The best peptides for sleep, and why the famous one is not on top
Most peptides marketed for sleep are GH secretagogues taken at bedtime, where the sleep benefit is a side effect of the GH pulse. The one compound literally named for sleep has inconsistent human results. We rank on what is reproducible.
Quick answer
| # | Compound | Class | Evidence | Reported range | Status |
|---|---|---|---|---|---|
| 1 | Sermorelin | GHRH analogs | Regulator approved | 200-500 mcg | Prescription |
| 2 | Ipamorelin | GHRPs & ghrelin mimetics | Preliminary human | 200-300 mcg | Research only |
| 3 | MK-677Not a peptide | GHRPs & ghrelin mimetics | Clinical trials | 10-25 mg | Research only |
| 4 | DSIP | Nootropic & neuro | Preliminary human | 100-300 mcg | Research only |
The ranking
A GHRH analog with a prior FDA approval and documented effects on slow-wave sleep, since GHRH itself promotes it. Bedtime dosing aligns with the natural nocturnal GH pulse. The best-supported option here.
Clean GHRP with no cortisol spillover, which matters at bedtime. Users consistently report deeper sleep; the controlled sleep-architecture data is sparse.
Material for this compound is sold for laboratory research only. It is not manufactured, tested or labelled for human administration.
Oral and long-acting, with human data showing increased slow-wave sleep duration. Not a peptide. The trade-off is daytime lethargy and reduced insulin sensitivity.
Material for this compound is sold for laboratory research only. It is not manufactured, tested or labelled for human administration.
Delta sleep-inducing peptide, named for the rabbit experiment that identified it. Human studies of sleep effects are mixed and often null. It ranks last on a list it is named for, which tells you what the evidence looks like.
Material for this compound is sold for laboratory research only. It is not manufactured, tested or labelled for human administration.
What we left out, and why
Head-to-head comparisons
References for the compounds in this guide
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- Safety and Efficacy of Approved and Unapproved Peptide Therapies for Musculoskeletal Injuries and Athletic Performance.Sports Med 2026.PubMed 41966639 · doi:10.1007/s40279-026-02437-0
- Advances in the detection of growth hormone releasing hormone synthetic analogs.Drug Test Anal 2021.PubMed 34665524 · doi:10.1002/dta.3183
- Sermorelin: a better approach to management of adult-onset growth hormone insufficiency?.Clin Interv Aging 2006.PubMed 18046908 · doi:10.2147/ciia.2006.1.4.307
- The effects of high altitude on hypothalamic-pituitary secretory dynamics in men.Clin Endocrinol (Oxf) 1995.PubMed 7641401 · doi:10.1111/j.1365-2265.1995.tb01887.x
- A new era of doping? Use of peptide and peptide-analog drugs in recreational and professional sport and bodybuilding: a critical review.J Sports Med Phys Fitness 2026.PubMed 41880199 · doi:10.23736/S0022-4707.26.17773-1
- The impact of cranial irradiation on GH responsiveness to GHRH plus GH-releasing peptide-6.J Clin Endocrinol Metab 2002.PubMed 11994347 · doi:10.1210/jcem.87.5.8485
- Outcome of growth hormone therapy in children with growth hormone deficiency showing an inadequate response to growth hormone-releasing hormone.Endocrine 2001.PubMed 11572326 · doi:10.1385/ENDO:15:1:051
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- Pharmacokinetic-pharmacodynamic modeling of ipamorelin, a growth hormone releasing peptide, in human volunteers.Pharm Res 1999.PubMed 10496658 · doi:10.1023/a:1018955126402
- Prospective, randomized, controlled, proof-of-concept study of the Ghrelin mimetic ipamorelin for the management of postoperative ileus in bowel resection patients.Int J Colorectal Dis 2014.PubMed 25331030 · doi:10.1007/s00384-014-2030-8
- Injectable Peptides in Sports Medicine: A Structured Narrative Review of Evidence, Safety, and Antidoping Implications.JBJS Rev 2026.PubMed 42160466 · doi:10.2106/JBJS.RVW.26.00027
- Growth hormone-releasing peptides.Eur J Endocrinol 1997.PubMed 9186261 · doi:10.1530/eje.0.1360445
- MK-677, an orally active growth hormone secretagogue, reverses diet-induced catabolism.J Clin Endocrinol Metab 1998.PubMed 9467534 · doi:10.1210/jcem.83.2.4551
- The Safety and Efficacy of Growth Hormone Secretagogues.Sex Med Rev 2018.PubMed 28400207 · doi:10.1016/j.sxmr.2017.02.004
- Growth hormone-releasing peptides and their analogs.Front Neuroendocrinol 1998.PubMed 9465289 · doi:10.1006/frne.1997.0158
- New directions in growth hormone treatment in children.Pediatr Endocrinol Diabetes Metab 2025.PubMed 41693185 · doi:10.5114/pedm.2025.158544
- Growth hormone-releasing peptides and the cardiovascular system.Ann Endocrinol (Paris) 2000.PubMed 10790589
- Regulation of ghrelin secretion and action.Endocrine 2003.PubMed 14610293 · doi:10.1385/ENDO:22:1:5
- Ghrelin receptor (GHS-R1A) agonists show potential as interventive agents during aging.Ann N Y Acad Sci 2007.PubMed 18056963 · doi:10.1196/annals.1404.023
- Delta sleep-inducing peptide.Eur J Anaesthesiol 2001.PubMed 11437870 · doi:10.1046/j.1365-2346.2001.00917.x
- Neuropeptides and human sleep.Sleep 1997.PubMed 9456470
- Peptides and the blood-brain barrier.Peptides 2015.PubMed 25805003 · doi:10.1016/j.peptides.2015.03.010
Literature retrieved from PubMed on October 16, 2026, favouring human studies and reviews. Numbered markers in the text show which paper supports which statement; uncited entries are background reading.