Hexarelin Side Effects: What Is Reported, Cortisol and Prolactin, and What to Report

The medication this page covers:

The price is all-in: medication, physician review, refill management and shipping, with no membership fee. Pepti is cash-pay and does not bill insurance. Compounded medications are not FDA approved, and hexarelin has never been an approved drug.

Most side-effect pages are built from an approved drug label with rates against placebo. Hexarelin has no label, because no pharmaceutical program took it forward.

Across that record, single doses were consistently reported as well tolerated, and the sixteen-week subcutaneous study and the eight-month pediatric course reported no significant adverse effects. That is a deeper human record than most compounded peptides have. It is still small, old, and not a modern safety database, so what people feel at compounded doses comes from prescribing experience plus what is known about growth hormone itself.

This is what separates hexarelin from ipamorelin. Hexarelin stimulates not only the pituitary cells that make growth hormone but also those that make ACTH and prolactin. A 1997 study in Peptides compared hexarelin and GHRP-2 in young adults and reported that both raised prolactin, ACTH and cortisol; the ACTH and cortisol response was similar in size to that from corticotropin-releasing hormone, while the prolactin response was smaller than that from TRH.

The reassurance is in the 24-hour data. A 2002 study in the European Journal of Endocrinology gave six young men two or three subcutaneous injections across a day and reported that 24-hour prolactin, ACTH and cortisol did not change. So each dose adds a short pulse rather than raising the daily total. It is still a real effect, and the reason hexarelin is not a first choice for anyone with a condition sensitive to cortisol or prolactin. Ipamorelin was designed to keep the growth hormone pulse without them; see ipamorelin side effects.

The most important finding for anyone considering a course is from the Journal of Clinical Endocrinology and Metabolism in 1998. Healthy elderly volunteers were given twice-daily subcutaneous hexarelin for sixteen weeks. The growth hormone response to a test dose fell by about a third by week one, by more than a third by week four, and by nearly half by week sixteen. Four weeks after stopping, it had returned to baseline. Over the same sixteen weeks, IGF-1, total body fat, lean mass and bone density did not change significantly.

This is not harmful in itself, and it reverses. It is the reason the reviewed schedule is five nights on and two off: intermittent schedules in older adults did not show desensitisation in shorter studies. Never add doses because you feel less; report it to your care team instead.

Anything that raises growth hormone and IGF-1 carries the class risks in approved growth hormone labelling: glucose intolerance, fluid retention and a theoretical concern about existing tumors. No data show hexarelin is exempt.

Bloodwork is not required for any Pepti treatment. If your physician wants labs for your care, they'll ask through your account.

Hexarelin binds receptors on heart muscle, including one called CD36, and the effect is real: in every human study that looked, a single intravenous dose produced a measurable, short-lived rise in the heart's contractility. In a 1999 study in seven male volunteers, ejection fraction rose from 64 to about 71 percent for roughly an hour, with no change in blood pressure or heart rate. That is described as protective in animals, but no study has looked at ongoing subcutaneous dosing in people with heart disease. Anyone with a cardiac diagnosis should raise it at intake rather than assume it is a benefit. New palpitations, chest pain or breathlessness are not expected effects: contact your care team the same day, and call 911 for chest pain or severe breathlessness.

Dosing errors

The directions are printed on the vial in millilitres and units: 0.25 mL is 25 units on a U-100 syringe. If you think you may have taken too much, call Poison Control at 1-800-222-1222 and message your care team. Never take an extra dose to make up for a missed night, and never change your own dose.

Interactions, and other medications

There is no established interaction list, because the trials that would produce one have not been run. List every medication and supplement on your intake, especially anything for blood sugar, steroids and other growth-hormone-axis peptides.

CJC-1295 / Ipamorelin combines both halves in one vial. The safety analysis of that pairing is in is CJC-1295 / Ipamorelin safe.

Hexarelin's human pharmacology is unusually deep for a compounded peptide, and it consistently describes single doses as well tolerated. The cortisol and prolactin pulse, desensitisation with continuous dosing and the acute cardiac effect are all measured human findings. That much is established.

The limits: the studies are small and nearly all from 1994 to 2003; the longest adult course was sixteen weeks; none was a randomized trial of the use it is prescribed for; and there is no long-term safety data or interaction list. Hexarelin is not on any of the FDA's 503A category lists and has never been reviewed by its compounding advisory committee, so the FDA has made no determination either way. Compounded medications are not FDA approved.

Hexarelin cannot be bought legitimately without a prescription. Sites selling it "for research use only" are not accountable for identity, purity, sterility or concentration. The prescription route:

1. Complete a free online intake covering your history, medications, diabetes, cancer and heart history, and what you want help with.
2. A physician licensed in your state reviews it, usually within 24 hours.
3. If it is appropriate, a PCAB-accredited, FDA-registered US 503A compounding pharmacy prepares it to that prescription. Lot test results are published at /quality/lab-results.
4. It ships refrigerated with ice packs, with sterile syringes and alcohol prep pads, and your directions printed on the vial.
5. Your physician stays reachable for side effects and questions. Refills run every 28 days, one vial per fill.