Enobosarm vs Testosterone
Written by Aaron CuhaReviewed Sep 2026
The short answer
The targeting argument, put to the test. Drugs like this were designed to act on muscle and bone without testosterone's effects on the prostate and heart. Testosterone has the 5,246 man safety trial. Enobosarm has no approval for any use.
- Enobosarm people
- 159
- Enobosarm nulls
- 1
- Testosterone people
- 5,246
- Testosterone nulls
- 0
Dose
No human dose established
Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.
1 completed trial, 159 people given it
Dose
Approved medicine. No human dose established for unlabelled uses
Labeled amounts sit on the prescribing information. This page records what trials measured, not a personal dose.
FDA-approved in several forms for male hypogonadism, when a man's body makes too little testosterone. A Schedule III controlled substance in the United States. No testosterone product is approved for women in the United States. That is a known gap, not a verdict on the evidence.
First-hand reports are counted on each profile and never added together. This page sets two published records side by side. It does not pick a winner.
Column A
EnobosarmEnobosarm (ostarine, GTx-024, MK-2866)
The drug sold on the grey market as ostarine. In proper studies, 3 mg added to semaglutide cut muscle loss by 71 percent in adults over 60.
Column B
TestosteroneTestosterone, the principal androgen
The best-tested hormone on this site. A study of 5,246 men settled the heart safety question. A review that pooled 36 studies in 8,480 women covers the half of people nobody talks about.
Side by side, on the facts we can check
| What we compare | Enobosarm | Testosterone |
|---|---|---|
| Category | Muscle & Performance | Hormone |
| FDA status | Investigational; not approved for any use. SARMs are lab-made drugs that act like testosterone. Unapproved SARM products are illegal to sell as supplements. | FDA-approved in several forms for male hypogonadism, when a man's body makes too little testosterone. A Schedule III controlled substance in the United States. No testosterone product is approved for women in the United States. That is a known gap, not a verdict on the evidence. |
| Half-life | ~24 hours (once-daily oral) | 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. |
| Molecular weight | 389.3 Da | 288.4 Da. A steroid, not a peptide. |
| How it works | It switches on the androgen receptor mostly in muscle and bone. That helps build muscle protein, with less effect on the prostate and skin than testosterone. | Testosterone is a steroid hormone the body makes from cholesterol. In men it is made mostly in the testicles, on a signal from the brain. Women make smaller amounts in the ovaries and adrenal glands. It works by attaching to the testosterone receptor inside cells, which changes which genes are switched on. The body turns some of it into two other hormones. One is DHT, a stronger form that drives much of its effect on scalp hair and the prostate. The other is estrogen, which drives much of its effect on bone, mood and sex drive in men. Taking testosterone tells the brain to stop sending its own signals to the testicles. That is why it lowers sperm count and shrinks the testicles. |
| Studies in people | 3 | 2 |
| Evidence | Moderate: 1 completed trial, 159 people given it | Moderate: 1 completed trial, 5,246 people given it |
| Legal status, US | Investigational; SARMs are not legal supplement ingredients and are banned in sport (WADA) | FDA-approved, prescription only |
Frequently asked questions
What is the difference between Enobosarm and Testosterone?
Enobosarm: The drug sold on the grey market as ostarine. In proper studies, 3 mg added to semaglutide cut muscle loss by 71 percent in adults over 60. Testosterone: The best-tested hormone on this site. A study of 5,246 men settled the heart safety question. A review that pooled 36 studies in 8,480 women covers the half of people nobody talks about.
Which has stronger research evidence, Enobosarm or Testosterone?
Each compound gets a band worked out from facts we counted, with the math shown. Enobosarm is Moderate (1 completed trial, 159 people given it). Testosterone is Moderate (1 completed trial, 5,246 people given it). That counts how much has been done in people. It does not rate whether either one works, and neither one is called the winner.
Are Enobosarm and Testosterone FDA-approved?
Enobosarm: Investigational; not approved for any use. SARMs are lab-made drugs that act like testosterone. Unapproved SARM products are illegal to sell as supplements.. Testosterone: FDA-approved in several forms for male hypogonadism, when a man's body makes too little testosterone. A Schedule III controlled substance in the United States. No testosterone product is approved for women in the United States. That is a known gap, not a verdict on the evidence..
Reviewed Sep 2026. This page puts two published records side by side. It is for learning, and it is not medical advice. When this site shows a dose, it is the dose a trial or a clinic actually used, or what people say they did, with the source attached. None of it tells you what to take.