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How long SARMs stay in your system depends on which compound you mean, how much was taken, for how long, and what kind of test is looking for it. Published excretion studies report windows from about two days to several weeks, and those figures are best treated as minimums.
The question matters for two reasons. Athletes in tested sports are banned from using SARMs at all times, and anti-doping labs are very good at finding them. And how long a compound is detectable is not the same as how long its effects last: suppressed testosterone can take weeks or months to recover after the drug itself has cleared.
This guide covers the factors that change detection times, what the research shows for each common SARM (and the non-SARMs usually sold alongside them), how anti-doping labs test, and whether a standard drug test picks them up.
Key Takeaways
- There is no single answer: published detection windows run from about 48 hours for YK-11 to around three weeks for LGD-4033, depending on the compound, dose, length of use and the test.
- Those figures come from small administration studies, several after a single dose. Repeated use at higher doses, and ever more sensitive lab methods, can push detection well beyond them.
- Anti-doping labs detect SARMs and their long-lived metabolites in urine and blood, and WADA rules allow samples to be stored and retested for up to 10 years.
- Standard workplace drug panels usually don’t include SARMs, but specialised tests for anabolic agents do, and routine bloodwork can show their effects, such as suppressed testosterone and lower HDL cholesterol.
- Many products sold as SARMs are mislabelled, so a test can come back positive for a compound the user never knew they took.
How Long Do SARMs Stay in Your System?
Selective androgen receptor modulators (SARMs) are synthetic compounds that bind to the androgen receptor, the same receptor testosterone acts on. Researchers began developing nonsteroidal SARMs in the late 1990s as possible treatments for muscle wasting and osteoporosis, aiming for drugs that act on muscle and bone with less effect on other tissues than anabolic steroids [1].
None has been approved for medical use, but their effects on muscle and fat made them popular in bodybuilding and sport, and they soon started turning up in doping cases [2].
The short answer: how long SARMs stay in your system depends on which SARM it is, how much and how long it was used, the person, and the test (full list below).
Human excretion data exists for only a handful of compounds, and most of it comes from small studies. Where there is no data, nobody can give a reliable window, and anyone who quotes one is guessing.
Factors That Influence SARM Detection Windows
- The compound and its metabolites: each SARM is broken down differently. Anti-doping labs target the metabolites that stay in the body longest, which is why detection often lasts far longer than the parent drug.
- Half-life: as a rule of thumb, most of a drug is gone after about five half-lives. Sensitive tests can still find traces after that, so the half-life gives a floor, not a ceiling.
- Dose and time spent ‘on’: this is one of the biggest factors. Larger doses and longer use leave more drug and metabolites to clear, and compounds with long half-lives build up with daily dosing.
- Individual metabolism: differences in liver enzymes, age, and liver and kidney function mean the same dose can clear faster in one person than in another.
- Lean body mass: body composition affects how fast any drug is cleared. As one review of drug dosing puts it, as “lean body weight increases there will be a corresponding increase in drug clearance” [3].
- The test itself: the sample type (urine, blood or hair), the lab’s sensitivity and which substances the panel includes all change what is found and for how long.
There is no evidence that any diet, supplement or “detox” product shortens SARM detection windows.
Detection Windows for SARMs
The table sums up what published studies report. Three of the compounds people usually group with SARMs are not SARMs at all: MK-677, Cardarine and SR9009 work through different pathways, but they are sold by the same vendors and banned by WADA, so they are included here.
| Compound | What it is | Reported detection window |
|---|---|---|
| Ostarine (MK-2866) | SARM | Up to about 9 days after a single dose |
| LGD-4033 (Ligandrol) | SARM | Up to about 21 days |
| RAD140 (Testolone) | SARM | Up to about 8 days after a single dose |
| YK-11 | Steroidal SARM | 48 hours or more |
| Andarine (S4), LGD-3303, S-23 | SARMs | No reliable human data |
| MK-677 (Ibutamoren) | Growth hormone secretagogue, not a SARM | Two to three weeks |
| GW501516 (Cardarine) | PPAR-delta agonist, not a SARM | Four to five weeks |
| SR9009 (Stenabolic) | Rev-erb agonist, not a SARM | No human data |
Read these as minimums. They come from small administration studies, several of them after a single dose, while people who use SARMs typically take them daily for weeks. Labs also keep finding longer-lived metabolites and lowering their detection limits, so windows measured years ago may be shorter than what a lab can detect today.
How long does Ostarine (Enobosarm, MK-2866, S-22) stay in your system?
Up to about 9 days after a single dose in one excretion study [4]. Ostarine is the most studied SARM in humans and one of the SARMs most often reported in anti-doping cases. It has also turned up as a contaminant in supplements, which is one reason labs work to detect very small amounts. Daily use over weeks would be expected to leave it detectable for longer.
How long does Andarine (S4) stay in your system?
There is no reliable published human detection window for Andarine. It never completed clinical development, so human data is thin. It is named on WADA’s Prohibited List, so accredited labs screen for it.
How long does LGD-4033 (Ligandrol) stay in your system?
