Ancient doctors wrote formulas as decoctions (tang), pills (wan), or powders (san) for a reason. They thought the format of a formula contributed to its efficacy by strengthening certain functions or delivering the formula to a specific region of the body. Why is it called Xiaoyao San, not Xiaoyao Tang? Why wasn’t Liuwei Dihuang Wan designed as a decoction? Do we sacrifice a bit of the herbal power for convenience when we prepare a formula differently from the original? Join us in examining the importance of herbal formulations.