PCT after a SARMs cycle typically lasts 4 to 6 weeks, though the exact duration depends on which SARM you used, how long your cycle ran, and how suppressed your hormone levels are. Unlike longer-acting injectable steroids, SARMs are oral compounds with short half-lives, so you can start PCT immediately after your last dose rather than waiting days or weeks.
Why SARMs Require PCT
SARMs bind to androgen receptors selectively, but they still signal your brain to reduce its own testosterone production. Clinical data on LGD-4033 showed significant suppression of both follicle-stimulating hormone (FSH) and free testosterone at doses as low as 1 mg per day. A case report published in Springer Nature documented a man using SARMs whose total testosterone dropped to 145 ng/dL, well below the normal range of 250 to 1,100 ng/dL. His LH and FSH both fell below normal as well.
The encouraging part: that same patient saw his testosterone, LH, and FSH return to normal within 3 weeks of stopping SARMs. But that was a single case, and recovery speed varies. PCT exists to accelerate this process and prevent you from spending weeks in a low-testosterone state where you lose the muscle you gained and feel terrible.
When to Start PCT After Your Last Dose
Because SARMs are oral compounds that clear your system quickly, you start PCT the day after your last dose. This is different from injectable steroids like testosterone enanthate, where you’d wait 2 to 3 weeks for the drug to fully clear before beginning recovery. With SARMs, there’s no waiting period.
How Long PCT Should Last by Suppression Level
Not every SARM cycle causes the same degree of suppression. A short, low-dose Ostarine cycle is a different situation than 12 weeks of RAD-140 at higher doses. Your PCT length should reflect that.
For mild suppression (short cycles of Ostarine or low-dose LGD-4033 at around 5 mg), 4 weeks of PCT is generally sufficient. You may still feel some fatigue or reduced libido in the first week or two, but hormone levels typically bounce back relatively quickly at this level of suppression.
For moderate to heavy suppression (longer cycles of RAD-140, S-23, or higher-dose LGD-4033, or stacked compounds), plan for a full 6 weeks. Research on LGD-4033 showed that higher doses produced more pronounced FSH suppression, and compounds like S-23 and RAD-140 are widely considered more suppressive than Ostarine. Stacking multiple SARMs compounds the effect on your hormonal axis.
What PCT Drugs Do
PCT drugs work by blocking estrogen receptors in your brain. When your brain detects less estrogen signaling, it responds by ramping up production of LH and FSH, the two hormones that tell your testes to produce testosterone. This kickstarts your natural production rather than leaving your body to figure it out on its own.
Enclomiphene, a newer option gaining popularity for SARM recovery, has been studied in clinical trials at doses of 6.25 mg, 12.5 mg, and 25 mg daily. In a phase II trial, it consistently raised both LH and total testosterone into the normal range, with effects persisting for at least one week after stopping treatment. The 12.5 mg dose appeared to offer the best balance of reliability and response. A typical PCT protocol using enclomiphene runs 4 to 6 weeks at 12.5 to 25 mg daily.
Tamoxifen is the more traditional option. For SARM recovery specifically, users commonly run it at 20 mg daily for the first half of PCT, then taper to 10 mg daily for the remaining weeks. This tapering approach helps ease your body off the medication rather than cutting it abruptly.
Side Effects to Expect During PCT
PCT drugs come with their own side effects, which is one reason you don’t want to run them longer than necessary. Tamoxifen commonly causes hot flashes, fatigue, and sexual issues in men. Less commonly, it can increase the risk of blood clots. These side effects generally resolve once you stop taking it.
Enclomiphene tends to be better tolerated, partly because it’s the purified active isomer rather than the mixed compound found in standard clomiphene. Standard clomiphene (Clomid) is known for causing mood disturbances and, in some users, visual side effects like blurriness or floaters. Enclomiphene largely avoids these issues, which is a major reason it has become a preferred option.
How to Know If PCT Is Working
Blood work is the only reliable way to confirm recovery. The symptoms of low testosterone after a cycle include reduced or absent sex drive, difficulty with erections, fatigue, and sometimes depressive symptoms. Research on men withdrawing from androgens found that 54% of subjects experienced pronounced symptoms, primarily decreased sexual desire and depressive episodes. In some cases, these symptoms can become severe enough to drive people back to using compounds just to feel normal again, creating a cycle that’s hard to break.
Get a blood test before your cycle starts so you have a baseline. Then get another test 2 to 4 weeks after finishing PCT. You’re looking at total testosterone, free testosterone, LH, and FSH. A large study published in the Journal of the Endocrine Society found that men who used PCT after androgen cycles normalized their reproductive hormones in an average of 13.3 weeks from cessation, compared to 18.7 weeks for men who skipped PCT entirely. PCT users also had a significantly higher probability of full normalization: 48% versus 38%.
If your post-PCT blood work shows levels still below your baseline, particularly if LH and FSH remain low, your pituitary hasn’t fully recovered. In that situation, some users run a second shorter round of PCT or simply wait and retest in another 4 weeks, since the body often continues recovering on its own once the process has been jumpstarted.
When PCT Might Not Be Necessary
Very mild cycles, particularly short runs of Ostarine at low doses (under 10 mg for 4 to 6 weeks), may not suppress your hormones enough to warrant pharmaceutical PCT. The LGD-4033 clinical trial showed that lower doses caused minimal changes in LH levels. Some users in this situation opt for a recovery period with over-the-counter support (vitamin D, zinc, quality sleep, stress management) rather than adding another drug.
The only way to know for sure is blood work. If your post-cycle testosterone is within your normal range and you feel fine, you can likely skip PCT. If your levels have dropped meaningfully or you’re experiencing symptoms, 4 weeks of PCT is a reasonable minimum even for a mild cycle.