Research
Sermorelin research: what growth factor 1 did in people
The strongest human finding comes first, followed by the limits you need to judge it.
What changed in the main Sermorelin studies
The first team made Sermorelin from the useful front of a brain hormone. They hoped the growth gland would respond without ready-made growth hormone.
The children began with too little growth hormone and grew faster on Sermorelin. Their growth factor 1, a liver-made hormone, stayed in the expected range.
Older men's growth factor 1 matched blood results measured in younger men. That finding can't tell whether you would feel better or function better.
A separate drug that stays active longer improved thinking scores and lowered body fat. Those results don't prove Sermorelin helps you, and neither drug was proved to slow aging.
How Sermorelin leads to growth factor 1, then slows
Sermorelin copies a short stretch from a brain hormone [1]. It reaches growth-gland cells, which then release growth hormone [1].
The gland sends that hormone out in bursts [1]. Your liver answers by making growth factor 1, which does much of the growth work.
Somatostatin is a brain hormone that orders the gland to pause. Growth factor 1 adds a second brake when your body has enough [4].
A medical review thought these brakes might avoid too much hormone from ready-made shots [7]. It didn't prove Sermorelin was safer or gave you lasting help.
What Sermorelin changed and what it didn't prove
Did Sermorelin work in children? Daily skin shots raised growth from about 4.1 centimeters per year to roughly 7-8 centimeters per year [2]. Their growth factor 1 stayed in the range doctors expected.
The healthy men in the adult study averaged 68 years of age. They received 0.5 milligrams or 1 milligram twice daily for 14 days.
Researchers drew blood through a full day and added all the growth-hormone readings. The larger study amount lifted that sum and growth factor 1, while fasting blood sugar didn't rise [3].
The growth factor 1 change wasn't shown to improve how the men felt. The child and adult findings also cover only short spans.
A medical journal found no good case for using Sermorelin to slow age [6]. The studies don't show what years of treatment would mean for you.
Which Sermorelin benefits have support in people
Human studies found only a few Sermorelin benefits. At the larger study amount, fourteen days brought growth factor 1 and growth hormone into the young-adult range [3].
Tesamorelin is a different medicine made to keep working longer. Researchers tested it in 152 older adults for 20 weeks.
It raised growth factor 1 by 117% and cut body fat by 7.4% [8]. Thinking scores also improved a small amount, and doctors still called the growth factor 1 result normal.
Chance formed the groups, and some people got a placebo, an empty shot. Neither the staff nor the people knew who got tesamorelin until the study ended.
That made the comparison fair, but tesamorelin isn't Sermorelin. Its thinking and body-fat results don't tell what Sermorelin would do for you [8].
A medical review found no sound long-term proof for claims about slowing age or reshaping your body [6].
Where a Sermorelin prescription comes from in 2025
A 2025 Nature Reviews Endocrinology review synthesizes the biology of growth-hormone-releasing hormone and its analogues across health and disease — GHRH-receptor signaling, the GH/IGF-1 axis, and therapeutic applications of GHRH agonists and antagonists — situating sermorelin within an active research program [9].
Sports-medicine reviews from 2026 are more cautionary. One critical review classifies sermorelin among GHRH-analogue peptides marketed for performance enhancement and reports a largely unregulated supply chain yielding frequently mislabeled or contaminated products [11]. A narrative review explicitly including sermorelin describes a parallel gray market of unapproved compounds where rigorous human safety data are scarce [12], and a structured review concludes GH-axis secretagogues remain investigational with uncertain safety profiles [13]. These are summarized in sermorelin side effects in the literature.
The contrast this site is named for sits exactly here. The gray-market supply those reviews describe has no prescriber in it; the regulated alternative does. In the United States sermorelin now reaches patients as a 503A compounded preparation ordered by a licensed clinician, and licensed telehealth practices are the usual point of entry — Promise Peptides (mypromise.com) is one of them, with clinicians who prescribe sermorelin after reviewing a case and a partner pharmacy that prepares what they order. None of that resolves the anti-aging question this page leaves open. What it resolves is provenance: a labeled strength, a named pharmacy, and a prescriber answerable for the decision.
What Sermorelin may change and what remains open
What happened to people given Sermorelin?
Children short on growth hormone grew faster with daily skin shots [2]. During 14 days, older men had more growth factor 1 and growth hormone [3][6].
That growth factor 1 rise gave no clear gain in the men's daily lives. It also leaves the effects of years unanswered.
When did the blood tests change?
Within hours, one dose lifted growth hormone, and the rise lasted about 3 hours [5]. Growth factor 1 rose during 14 days in older men [3].
Researchers followed tesamorelin, a separate long-lasting medicine, in thinking work for 20 weeks [8]. Those results don't tell what Sermorelin would do for you.
Why does Sermorelin leave before CJC-1295?
Half-life is the time until your blood has lost half the drug. For Sermorelin, it is 10-12 minutes once the drug enters a vein [5].
CJC-1295 is a separate lab-made drug built to remain in blood longer. A longer blood stay doesn't prove less risk for you.
How does ipamorelin start hormone release?
Ipamorelin is another lab-made drug that can prompt growth-hormone release. It copies ghrelin, a stomach hormone that can raise hunger [1].
Ipamorelin attaches to a different receptor, or docking place, on growth-gland cells. An ipamorelin result doesn't tell how you'll answer Sermorelin.
How is Sermorelin unlike a growth-hormone shot?
Sermorelin prompts your gland without adding ready-made growth hormone. The brain's stop hormone and growth factor 1 can still curb the gland [7].
One review thought those brakes might prevent too much hormone. It didn't prove lasting help or less harm for you.
What happened in the tesamorelin thinking test?
Older adults had better thinking scores after 20 weeks [8]. Tesamorelin also raised growth factor 1, but neither result proves that Sermorelin helps you.
Why did researchers give Sermorelin near bedtime?
Deep sleep is when your body sends its biggest growth-hormone burst. Teams placed doses near that burst, but their plan isn't advice for your dose [8].
Did the bedtime timing help or hurt sleep?
The amount of hormone released differed with dose time. The study didn't say whether Sermorelin made your sleep better or worse [8].
Did Sermorelin raise growth factor 1?
Researchers drew blood all day from older men and added their growth-hormone readings. That total and growth factor 1 rose during 14 days [3].
Growth factor 1 rose more at the higher amount. Tesamorelin brought a 117% rise in a 20-week trial, but that won't forecast the number on your test [8].
Did Sermorelin change testosterone?
The studies measured growth hormone and growth factor 1, not testosterone itself [3]. A growth factor 1 change doesn't prove that Sermorelin raises your testosterone.
Did Sermorelin lower fat or body weight?
Tesamorelin cut body fat by 7.4% in a thinking trial [8]. That finding isn't proof that Sermorelin lowers your fat or weight [6].
Did Sermorelin add muscle?
No Sermorelin trial here measured muscle growth. Growth factor 1 helps tissue grow, but that doesn't prove Sermorelin adds muscle for you [8].
How was the tesamorelin thinking trial run?
The trial followed 152 older adults, including 66 with mild thinking trouble, for 20 weeks. Chance placed each person in the drug or placebo group.
The placebo held no drug, and neither the people nor staff knew who got tesamorelin. It improved thinking, raised growth factor 1 by 117%, and cut body fat by 7.4% [8].