Iatrochemistry has roots in alchemy, but served as a transition between alchemy and modern medicine as it was popular between approximately 1500 and 1700. Paracelsus was a firm believer in the connection between physical health and the balance of bodily fluids, which led to the development of iatrochemistry. This branch of both chemistry and medicine intended to provide medical solutions in the Renaissance. Image Source: Public Domain, https://upload.wikimedia.org/wikipedia/commons/4/4c/Celum_philosophorum_...