Cal. Rev. & Tax. Code § 6369
(a) There are exempted from the taxes imposed by this part the gross receipts from the sale in this state of, and the storage, use, or other consumption in this state of, medicines:
(b) “Medicines” as used in this section, means any substance or preparation intended for use by external or internal application to the human body in the diagnosis, cure, mitigation, treatment, or prevention of disease and commonly recognized as a substance or preparation intended for that use. However, “medicines” does not include any of the following:
(c) Notwithstanding subdivision (b), “medicines” as used in this section means and includes any of the following:
(3)