Growth hormone peptides and body composition
Growth hormone secretagogues are peptides that stimulate the body's own pulsatile GH release rather than supplying synthetic HGH. The result is improved sleep depth, body composition (reduced visceral fat, modest lean-mass gain), recovery, and skin elasticity over a 3 to 6 month protocol. Rx Peps Direct (RxPepsDirect.com) prescribes the most-studied GH secretagogues for indicated patients.
- GH secretagogues preserve the natural pulsatile release pattern. Synthetic HGH does not.
- Sermorelin, CJC-1295, and tesamorelin all act at the GHRH receptor with different half-lives.
- Ipamorelin acts at the ghrelin receptor without raising cortisol or prolactin (the cleanest secretagogue).
- WADA prohibits GH secretagogues for elite competitive sport. Recreational and clinical use under prescription is unaffected.
CJC-1295/Ipamorelin
$100/10mg+10mgThe gold standard growth hormone secretagogue stack for lean muscle and recovery.
Sermorelin
$80/15mgA GHRH analog that stimulates your pituitary to produce more growth hormone naturally.
Sermorelin/Ipamorelin
$100/15mg+18mgCombined GHRH + ghrelin mimetic for enhanced growth hormone stimulation.
Tesamorelin
$100/15mgFDA-studied GHRH analog known for reducing visceral fat and improving body composition.
Tesamorelin High-Dose
$200/24mgConcentrated tesamorelin for advanced users on extended protocols.
Tesamorelin/Ipamorelin
$120/12mg+6mgPremium GH secretagogue combination for maximum visceral fat reduction and body recomposition.
Ibutamoren (MK-677)
$1.65/capAn oral growth hormone secretagogue that increases GH and IGF-1 through the ghrelin pathway.
Ibutamoren (MK-677) 25mg
$2.65/capIbutamoren at the higher 25mg capsule strength, for patients stepping up from 12.5mg on their provider's advice.
SLU-PP-332
$3.00/capRetired. The lab that created SLU-PP-332 reports it is not orally bioavailable, and the only form we sold was an oral capsule.
SLU-PP-332/BAM-15 Capsules
$3.50/capRetired. Half of this capsule was SLU-PP-332, which its developers report is not orally bioavailable.
Comparing growth hormone peptides
All GH-class peptides Rx Peps Direct prescribes, with mechanism and dosing context.
| Sermorelin | CJC-1295/Ipamorelin | Sermorelin/Ipamorelin | Tesamorelin | MK-677 | |
|---|---|---|---|---|---|
| Mechanism | GHRH analog (short half-life) | GHRH + ghrelin agonist | GHRH + ghrelin agonist | GHRH analog (long half-life) | Oral ghrelin agonist |
| FDA history | Approved as Geref (1997) | Compounded only | Compounded only | Approved as Egrifta (2010) | Investigational |
| Dosing | 0.6 mg subq nightly | 0.4 mg of each, nightly | 0.5 mg of each, nightly | 1-2 mg subq daily | 10-25 mg oral nightly |
| Best for | Gentle, natural-style GH support | Body composition + sleep | Stronger GH pulse without DAC | Visceral adiposity, lipodystrophy | Patients avoiding injections |
| Starting price | $80 / 15 mg | $100 / blend | Per provider | Per provider | Per provider |
What to expect on a GH peptide protocol
Sleep depth improves first, often within 2 weeks. Body composition changes (reduced visceral fat, increased lean mass) appear at 8 to 12 weeks. Skin elasticity and recovery markers improve over the same window. IGF-1 baseline and follow-up labs are the most reliable measure of response. Most protocols run 3 to 6 months, with breaks before continuing. Avoid protein-heavy meals 2 hours before the bedtime dose; food blunts the GH pulse.
Important Safety Information
- •Active cancer or history of cancer (AUTO-DENY)
- •Diabetic retinopathy
- •Active carpal tunnel syndrome (flag)
- •Pregnancy
- •Pituitary tumor history (AUTO-DENY)
- •Current use of insulin-like medications without provider review
Frequently asked questions about muscle growth & body composition peptides
- What is the best peptide for muscle growth and recovery?
- There is no single best peptide. CJC-1295 with Ipamorelin is the most popular GH-secretagogue stack because the dual mechanism produces a stronger pulse than either peptide alone. Sermorelin plus Ipamorelin is a shorter-acting alternative that more closely mimics natural release. Tesamorelin is FDA-approved (as Egrifta) and has the strongest evidence base for visceral-adiposity reduction. Your provider sets the protocol based on your goals and IGF-1 baseline.
- How long do peptide muscle stacks take to work?
- Sleep improvements are often noticeable within 2 weeks. Body composition changes appear at 8 to 12 weeks of consistent dosing. Strength and recovery improvements typically build through the first 12 to 16 weeks. IGF-1 lab follow-up at 8 to 12 weeks confirms whether the protocol is producing the expected biochemical response.
- Is sermorelin better than CJC-1295 for muscle building?
- Sermorelin has a shorter half-life and more closely mimics natural pulsatile GH release. CJC-1295 has a longer half-life (especially the DAC variant) and produces sustained GH elevation. CJC-1295 paired with Ipamorelin typically produces stronger body-composition results in active patients. Sermorelin is often preferred for older patients seeking a gentler, more natural-style protocol.
- Do GH peptides increase testosterone?
- GH secretagogues do not directly increase testosterone. They act on the pituitary GH axis, not the HPG axis. Some patients report subjective improvements in libido and energy that are typically attributed to better sleep and improved body composition, not testosterone elevation. If testosterone optimization is the goal, ask your provider about TRT separately.
- Are growth hormone peptides legal?
- GH peptides dispensed under a 503A patient-specific prescription written by a licensed provider are legal in every U.S. state where the prescriber is licensed. WADA prohibits all GH secretagogues for elite competitive sport (Olympic, NCAA-tested events, many professional leagues). Recreational and clinical use under prescription is not affected by WADA's ban; the ban only applies to athletes subject to anti-doping testing.
Protocol guides for muscle growth & body composition
Clinical guides covering the molecules in this category. Mechanism, dosing, evidence, and what the research does not yet support.
GHRH analog (GRF 1-29)
Sermorelin protocol guide: pharmacology, dosing, IGF-1 monitoring, and the non-responder reality
The only GHRH analog still Category 1 compoundable. Daily injection, 6 to 12 month protocol, 30 to 40 percent non-responder rate, and IGF-1 the biomarker that decides the answer.
GHRH analog (FDA-approved as Egrifta)
Tesamorelin protocol guide: visceral fat reduction, dosing, and Phase III evidence
The only GHRH analog with Phase III trials and an FDA approval. Visceral fat reduction, the 31 percent non-responder rate, and what reaccumulates when you stop.
Growth hormone stack
CJC-1295 / Ipamorelin protocol guide: dosing, units-to-mcg, timelines, and the legal pathway
Pulsatility, DAC vs no-DAC, syringe math, the 90-day rule, gray-market purity data, and the 503A pathway. Written for the patient who wants the full picture.
Oral GH secretagogue (MK-677)
Ibutamoren (MK-677) guide: oral ghrelin receptor agonist, water retention, glucose elevation, WADA prohibition
The only oral GH secretagogue. Real GH and IGF-1 elevation. Real water retention. Real fasting-glucose drift. WADA prohibited. Monitoring is mandatory.