WHAT CHANGED IN THE STUDIES
A higher blood hormone level doesn’t prove better health
Blood tests checked hormones. Other studies checked fat or growth. Your health needs more than a blood rise; an axis means hormones working together.
CJC-1295 kept blood levels high
Healthy adults had lasting rises in blood hormones. The longer acting form stayed in blood longer. The studies didn’t prove better health.
Check the lasting blood changes ›
Sermorelin helped children grow
Children with too little growth hormone grew faster. That finding can’t tell you whether healthy adults will sleep better or lose fat.
Check the childhood findings ›
Tesamorelin lowered deep belly fat
Adults who have HIV lost fat around organs inside the belly. That result doesn’t predict general weight loss for you.
Check whose fat changed ›
Ipamorelin didn’t prove faster eating
Patients recovering from bowel surgery had no proven benefit. A separate study found a brief hormone rise. Animal findings remain separate.
Check the bowel surgery result ›The quick answer is a blood rise, growth or fat loss
Scientists checked hormone levels, body fat and how fast children grew. CJC-1295, sermorelin, tesamorelin and ipamorelin can all raise growth hormone. A higher blood reading doesn't prove that someone felt better. Each drug needs evidence for the benefit that matters to you.
Some blood results tell how much higher the final reading was. Other results give the rise as a percent of the starting level. Fat studies used scans or weighed fat and other body tissue. The person studied matters as much as the size of the change.
A reading twice as high means the blood level doubled. A scan can show less fat without showing lower body weight, because square centimeters describe the area of fat seen in a scan while kilograms describe how much tissue weighs. Those different changes cannot be added to make one health result.
The numbers come from published papers listed with the study findings. A brief blood test cannot answer a question about years of health. A childhood growth result cannot predict your sleep or energy. None of these findings tells you how much to take.
Blood tests don’t measure how much fat someone lost
Growth hormone supports growth and helps your body use food. The liver makes another hormone that supports growth called insulin-like growth factor 1, or IGF-1. Blood tests can measure both hormones, but don't measure sleep or strength. Those benefits need tests of how people feel and function.
Growth hormone levels change through the day. A test between bursts can show a very low level, while an overnight average includes those low readings along with the high readings during bursts, so the results describe different things. A single test and an overnight average therefore answer different questions.
In healthy adults, CJC-1295 raised blood hormones while bursts continued [4][5]. The blood level between bursts rose from a low starting point. The average rose too, but included the already higher levels during bursts. You can have higher levels without having more bursts during the night.
Tesamorelin trials used scans to measure fat around organs inside the belly. Other tests checked liver fat and tissue apart from fat [12][14]. That tissue includes muscle and bone, so added weight doesn't mean added muscle alone. A smaller fat area doesn't tell you the percent lost unless the starting fat area is known.
The same growth hormone can lead to different results
Peptides consist of joined amino acids, the tiny pieces that make proteins. Some peptides act as hormones, which carry instructions through your blood. Sermorelin, tesamorelin and CJC-1295 copy a hormone that starts growth hormone release. Ipamorelin starts that release through the body's appetite hormone instead.
The pituitary gland sits just beneath your brain. Several hormones, including growth hormone, come from this gland. A review explains how these hormones work together to control growth [1]. Knowing that a drug raises growth hormone doesn't tell you whether you'll feel better.
The studies included healthy adults, children with low hormone levels and adults who have HIV. Some adults who have HIV had unusual fat buildup inside the belly. Animals took part in other studies, with quite different health problems. Results in those animals cannot predict your own response.
Tesamorelin has an approved use for that specific fat problem with HIV. CJC-1295 and ipamorelin have no approved use in people. Sermorelin's earlier approved product left the market; pharmacies can prepare prescriptions today. That doesn't give sermorelin approval to improve sleep, energy or aging in adults.
The drug and the people studied belong with the result
CJC-1295 raised blood hormones in small studies of healthy adults [3][4][5]. Scientists checked low readings, overnight averages and how long the rises lasted. Sermorelin research tested a man-made copy of part of a natural hormone [11]. Doctors' views and tests of another drug give different evidence [8][9][10].
Tesamorelin trials measured body fat and blood hormones [12][14][15][16]. The main fat findings came from adults who have HIV and excess deep belly fat. Tests also checked liver fat and the weight of muscle, bone and other tissue. Those changes don't establish weight loss for everyone who wants to lose weight.
Ipamorelin has a small human study of a brief hormone rise [20]. A trial after bowel surgery didn't prove that patients could eat sooner [19]. Other studies involved rats or ferrets, including rats receiving another drug [17][18][21]. Animal findings don't supply the missing proof of benefit in people.
The comparison explains why the largest number may tell you little about health. The papers cited here give the work behind each numbered note. Your concern may be sleep, strength or a problem after years of use, but a short study that only checked blood hormones cannot tell you whether people had those lasting benefits.