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Research Overview
Endogenous androgenic steroid hormone. Binds the androgen receptor (AR) to upregulate nitrogen retention, muscle protein synthesis, and red blood cell production. Aromatised to oestradiol by aromatase (CYP19) in adipose, bone, and brain tissue — influences mood, bone density, lipid metabolism, and libido. Reduced to dihydrotestosterone (DHT) by 5-alpha-reductase in androgen-target tissues (prostate, skin, scalp).
Overview
Testosterone is a 19-carbon steroid hormone synthesised primarily in the Leydig cells of the testes in male physiology, with smaller contributions from adrenal cortex and ovarian theca cells. It is the parent molecule of the anabolic-androgenic steroid family — every synthetic AAS is structurally derived from or referenced against testosterone.
Exogenous testosterone has been studied in clinical research for over seven decades. Documented research applications include treatment of male hypogonadism, gender-affirming hormone therapy, sarcopenia, osteoporosis, HIV-associated wasting, and post-surgical recovery. It is also the most-studied compound in performance enhancement research literature, with hundreds of trials examining effects on muscle mass, strength, body composition, and athletic performance.
Testosterone is supplied in multiple ester preparations — propionate, enanthate, cypionate, undecanoate, and unesterified suspension — which differ markedly in plasma half-life and dosing frequency. All ester forms hydrolyse in vivo to free testosterone; the ester chain controls release kinetics from the injection depot.
Compliance
Legal research alternatives are available instead — see below
FDA approved compound
Listed as prohibited under WADA anti-doping regulations
Prescription availability in Australia and internationally
In Australia, testosterone has no TGA approval for therapeutic use. Capital Peptides does not sell or supply testosterone — see the legal research alternatives below.
Pharmacology
Endogenous androgenic steroid hormone. Binds the androgen receptor (AR) to upregulate nitrogen retention, muscle protein synthesis, and red blood cell production. Aromatised to oestradiol by aromatase (CYP19) in adipose, bone, and brain tissue — influences mood, bone density, lipid metabolism, and libido. Reduced to dihydrotestosterone (DHT) by 5-alpha-reductase in androgen-target tissues (prostate, skin, scalp).
Support
Not sold directly — legal research alternatives
Capital Peptides does not sell or supply the compound described above. The peptides below are commonly researched alongside it and are available from us.
For research use only. Capital Peptides products are not approved by the TGA for therapeutic use. By purchasing you confirm you are a licensed research entity or qualified professional.