Head to head
Testosterone against Enclomiphene
Replacing the hormone against pushing the body to make more of it. Enclomiphene preserves sperm production, which replacement does not, and it has never been FDA-approved on its own after repeated complete response letters, so it reaches patients through compounding.
Column A
TestosteroneTestosterone, the principal androgen
The best-evidenced hormone on this site. A 5,246-man randomised trial settled the cardiovascular question, and 36 randomised trials in 8,480 women cover the half of the population nobody talks about.
Column B
EnclomipheneEnclomiphene citrate
The trans isomer of clomiphene, prescribed off-label through compounding to raise testosterone while preserving sperm production; never FDA-approved on its own after repeated complete response letters.
Side by side, on the facts we can check
| Attribute | Testosterone | Enclomiphene |
|---|---|---|
| Category | Hormone | Hormone |
| FDA status | FDA-approved for male hypogonadism in multiple formulations. Schedule III controlled substance in the United States. No testosterone product is approved for women in the United States, which is a documented gap rather than a judgement on the evidence. | Not FDA-approved (complete response letters); available as a compounded prescription |
| Half-life | Free testosterone itself clears in minutes to hours. What determines dosing is the ester: cypionate and enanthate run roughly eight days, propionate under a day, and undecanoate several weeks. The ester pages cover what that means in practice. | Once-daily oral dosing |
| Molecular weight | 288.4 Da. A steroid, not a peptide. | 406.0 Da |
| Mechanism | A 19-carbon steroid synthesised from cholesterol, mainly in the Leydig cells of the testis under luteinising hormone control, and in smaller amounts by the ovary and adrenal in women. It acts directly on the androgen receptor, a nuclear receptor that binds DNA and alters transcription. Two conversions matter clinically: 5-alpha-reductase converts it to dihydrotestosterone, a more potent androgen responsible for much of the effect on scalp hair and prostate, and aromatase converts it to oestradiol, which is responsible for much of its effect on bone, mood and libido in men. Exogenous testosterone suppresses luteinising hormone and follicle-stimulating hormone through negative feedback, which is why it reduces sperm production and testicular size. | Selective estrogen receptor antagonism at the hypothalamus, increasing GnRH, LH and FSH and therefore endogenous testosterone. |
| Human studies cited | 2 | 1 |
| Legal status, US | FDA-approved, prescription only | Prescription via compounding pharmacies; not FDA-approved |
Frequently asked questions
What is the difference between Testosterone and Enclomiphene?
Testosterone: The best-evidenced hormone on this site. A 5,246-man randomised trial settled the cardiovascular question, and 36 randomised trials in 8,480 women cover the half of the population nobody talks about. Enclomiphene: The trans isomer of clomiphene, prescribed off-label through compounding to raise testosterone while preserving sperm production; never FDA-approved on its own after repeated complete response letters.
Which has stronger research evidence, Testosterone or Enclomiphene?
This database does not grade compounds. It counts what was run in people: 2 of the 5 studies cited on the Testosterone profile were human work, against 1 of 2 for Enclomiphene. Those counts are of our own citation lists and understate any larger literature, and neither is a recommendation.
Are Testosterone and Enclomiphene FDA-approved?
Testosterone: FDA-approved for male hypogonadism in multiple formulations. Schedule III controlled substance in the United States. No testosterone product is approved for women in the United States, which is a documented gap rather than a judgement on the evidence.. Enclomiphene: Not FDA-approved (complete response letters); available as a compounded prescription.
Reviewed Sep 2026. This page sets two published records side by side. It is educational, it is not medical advice, and it contains no dosing protocols or recommendations for personal use.