Nandrolone decanoate vs Testosterone
Written by Aaron CuhaReviewed Sep 2026
The short answer
A changed steroid against the hormone itself. Nandrolone's medical record is real, in dialysis and in bone, and it was still pulled from most markets. That is a useful reminder that a trial record and being on sale are separate facts.
- Nandrolone decanoate people
- 0
- Nandrolone decanoate nulls
- 0
- 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.
3 completed trials, 0 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
Nandrolone decanoateNandrolone decanoate, injectable 19-nortestosterone ester
Tested in people on dialysis, in burn patients, and in women with thin bones after menopause, in a review that pooled several studies. The medical record is real, and it was pulled from most markets anyway.
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 | Nandrolone decanoate | Testosterone |
|---|---|---|
| Category | Muscle & Performance | Hormone |
| FDA status | Was FDA-approved for anaemia, too few red blood cells, caused by kidney disease. Withdrawn from the United States market. A Schedule III controlled substance. Still licensed in some other countries. | 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 | Roughly 6 to 12 days as the decanoate ester, so it is dosed weekly or less often. Detectable metabolites persist far longer, which matters for anyone subject to drug testing. | 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 | 428.6 Da for the decanoate ester. A steroid ester, not a peptide. | 288.4 Da. A steroid, not a peptide. |
| How it works | Nandrolone is testosterone with one small piece removed. A long chemical tail is added so it releases slowly from an oil shot. It attaches strongly to the testosterone receptor. The body turns very little of it into estrogen. In some parts of the body, like the scalp and prostate, it gets turned into a weaker hormone. With testosterone, the opposite happens: it gets turned into a stronger one. That is why nandrolone is milder on scalp hair and the prostate. It is also part of why it is well known for causing sex problems, which surprises people since it is a steroid. | 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 | Limited: 3 completed trials, none stating how many people | Moderate: 1 completed trial, 5,246 people given it |
| Legal status, US | Withdrawn from the market; Schedule III | FDA-approved, prescription only |
Frequently asked questions
What is the difference between Nandrolone decanoate and Testosterone?
Nandrolone decanoate: Tested in people on dialysis, in burn patients, and in women with thin bones after menopause, in a review that pooled several studies. The medical record is real, and it was pulled from most markets anyway. 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, Nandrolone decanoate or Testosterone?
Each compound gets a band worked out from facts we counted, with the math shown. Nandrolone decanoate is Limited (3 completed trials, none stating how many people). 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 Nandrolone decanoate and Testosterone FDA-approved?
Nandrolone decanoate: Was FDA-approved for anaemia, too few red blood cells, caused by kidney disease. Withdrawn from the United States market. A Schedule III controlled substance. Still licensed in some other countries.. 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.