Growth hormone peptides are compounds that prompt your pituitary gland to release more of its own growth hormone, instead of supplying the hormone directly. Here are six studied examples, with evidence and safety notes, from TelosRX.
Growth hormone peptides get lumped together online as if they're one thing. They aren't. Some mimic one natural signal, some mimic another, and one isn't even a peptide.
This list breaks down six of the most discussed options. For each, you'll get what it is, what research actually measured, and where the caution flags sit.
A quick note before the list. Most of these compounds are not FDA-approved, and several now face FDA compounding restrictions. Any peptide protocol is subject to medical approval by a licensed provider.
How Growth Hormone Peptides Work
Your pituitary releases growth hormone (GH) in pulses, mostly during deep sleep. GH then signals the liver to make IGF-1, a growth factor that acts on muscle, bone, and fat.
Growth hormone peptides nudge that system through two main doors:
- GHRH analogs (hormone-releasing mimics): copy the brain's "release GH" signal. Examples: sermorelin, CJC-1295, tesamorelin.
- Ghrelin mimetics (hunger-hormone copies): hit a separate receptor that also triggers GH release. Examples: ipamorelin, GHRP-2, GHRP-6, MK-677.
Because they work upstream, your body's feedback loops stay partly in play. That's the key difference from injecting synthetic HGH directly.
1. Ipamorelin
Ipamorelin is a five-amino-acid ghrelin mimetic. It's known for being selective, meaning it mainly releases GH without pulling other hormones along.
In the original 1998 animal study, ipamorelin didn't raise ACTH or cortisol beyond levels seen with natural GHRH stimulation. That held even at very high doses. Older peptides like GHRP-6 did raise those stress hormones.
Caution flag: that selectivity data comes from rats and pigs, not people. The FDA has also placed ipamorelin on its list of substances that may pose significant compounding safety risks. For a head-to-head, see ipamorelin vs sermorelin.
2. CJC-1295
CJC-1295 is a longer-lasting GHRH analog. The version with "DAC" (a drug-binding add-on) latches onto blood proteins, so it lingers for days.
A 2006 study in healthy adults found one injection raised GH 2- to 10-fold for six days or more. IGF-1 rose 1.5- to 3-fold for 9 to 11 days. The estimated half-life was 5.8 to 8.1 days.
Caution flag: those were short trials of about a month. FDA material notes reports of increased heart rate and vasodilation reactions. It's often paired with ipamorelin, covered in our CJC-1295 and ipamorelin stack research.
3. Sermorelin
Sermorelin is a shortened copy of natural GHRH, the first 29 amino acids. It's one of the oldest and most studied options on this list.
It has an unusual history. Sermorelin was once FDA-approved and sold as Geref. The maker discontinued it, and the FDA later determined the withdrawal wasn't for safety or effectiveness reasons.
Caution flag: sermorelin is no longer an FDA-approved commercial product. Compounded versions are not FDA-approved. Its short half-life means it acts briefly, much like the body's own pulses.
4. Tesamorelin
Tesamorelin is a stabilized GHRH analog, sold as Egrifta. It's the only drug on this list with a current FDA approval.
That approval is narrow. Egrifta is indicated to reduce excess abdominal fat in adults with HIV-associated lipodystrophy (abnormal fat redistribution). It isn't approved for general anti-aging or body composition goals.
Caution flag: use outside that indication is off-label. Learn more in our tesamorelin research guide.
5. GHRP-2 and GHRP-6
GHRP-2 and GHRP-6 are earlier ghrelin mimetics. They release GH strongly but less cleanly than ipamorelin.
- GHRP-6: also raised ACTH and cortisol in that study, and is widely linked to hunger.
- GHRP-2: raised ACTH and cortisol (stress hormones) in the same 1998 animal study.
Caution flag: both sit on the FDA's list of bulk substances that may present significant safety risks. The FDA cites reports of serious adverse events for GHRP-2, while noting causality hasn't been established.
6. MK-677 (Ibutamoren)
MK-677 is the odd one out. It's an oral pill, and technically not a peptide at all. It mimics ghrelin and raises GH and IGF-1 around the clock.
