AAS

Testosterone Enanthate

Primary endogenous androgen esterified for sustained depot release

Evidence: 14 articles

Goals: 2

Mechanism of Action

Testosterone enanthate is an esterified form of testosterone. After intramuscular injection, the enanthate ester is slowly hydrolyzed, releasing free testosterone. Testosterone diffuses into cells and binds to the androgen receptor (AR), forming a complex that translocates to the nucleus and modulates gene transcription via androgen response elements (AREs). Downstream effects include increased protein synthesis, nitrogen retention, erythropoiesis via erythropoietin stimulation, and suppression of endogenous gonadotropins (LH/FSH) via negative feedback at the hypothalamic-pituitary axis.

Evidence Level

Clinical Trial - Human

14 studies published

Studied For

Muscle & Tissue Growth

Growth hormone secretagogues and IGF-1 axis research.

Sexual Health & Libido

Bio-regulators modulating sexual function, libido, and reproductive signaling pathways.

Pharmacology

Molecular Weight

400.6 g/mol (free base); 452.6 g/mol (enanthate ester)

Half-Life

Approximately 4.5 days (intramuscular depot)

Bioavailability

Near 100% via intramuscular injection; negligible oral bioavailability due to first-pass metabolism