Head to head
Testosterone against HCG
The two sides of the fertility problem in testosterone therapy. HCG is FDA-approved and acts like luteinising hormone to maintain testicular function; testosterone replacement suppresses the same signal, which is why the two are so often prescribed together rather than chosen between.
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
HCGHuman Chorionic Gonadotropin
An FDA-approved gonadotropin used in fertility and to maintain testicular function and testosterone production in men.
Side by side, on the facts we can check
| Attribute | Testosterone | HCG |
|---|---|---|
| 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. | FDA-approved for fertility and hypogonadism (not for weight loss) |
| 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. | ~24-36 hours |
| Molecular weight | 288.4 Da. A steroid, not a peptide. | ~36,700 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. | Activates LH receptors to stimulate testicular testosterone production and, in women, support ovulation and the corpus luteum. |
| Human studies cited | 2 | 2 |
| Legal status, US | FDA-approved, prescription only | FDA-approved, prescription only |
Frequently asked questions
What is the difference between Testosterone and HCG?
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. HCG: An FDA-approved gonadotropin used in fertility and to maintain testicular function and testosterone production in men.
Which has stronger research evidence, Testosterone or HCG?
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 2 of 4 for HCG. Those counts are of our own citation lists and understate any larger literature, and neither is a recommendation.
Are Testosterone and HCG 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.. HCG: FDA-approved for fertility and hypogonadism (not for weight loss).
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.