Formulations and methods for transdermal drug delivery compositions that include synergistic combination of three pharmaceutical active ingredients (APIs), such as testosterone, anastrozole, and HCG are disclosed. TBTC of the present disclosure may be indicated for reducing symptoms of testosterone deficiency. Disclosed TBTC may include permeation enhancers that may improve penetration of testosterone, anastrozole, and HCG in human skin. Permeation enhancer compositions within TBTC may include oils from amazon rainforest such as Pracaxi oil, Plukenetia volubilis seed oil, Inaja oil, and Patauá oil, which includes behenic and oleic fatty acids that may provide penetration power. TBTC may include organic solvents as transdermal penetration enhancers. Additionally, TBTC may include physiological lipids, phospholipids, and one or more butters rich in linoleic acid and linolenic acid that may also provide penetration power with restorative benefits to the skin.
