The oral compound that never finished a human trial.
RAD140 was built as a drug candidate, sold as a research chemical, and adopted by lifters before anyone finished asking whether it is safe. Here is what the record actually contains, the pharmacology, the trial that stopped, the case reports, and where the honest gaps are.
No dosing, sourcing, or protocols anywhere on this page. Educational reference only.
Not a steroid. Not a drug, either. Not yet.
Testolone is a selective androgen receptor modulator: a small nonsteroidal molecule that binds the same receptor testosterone does, but with a different shape and a different downstream signature in each tissue.
Anabolic steroids are testosterone derivatives. They flood every androgen receptor in the body and are also converted into estrogen and DHT, which is where much of the hair, prostate and cardiovascular cost comes from. RAD140 is not in that chemical family at all, it is an agonist at the androgen receptor that was engineered to favour muscle and bone over prostate and skin.
That is the design intent, and in animal models it broadly held. It is not the same claim as "safe in humans." Tissue selectivity is a ratio measured in rodents and primates; it does not remove the receptor from your pituitary, your liver, or your lipid metabolism.
"Selective" describes where the molecule prefers to act. It says nothing about what happens everywhere else it still acts.
It was built for cancer patients, not for a cut.
The compound came out of a pharmaceutical programme aimed at androgen-receptor-positive breast cancer and at muscle-wasting conditions, populations where losing lean mass is a mortality risk.
Radius Health advanced testolone into a Phase 1 study in women with AR-positive metastatic breast cancer. That is the entire human clinical footprint of the molecule: a small, early-phase, oncology-population trial. The programme did not continue to late-phase work, and no regulator has ever approved RAD140 for any indication in any country.
Everything else (the forum logs, the before-and-afters, the "research chemical" listings shipped in dropper bottles) happened outside that process, in a market with no manufacturing oversight and no adverse-event reporting.
One receptor, four different answers.
The receptor is the same in every tissue. What differs is the co-regulator machinery that assembles around it, which is why a single molecule can read as strongly anabolic in muscle and weakly androgenic in the prostate.
What people report, and what the evidence behind it is.
Each claim below is tagged with where it comes from. Almost nothing here rests on a controlled trial in healthy adults, because no such trial exists.
Regulators have warned that SARMs sold outside clinical use carry risks of liver injury and cardiovascular events, and published case reports describe drug-induced liver injury in otherwise healthy young men using RAD140. Suppression of your own testosterone is the expected outcome, not an edge case.
"Animal data" = rodent or primate studies. "Human reports" = published case reports or small early-phase data, not controlled efficacy trials. "Anecdote" = self-reported, unverified, unblinded, and usually alongside other compounds.
The order things tend to appear in.
This sequence is assembled from self-reports, not from trial data, and the unwanted changes arrive on the same clock as the wanted ones. It is a description, not a schedule to follow.
Earliest reports are neural rather than structural: better session output, higher aggression, occasional sleep disruption.
Visible lean gain in reports, and the window in which suppression and liver-enzyme changes start showing on bloodwork.
Libido loss, fatigue and mood flattening as endogenous production falls. Lethargy is among the most frequently described complaints.
How long the axis takes to return is not established in any study. Some retained mass is reported; so is prolonged suppression.
RAD140 is not the only route to a bigger anabolic signal.
Three paths get compared in the same conversation. They differ less in whether they work than in whether anyone will put their name on what is in the bottle.
What the sales pages leave out.
None of the following is fringe. It is the part of the profile that sits underneath a photograph of a lean torso and a discount code.
Public health agencies have issued advisories against SARM use outside clinical trials, citing liver injury and cardiovascular risk, and enforcement letters have gone to companies marketing them as supplements. RAD140 is also prohibited in sport at all times.
Every androgen agonist shuts down the axis it imitates. Recovery timelines for RAD140 have never been formally characterised, and no post-cycle protocol has been validated for it.
Published cases describe severe hepatotoxicity after weeks of use, with jaundice and months-long recovery. "Non-methylated, so liver-safe" does not survive the case literature.
Analytical surveys of SARM products found a substantial share misidentified, underdosed, overdosed, or containing entirely different compounds, including unapproved drugs.
There is no multi-year safety data in healthy adults, because the molecule never ran that study. Absence of reported harm at ten years is not evidence of safety at ten years.
RAD140 is detectable long after the last dose and is a recurring cause of sanctions in tested sport, including in athletes who say they took a contaminated supplement.
You want the result. You do not want the unknowns.
Strength, lean mass and recovery do not require a molecule whose safety column is blank. There are routes where the research was finished, the product is legal to sell for human use, and the company behind it is identifiable. That is a lower ceiling on risk, not on results.
Start with what is printed on the label and who printed it.
Questions people actually ask.
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An independent reference on testolone: the pharmacology, the clinical record, the gaps, and the above-board alternatives.
Educational content only. Nothing here is medical advice, a recommendation to obtain or use RAD140, or an offer to sell any compound. RAD140 (testolone) is not approved by any medical regulator for human use, is not a dietary supplement, and is prohibited in sport at all times by the World Anti-Doping Agency. Statements about reported effects describe published case reports, preclinical studies or self-reported user accounts as labelled, and are not claims of efficacy or safety. Speak with a licensed physician about hormonal health before making any decision.
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