Article · Wikipedia archive · Last revised Jun 12, 2026

Testosterone stearate

Testosterone stearate, also known as testosterone octadecanoate, testosterone 17β-stearate, and androst-4-en-17β-ol-3-one 17β-stearate, is an injected anabolic-androgenic steroid (AAS) and an androgen ester – specifically, the C17β stearate (octadecanoate) ester of testosterone – which was never marketed. It is a prodrug of testosterone and, when administered via intramuscular injection, is associated with a long-lasting depot effect and extended duration of action. Testosterone stearate may occur naturally in the body.

Last revised
Jun 12, 2026
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Testosterone stearate
Clinical data
Other namesTestosterone octadecanoate; Testosterone 17β-stearate; Androst-4-en-17β-ol-3-one 17β-stearate
Routes of
administration		Oral, intramuscular injection
Identifiers
  • [(8R,9S,10R,13S,14S,17S)-10,13-Dimethyl-3-oxo-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl] octadecanoate
CAS Number
PubChem CID
ChemSpider
CompTox Dashboard (EPA)
Chemical and physical data
FormulaC37H62O3
Molar mass554.900 g·mol−1
3D model (JSmol)
  • CCCCCCCCCCCCCCCCCC(=O)O[C@H]1CC[C@@H]2[C@@]1(CC[C@H]3[C@H]2CCC4=CC(=O)CC[C@]34C)C
  • InChI=1S/C37H62O3/c1-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-35(39)40-34-23-22-32-31-21-20-29-28-30(38)24-26-36(29,2)33(31)25-27-37(32,34)3/h28,31-34H,4-27H2,1-3H3/t31-,32-,33-,34-,36-,37-/m0/s1
  • Key:FHJSGESOWQSDBH-MXFPRFFXSA-N

Testosterone stearate, also known as testosterone octadecanoate, testosterone 17β-stearate, and androst-4-en-17β-ol-3-one 17β-stearate, is an injected anabolic-androgenic steroid (AAS) and an androgen ester – specifically, the C17β stearate (octadecanoate) ester of testosterone – which was never marketed.12 It is a prodrug of testosterone and, when administered via intramuscular injection, is associated with a long-lasting depot effect and extended duration of action.1 Testosterone stearate may occur naturally in the body.3

It has been said that with longer-chain esters of testosterone like testosterone stearate, the duration of action may be so protracted that the magnitude of effect with typical doses may be too low to be appreciable.1

See also

See also

References

References

  1. Vitamins and Hormones. Academic Press. 1 January 1944. pp. 384–. ISBN 978-0-08-086599-7. {{cite book}}: ISBN / Date incompatibility (help)
  2. Josephy E, Radt F (1 December 2013). Elsevier's Encyclopaedia of Organic Chemistry: Series III: Carboisocyclic Condensed Compounds. Springer. pp. 3048–. ISBN 978-3-662-25863-7.
  3. Oettel M, Schillinger E (6 December 2012). Estrogens and Antiestrogens I: Physiology and Mechanisms of Action of Estrogens and Antiestrogens. Springer Science & Business Media. pp. 236–. ISBN 978-3-642-58616-3.