Compounds / Anabolic / Testosterone Cypionate

Testosterone Cypionate

Testosterone Cypionate (Long-Acting Testosterone Ester)
AnabolicFDA: FDA-APPROVED (hypogonadism —...WADA: PROHIBITED — Category S1

Overview

FDA-approved testosterone replacement therapy. Most prescribed testosterone ester in the US. Extensive clinical literature on hypogonadism, TRT outcomes, cardiovascular effects, bone density, body composition. Half-life ~8 days enables weekly dosing.

Mechanism of Action

Testosterone ester — cypionate side chain extends half-life to ~8 days via slow hydrolysis from depot injection. Cleaved to free testosterone in circulation. Binds androgen receptor (AR) → nuclear translocation → gene transcription for protein synthesis, nitrogen retention, erythropoiesis, bone density, libido, mood. Also aromatizes to estradiol via CYP19A1.

Molecular Profile

Molecular weight
412.6 Da
CAS number
58-20-8

Key Research Findings

8-day half-life; FDA-approved TRT; AR agonism; aromatization to E2; erythropoiesis; bone density; protein synthesis.

Published Research

JCEM (2018)
Bhasin S et al. Testosterone Therapy in Men with Hypogonadism: AES Guidelines
View source
NEJM (2016)
Snyder PJ et al. Effects of Testosterone Treatment in Older Men (TTrials)
View source

Related Anabolic Compounds

Testosterone EnanthateTestosterone PropionateTestosterone SuspensionSustanon (Testosterone Blend)Nandrolone DecanoateNandrolone Phenylpropionate
Clinical Guidance

Research data is not a treatment plan. If you are considering Testosterone Cypionate, the questions that matter are whether it suits your history, your labs and your goals. That is a conversation with a licensed physician, not a lookup.

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