Up to about 21 days after administration in one excretion study [5]. LGD-4033 has a long elimination half-life, roughly 24 to 36 hours in a clinical trial in healthy young men, and labs target metabolites that outlast the parent compound. That makes it one of the longest-detectable SARMs, and, with Ostarine, one of the most often reported in doping cases.
How long does LGD-3303 stay in your system?
LGD-3303 (often misspelled “LGD-3033”) is an earlier Ligand compound that has been studied mainly in animals. There is no published human excretion data that we know of, so there is no reliable detection window.
How long does RAD140 (Testolone) stay in your system?
Up to about eight days after a single dose [6]. RAD140 has had only limited early-phase testing in humans, it is named on WADA’s Prohibited List, and repeated dosing would be expected to extend this window.
How long does S-23 stay in your system?
S-23 has never been tested in human trials. It was studied in rats as a possible male contraceptive, so there is no human data on how long it stays detectable.
How long does SR9009 (Stenabolic) stay in your system?
SR9009 is not a SARM. It is a Rev-erb agonist that has not been tested in human trials, so there is no human excretion data. WADA lists it among the prohibited metabolic modulators.
How long does Ibutamoren (MK-677, Nutrabol) stay in your system?
Two to three weeks after administration, according to one excretion study [7]. MK-677 is not a SARM but an oral growth hormone secretagogue. WADA prohibits growth hormone secretagogues under peptide hormones and growth factors.
How long does GW501516 (GW1516, Cardarine, Endurobol) stay in your system?
Four to five weeks after administration, according to one study [8]. Cardarine is not a SARM but a PPAR-delta agonist. Its development was abandoned after long-term animal studies found cancers, and WADA prohibits it as a metabolic modulator.
How long does YK-11 stay in your system?
48 hours or more for its metabolites [9]. YK-11 has a steroid structure, so it is not a true nonsteroidal SARM, and its muscle effects come from cell and animal studies, not human trials. The short window reflects limited data, not a guarantee that it clears quickly.
How Does the World Anti-Doping Agency Test for SARMs?
Doping control collects urine and, in some tests, blood. According to the WADA website, the athlete takes part in the collection like this:
- The athlete chooses a urine sample collection vessel from a selection made available by the doping control personnel
- If a blood sample is collected, the athlete chooses a blood collection kit from a selection made available by the doping control personnel
WADA-accredited labs analyse the samples mainly with liquid chromatography-mass spectrometry, which can identify SARMs and their metabolites at very low concentrations. Testing happens both in and out of competition, often without notice.
Two rules make detection windows less useful than they look. Samples can be stored and reanalysed for up to 10 years, so a sample that passes today can be retested with a more sensitive method later. And under strict liability, athletes are responsible for any prohibited substance found in their sample, however it got there.
Will SARMs Show Up in Normal Drug Tests?
Standard workplace drug panels look for drugs of abuse such as cannabis, cocaine, amphetamines and opioids. They don’t usually include SARMs, because testing for performance-enhancing drugs needs specialised and expensive lab methods.
That does not mean SARMs can’t be found. Specialised panels for anabolic agents exist and are used by sports bodies and some employers, and if a test is designed to look for SARMs, the windows above apply. Don’t assume you know what a test covers.
Routine blood tests won’t name a SARM, but they can show its effects: suppressed testosterone, LH and FSH, lower HDL cholesterol and, in some cases, raised liver enzymes. These changes can outlast the drug itself. See our guides to the long-term side effects of SARMs and PCT for SARMs.
Mislabelled Products and Positive Tests
What is in the bottle matters for testing too. A 2017 analysis in JAMA of products sold online as SARMs found that only about half contained a SARM at all, and many contained other unapproved drugs or ingredients not listed on the label. Someone who buys “Ostarine” can test positive for a different compound, at a different dose, with a different detection window.
For that reason, people who research these compounds look for vendors that publish independent third-party test results for each batch. A test result shows what is in the bottle; it does not make the compound safe to use, and it does not change the fact that SARMs are banned in sport.
Pros
- Exceptional purity & testing (≥98%)
- Pharmaceutical-style packaging for stability
- Broad catalog across peptides & nootropics
- Strong reputation & consistency across years
Cons
- Some items frequently out of stock due to high demand
- Limited long-term data for some compounds
Are SARMs Illegal?
The big question remains: are SARMs legal, and can buying or using them get you in trouble?
In sport, the answer is clear. SARMs are banned by WADA at all times, in and out of competition, and appear on its Prohibited List under anabolic agents. If you compete in a tested sport, any use can lead to a ban.
Outside sport, the law varies by country. In the US, no SARM is approved by the FDA and they cannot legally be sold as dietary supplements, which is why they are sold as “research chemicals” labelled “not for human use”. Some countries restrict them further, so check the rules where you live.
The Bottom Line
There is no fixed time for SARMs to leave your system: published windows run from about two days to several weeks after limited dosing, and modern anti-doping methods keep extending them.
- Treat published windows as minimums: they come from small studies, often after one dose, while typical use is daily for weeks.
- In sport, SARMs are banned at all times, samples can be retested for up to 10 years, and athletes are responsible for whatever is found.
- Standard drug panels rarely include SARMs, but specialised tests do, bloodwork shows their effects, and no detox product has been shown to speed clearance.
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