosterone Support

Research suggests that Coleus forskohlii extract and its active compound forskolin may support testosterone levels in men, with a 2021 systematic review identifying some positive evidence for this effect in human populations. The majority of supporting studies, however, are preclinical in nature — involving rat Leydig cells, hypogonadal mouse models, and cell differentiation experiments — where forskolin is primarily used as a biochemical tool to stimulate steroidogenesis by activating adenylyl cyclase and raising intracellular cAMP, mimicking the signaling role of luteinizing hormone. Studies indicate that in these laboratory and animal contexts, forskolin consistently enhances testosterone and related hormone production, and researchers have even leveraged this property to generate testosterone-secreting Leydig-like cells from fibroblasts and stem cells as potential therapeutic models. Because most of this evidence comes from cell and animal studies rather than well-controlled human clinical trials, broader conclusions about the magnitude or reliability of testosterone support in healthy human populations remain limited, and the systematic review represents the most direct — though not definitive — human-relevant evidence available.