Triptorelin
A prostate-cancer hormone drug that, as a single 100 mcg microdose, some use to restart testosterone after a cycle. Easy to get wrong.
What it is
Triptorelin is for one narrow situation: a man coming off an anabolic steroid or testosterone cycle whose own production has not restarted, who wants a single shot to kick the system back on before (or alongside) a standard SERM-based recovery. In medicine it is used for the opposite purpose, to shut testosterone off, and the line between the two is dose and repetition.
The person who uses it has finished a cycle, waited for the esters to clear, and has bloodwork showing low LH, low FSH and low testosterone that is not coming back on its own. That is the only use that makes sense outside a clinic. Anyone still on testosterone, anyone on TRT who wants to stay on it, anyone with a prostate or hormone-sensitive cancer history, and any tested athlete (GnRH agonists are banned for men at all times) should not be anywhere near it. Women do not use it this way.
What happens after a single 100 mcg microdose is a surge: LH and FSH spike within hours, and testosterone follows over the next few days. If the shot does its job, that one surge is enough to get the testes responding again, and repeat bloodwork at two to three weeks shows LH, FSH and testosterone holding on their own. What you may feel is a brief lift in energy and libido in the first week. What you will not get is a lasting fix if the underlying suppression is deep or if you keep taking it: repeat or continuous dosing is exactly how the drug shuts the axis down.
One shot of 100 mcg subQ, once. Reconstitute a 2 mg vial with 1 ml so that 100 mcg is 5 units, and draw carefully, because the amount matters more here than with any other peptide on this site. Then get bloodwork at two to three weeks (LH, FSH, total testosterone, estradiol). If the numbers have not moved, a second 100 mcg no sooner than four weeks later is the most anyone sensible does. Most people run it at the start of a SERM-based PCT (clomiphene or enclomiphene) and let the SERM carry the recovery. The mistakes are the obvious ones: dosing it like gonadorelin (daily or several times a week), dosing it while testosterone is still in your system, and skipping the bloodwork that tells you whether it worked. The depot tier (3.75 to 11.25 mg) is the prescription cancer form and has no place in a restart.
The approved evidence is excellent and points the other way: continuous or depot triptorelin reliably drives testosterone to castrate levels, which is why it is used for advanced prostate cancer and to pause early puberty, and why its initial flare is a known side effect clinicians have to manage. The microdose-restart idea rests on that same flare, on small studies of low-dose GnRH agonists used as triggers in fertility clinics, and on case reports from the steroid community. There is no controlled trial of triptorelin for post-cycle recovery, and no data on how often a single shot does harm instead of help.
If you are on TRT and want to keep fertility and testicular function, hCG is the proven tool, with gonadorelin as the gentler GnRH option; neither is triptorelin. If you are coming off a cycle, a SERM-based PCT is far better studied than any single-shot restart, and triptorelin is at most an add-on at the start of it. If your natural production was low before you ever used anything, no restart shot will fix that, and you need an endocrine workup.
What people use it for
Prostate cancer and early puberty
Most evidenceContinuous triptorelin desensitizes the pituitary and drops testosterone to castrate levels within weeks, which is its approved, well-trialed use in advanced prostate cancer (Trelstar) and central precocious puberty (Triptodur). This is the opposite of what the restart crowd wants, and it is what repeat dosing will do to you.
One-shot testosterone restart
Early daysThe off-label hope: a single low dose triggers the initial LH and FSH flare and kickstarts testicular production after a steroid cycle. Support is case reports and the known pharmacology of the flare, with no controlled trial, no agreed dose beyond the community 100 mcg, and no data on failure rates. Treat it as unproven and run it with bloodwork.
Fertility clinic triggers
Some evidenceLow doses of GnRH agonists, including triptorelin, are used in IVF to trigger ovulation by the same surge mechanism, which is the clinical precedent for the idea that one small dose causes one big LH spike. It shows the flare is real and dose-dependent; it says nothing about long-term male axis recovery.
How people use it
Safety, in brief
Things people sometimes notice
- A brief surge: more energy and libido in the first week
- Hot flashes or a flushed feeling in the first days
- Mild fatigue as the surge settles
- Injection-site soreness
The full picture — stop signs and who should talk to a doctor first — is on the dosing guide.
Sources
The labels and studies behind this page. Each link opens the original on PubMed, DailyMed or ClinicalTrials.gov.
- Trelstar (triptorelin pamoate) prescribing information
- Comparative efficacy of triptorelin pamoate and leuprolide acetate in men with advanced prostate cancer
- Efficacy and safety of triptorelin 6-month formulation in patients with central precocious puberty
- Gonadotropin-releasing hormone agonist trigger in oocyte donors co-treated with a gonadotropin-releasing hormone antagonist: a dose-finding study