Sermorelin

• Formerly approved (as Geref) for growth hormone deficiency in children with growth failure, and for testing pituitary growth hormone release
• No current FDA-approved use; the U.S. product was withdrawn in 2009

Sermorelin is a lab-made version of the first 29 amino acids of growth hormone-releasing hormone (GHRH), the signal from the brain that tells the pituitary gland to release growth hormone. It was once FDA-approved as Geref for children with growth hormone deficiency, but that product was discontinued in the United States. Today sermorelin is sold through compounding pharmacies and "anti-aging" and wellness clinics, mostly for energy, muscle, fat loss and sleep. This page explains its history, where it stands with FDA, and what the evidence actually shows.

How Sermorelin Works

Sermorelin binds GHRH receptors in the pituitary and prompts it to release its own growth hormone, in pulses. Growth hormone then raises IGF-1, made mostly by the liver, which carries many of growth hormone's effects on muscle, bone and fat.

Because it acts upstream of the pituitary, sermorelin only works if the pituitary is healthy and responsive, and the body's normal feedback can still limit how much growth hormone is released. That is why sermorelin is often described as "gentler" than injecting growth hormone itself. It is also very short-acting, which is why it was injected nightly.

FDA History and Current Status

Geref was approved in the 1990s as a diagnostic test of pituitary function and later to treat idiopathic growth hormone deficiency in children with growth failure. Its maker, EMD Serono, discontinued it, and FDA withdrew the approvals effective June 18, 2009.

In 2013, responding to a citizen petition, FDA published a determination in the Federal Register that Geref was not withdrawn for reasons of safety or effectiveness. That finding allows a generic version to be approved in the future. No company has brought one to market, so there is no FDA-approved sermorelin product sold in the U.S. today.

Compounded Sermorelin

Sermorelin used now comes from compounding pharmacies, which mix it for individual prescriptions. Compounded drugs are not FDA-approved, which means FDA has not reviewed them for safety, effectiveness or quality before they are sold, as explained in FDA's compounding questions and answers. Sermorelin is not among the six peptides covered by the federal enforcement discretion policy announced in October 2026, and sellers' claims about its legal status are not consistent. Vials sold online as research chemicals are a different and riskier category altogether.

What the Evidence Shows

In Children With Growth Hormone Deficiency

Geref increased growth rates in children with growth hormone deficiency, but it was less effective than growth hormone injections, which became the standard treatment. That, not safety, is largely why it faded from use.

For Anti-Aging, Muscle and Fat Loss in Adults

Growth hormone naturally declines with age. Small, short studies in older adults found that sermorelin can raise growth hormone and IGF-1 levels, with mixed and modest changes in lean mass and well-being. There are no large, long-term trials showing that sermorelin improves strength, function, quality of life or longevity in healthy adults.

Higher growth hormone in adults without a true deficiency has not been shown to make people healthier and can cause harm, a theme covered on our peptide therapy page. For muscle loss with aging, resistance training and enough protein have the strongest evidence, as our article on sarcopenia explains.

Risks and Side Effects

Short-term side effects include injection site reactions, flushing, headache and dizziness. Raising growth hormone can also cause fluid retention, joint pain, carpal tunnel symptoms and higher blood sugar. Because growth hormone and IGF-1 promote cell growth, people with active cancer or a history of cancer should not use growth hormone-raising peptides.

With compounded and online products, quality is its own risk. The amount of active ingredient, its purity and the sterility of the vial are not independently verified. Contaminated injections can cause serious infections.

What We Recommend Instead

Fatigue, weight gain, low energy and poor sleep usually have treatable causes. Before considering any hormone or peptide, we look for thyroid disease, low testosterone, anemia, depression, sleep apnea, medication side effects and blood sugar problems. Many of these show up on a standard blood panel at our in-office lab.

True adult growth hormone deficiency, usually from pituitary disease, surgery or radiation, is diagnosed with stimulation testing by an endocrinologist and treated with FDA-approved growth hormone. The only FDA-approved drug in the GHRH class today is tesamorelin, for one narrow use.

Sermorelin Compared With Other Growth Hormone Peptides

Sermorelin is often sold in "stacks" with other peptides that raise growth hormone. They differ in how they work and in where they stand with FDA:

• Tesamorelin (Egrifta): a longer-acting GHRH analog and the only one with current FDA approval, limited to excess abdominal fat in adults with HIV-associated lipodystrophy.
• CJC-1295: a long-acting GHRH analog that is not FDA-approved for any use. FDA moved it off its significant-safety-risk compounding list between 2024 and April 2026 after the nomination was withdrawn, and said that removal does not make it eligible for compounding.
• Ipamorelin, GHRP-2 and GHRP-6: act on a different receptor, the ghrelin receptor. None is FDA-approved. GHRP-2 and GHRP-6 remain on FDA's list of substances that may pose significant safety risks in compounding, as does ipamorelin for outsourcing facilities.
• Ibutamoren (MK-677): a pill rather than a peptide, also on that safety-risk list, and shown in a trial in older adults to raise blood sugar.

Combining these products multiplies the uncertainty, because none of the combinations has been tested for safety. If your goal is more energy, better body composition or healthier aging, a physician can usually point you to approaches with stronger evidence.

Talk With a Physician

If you are using sermorelin from another clinic or considering it, our internists will review the product, your labs and your goals without judgment. To discuss your options, schedule a visit.