A two-year trial in older adults, published in the Annals of Internal Medicine, found higher GH and IGF-1 and some gain in fat-free mass. It also reported increased appetite, higher fasting glucose, and lower insulin sensitivity. Strength and function didn't change.
Caution flag: the FDA lists a potential heart failure signal for ibutamoren. That's why many clinicians approach it carefully. Our MK-677 side effects Q&A covers more.
Growth Hormone Peptides Compared
| Compound | Class | How it's given | FDA status | Main caution |
|---|---|---|---|---|
| Ipamorelin | Ghrelin mimetic | Injection | Not approved; compounding risk list | Human data limited |
| CJC-1295 | GHRH analog | Injection | Not approved | Heart rate, flushing reports |
| Sermorelin | GHRH analog | Injection | Formerly approved; compounded versions not approved | Short-acting |
| Tesamorelin | GHRH analog | Injection | Approved for HIV lipodystrophy fat only | Narrow indication |
| GHRP-2 / GHRP-6 | Ghrelin mimetic | Injection | Not approved; compounding risk list | Cortisol, appetite |
| MK-677 | Oral ghrelin mimetic | Pill | Not approved; compounding risk list | Blood sugar, heart failure signal |
Who Should Be Cautious With Growth Hormone Peptides
Raising GH and IGF-1 isn't neutral. Talk with a provider before considering any of these if you:
- Have diabetes, prediabetes, or insulin resistance
- Have a history of cancer, since IGF-1 is a growth signal
- Are pregnant, breastfeeding, or planning pregnancy
- Compete in tested sports, where these compounds are prohibited
- Have heart failure or fluid-retention issues
Where TelosRX Fits
TelosRX is an online-first, asynchronous telehealth service. You complete an intake on your schedule, and a licensed provider reviews it. Not every compound on this list is something TelosRX offers, since availability follows current FDA compounding rules.
If your real goal is energy, recovery, or body composition, a provider can map the options that fit. Explore TelosRX recovery and hormone-aware care pathways, all subject to provider review.
Frequently Asked Questions
Are growth hormone peptides the same as HGH?
No. HGH is the growth hormone itself, given directly. Growth hormone peptides signal your pituitary gland to release more of its own hormone. Because they work upstream, some natural feedback control remains. That doesn't make them risk-free, and most have far less human research than synthetic HGH. A licensed provider can explain the tradeoffs for your situation.
Are growth hormone peptides FDA-approved?
Mostly not. Tesamorelin, sold as Egrifta, is FDA-approved for one narrow use: reducing excess abdominal fat in adults with HIV-associated lipodystrophy. Sermorelin was approved in the past but is no longer marketed. Ipamorelin, CJC-1295, GHRP-2, GHRP-6, and MK-677 are not FDA-approved, and several face FDA compounding safety restrictions.
Are growth hormone peptides banned in sports?
Yes. The World Anti-Doping Agency prohibits growth hormone secretagogues, GHRPs, and GHRH analogs such as CJC-1295 at all times, in and out of competition. If you compete in a tested sport, using any of these compounds can lead to sanctions. Check your sport's rules and talk with a provider before considering them.
Are peptides the same as steroids?
No. Anabolic steroids are synthetic versions of testosterone that act on androgen receptors. Growth hormone peptides are short amino acid chains that act on the pituitary to release growth hormone. They work through different pathways and carry different risks. Both categories can still cause side effects, and both call for medical oversight rather than guesswork.
Do growth hormone peptides affect blood sugar?
They can. Growth hormone naturally opposes some of insulin's effects. In a two-year trial of MK-677 in older adults, fasting glucose rose and insulin sensitivity fell. That's why people with diabetes or prediabetes need careful medical review before considering any compound that raises growth hormone or IGF-1 levels.
TelosRX is LegitScript-certified. Compounded medications are not FDA-approved and are prepared under federal compounding regulations. Approval is subject to evaluation by a licensed provider; approval is not guaranteed. Individual results vary. TelosRX operates as an online-first, asynchronous telehealth service.
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