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Testosterone Cypionate vs Testosterone Enanthate

Last updated

The key difference

The same hormone with slightly different esters. Cypionate's ester is a little longer, but their release profiles are very similar and they are generally treated as interchangeable. Cypionate is the more common formulation in the US.

Side by side

What it is
Testosterone CypionateA long-acting injectable testosterone ester used clinically for testosterone replacement therapy (TRT) in men with diagnosed hypogonadism. Prescription medication.
Testosterone EnanthateA long-acting injectable testosterone ester used for testosterone replacement therapy. Clinically near-interchangeable with cypionate. Prescription medication.
Research status
Testosterone CypionateClinical
Testosterone EnanthateClinical
Category
Testosterone CypionateHormones & TRT
Testosterone EnanthateHormones & TRT
Half-life
Testosterone Cypionate~8 days (cypionate ester)
Testosterone Enanthate~7 days (enanthate ester)
Routes
Testosterone CypionateIntramuscular, Subcutaneous
Testosterone EnanthateIntramuscular, Subcutaneous
Reported dosing
Testosterone CypionateTRT protocols reported in the literature are typically 100-200 mg per week, often split into two injections, titrated to trough serum testosterone and symptoms. Dosing must be individualized and supervised by a physician.
Testosterone EnanthateReported TRT dosing is typically 100-200 mg per week, frequently split, titrated to labs and symptoms under physician supervision.
Studied for
Testosterone Cypionate
  • Restores serum testosterone in diagnosed hypogonadism
  • Supports libido, energy, mood, and cognition when levels are low
  • Preserves lean mass and bone mineral density
Testosterone Enanthate
  • Restores serum testosterone in diagnosed hypogonadism
  • Supports libido, mood, energy, lean mass, and bone density
  • Stable levels with weekly or split dosing
Side effects
Testosterone Cypionate
  • Erythrocytosis (elevated hematocrit)
  • Estrogen-related effects (water retention, gynecomastia) via aromatization
  • Testicular atrophy and suppressed fertility
  • Acne, oily skin
Testosterone Enanthate
  • Erythrocytosis (elevated hematocrit)
  • Estrogenic effects via aromatization
  • Testicular atrophy and reduced fertility
  • Acne, oily skin
Cited studies
Testosterone Cypionate4 on its page
Testosterone Enanthate4 on its page

How Testosterone Cypionate works

Testosterone cypionate is an esterified form of the endogenous androgen testosterone. After intramuscular or subcutaneous injection it is slowly released and cleaved to free testosterone, which binds the androgen receptor to drive secondary sexual characteristics, muscle protein synthesis, bone density, erythropoiesis, libido, and mood. The cypionate ester extends the half-life so dosing every 3.5-7 days maintains stable serum levels.

Full Testosterone Cypionate profile →

How Testosterone Enanthate works

An esterified testosterone that is slowly released after injection and cleaved to free testosterone, which activates the androgen receptor. Pharmacokinetics are very similar to cypionate; the enanthate ester gives a comparable multi-day half-life supporting weekly or twice-weekly dosing.

Full Testosterone Enanthate profile →

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