Sermorelin raises growth hormone and IGF-1, which your liver makes.
Read what changed in older men and children, how the gland responds, and which questions remain open.
Sermorelin changed blood tests, but proof stops there
The medicine Sermorelin copies part of a hormone the brain makes. This page gives the main study results and shows where proof ends. The drug has 29 amino acids. Your body joins these tiny parts to build proteins. In Sermorelin, the chain copies a request sent to your pea-sized pituitary gland. Sermorelin doesn't contain growth hormone. The drug asks your gland to release the growth hormone stored there [2][3].
That brain message becomes weaker as you age. In a 14-day study, older men's blood tests showed more growth hormone. IGF-1, a later hormone from your liver, increased as well [2]. Both readings came close to those of younger men. That's why the drug drew interest among older adults.
The limit matters. Sermorelin isn't approved as a drug against aging. No study has proved a lasting benefit for adults. A leading medical journal warned that care had moved ahead of proof [5]. You can read personal reports, good and bad, on the effects page.
Sermorelin asks your own gland to make the release
Sermorelin copies the first 29 amino acids from a larger brain hormone [6]. Your body joins amino acids to make proteins. In Sermorelin, this short chain reaches your growth gland and starts growth-hormone release. Sermorelin repeats that call but doesn't supply growth hormone.
The copied hormone reaches the gland's cells [6]. Those cells then release growth hormone briefly. The drug makes the request, while your gland decides how much to send out.
The release can still slow after your body has made enough hormone. IGF-1, a later hormone made in your liver, also helps slow the release [4]. One author argued that this control might make Sermorelin act more like your natural system. The author explained how Sermorelin works but proved neither better health nor greater safety [4].
A Sermorelin peptide study raised two hormones in older men
Peptide means amino acids joined in a small chain. The best-known sermorelin peptide study followed healthy men in later life. Their average age was 68. Researchers checked two blood readings: growth hormone and IGF-1, a later hormone made in your liver. They gave twice-daily shots under the skin: 0.5 mg or 1 mg. After 14 days, the 24-hour growth-hormone reading climbed higher with the larger amount. IGF-1 increased as well [2]. At the larger amount, growth hormone and IGF-1 equaled younger men's readings. Both findings came from blood tests. Fasting blood sugar didn't change [2].
Those results cover blood tests over two weeks. They show that the hormone system can still respond later in life. No result proves that a man will regain his youth or add years to his life. The study tested neither claim, so it doesn't tell what will happen for you. The full sermorelin research page explains those limits.
Children had a firmer result. One daily shot sped growth in young patients unable to make enough growth hormone. Growth was about 4.1 cm/year at first and roughly 7-8 cm/year later. IGF-1 didn't rise too high [1]. That childhood use once had approval; the about page explains what changed.
Your body still controls when the hormone release stops
One brain hormone begins growth-hormone release. Another hormone slows the release once the body has made enough. Sermorelin strengthens the first message but leaves the slowing hormone at work [4].
When Sermorelin reaches your growth gland, its cells release the hormone into your blood [6]. Growth hormone then goes to your liver. Your liver makes IGF-1, a second growth hormone that acts throughout your body [6]. IGF-1 also helps stop further release when enough is present [11].
Growth hormone and IGF-1 rise and fall in brief bursts, often during deep sleep. Neither stays at one steady level. Because Sermorelin works through your gland, one article argued that the usual rise and fall remains [4]. A 2025 review followed these same steps through your brain, gland, and liver [6].
Each page answers a different Sermorelin question
Researchers studied Sermorelin when growth hormone and IGF-1, a later hormone made in your liver, fell with age [2]. Other studies followed children whose growth-hormone supply was low [1]. Tesamorelin, another medicine drawn from the same natural hormone, was tested for fat levels and thinking scores [7]. One article compared how Sermorelin works with giving growth hormone itself [4].
You can take one question at a time. Sermorelin benefits covers changes found in studies. Sermorelin before and after compares the first and last measurements. The Sermorelin effects page begins with risks, then clearly marks personal reports.
A warning from 2008 still matters for you. A leading medical journal judged the evidence too weak for anti-aging care [5]. You can check each numbered source in the Sermorelin references.