332 In the index

Testosterone Test

The main male sex hormone, FDA-approved for treating low testosterone and available in several medical forms. Decades of research firmly establish its benefits for restoring hormone-deficiency symptoms, along with well-documented effects on fertility, red blood cell counts, and heart-disease risk factors at high doses.

Also known as Test, T, Virosterone, Homosterone, Mertestate, Testim, Androderm, Testosteron, Androlin

Effects Build muscle Libido Lose fat

Routes Injectable Oral Topical

Legal status Controlled substance

WADA Banned at all times

3D Molecular Structure of C₁₉H₂₈O₂

Drag to rotate · scroll to zoom

Chemistry

Formula: C19H28O2
Molar mass: 288.4
CAS: 58-22-0
PubChem CID: 6013
IUPAC name: (8R,9S,10R,13S,14S,17S)-17-hydroxy-10,13-dimethyl-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one
InChIKey: MUMGGOZAMZWBJJ-DYKIIFRCSA-N

Reported dosing

User-reported

What has been reported in the literature and by users. This is a record of what is done, not a recommendation.

Typical dose 100-200 mg/week (TRT) or 50-100 mg/day gel/cream equivalent

Reported range 50-200 mg/week (TRT, injectable esters); off-label bodybuilding 'cycle' doses commonly reported far higher (300-1000+ mg/week), well above any approved replacement dose

Route Intramuscular/subcutaneous injection, transdermal gel, or patch

Frequency Once or twice weekly (injectable) or once daily (gel/patch)

Duration Chronic/ongoing (as prescribed for hypogonadism) or cycle-length (off-label bodybuilding use)

FDA-approved in multiple formulations for diagnosed hypogonadism, with dosing individualized via bloodwork; a Schedule III controlled substance for non-prescription use. Bodybuilding-community 'cycle' doses well above replacement levels are unsupervised and carry dose-dependent cardiovascular, hematologic, and hormonal risks.

Where this comes from FDA prescribing information; off-label user-reported dosing

There is no approved human dosing for this compound. The figures above are what users and vendors report, not what has been established as safe or effective. Treat them as a record of what is done, not as guidance.

Variants

Name	Abbr	Route	Notes
Testosterone enanthate	Test E	Injectable	Long ester, ~7 day half-life. The default for most cycles.
Testosterone cypionate	Test C	Injectable	Long ester, near-identical to enanthate; more common in the US.
Testosterone propionate	Test P	Injectable	Short ester, ~2 day half-life. Frequent injections, fast clearance.
Testosterone undecanoate	Test U	Injectable	Very long ester used in Nebido and oral Jatenzo.
Testosterone phenylpropionate	TPP	Injectable	Short-to-medium ester found in Sustanon blends.
Testosterone isocaproate	TI	Injectable	Medium ester, mainly seen as a Sustanon component.
Testosterone decanoate	TD	Injectable	Long ester, a Sustanon component.
Testosterone acetate	TA	Injectable	Very short ester, rarely used alone.
Testosterone suspension	Test S	Injectable	Unesterified testosterone in water; acts immediately, painful.
Sustanon 250	Sus	Injectable	A blend of four esters designed for a smoother release curve.
Testosterone gel	Gel	Topical	Transdermal testosterone used in prescribed replacement therapy.