Verified July 2026 · Cited to primary sources
Peptides marketed for sleep and circadian support, graded by human evidence and legal status. The named "sleep peptide" (DSIP) is on the July 2026 PCAC docket, and the evidence across this category is old, small, or indirect.
Strongest human evidence in this category
No peptide here has strong human sleep-efficacy data. Epitalon (Grade D) rests on small Russian studies. Sermorelin (Grade B) is better-evidenced overall and sometimes used for sleep and recovery, but it is a GH-axis peptide, not a dedicated sleep aid. The honest answer: sleep is the weakest-evidence peptide category.
How we ranked these
We don't rank by popularity or by what we can sell you. Every peptide below is ordered by the same fixed rubric, and affiliate availability never moves a grade.
A historical FDA survey of compounded drugs found 31% failed standard potency testing. What is actually in the vial is a separate question from whether the compound works, and a rubric like this exists to keep the two apart. See the full A to F methodology →
Stimulates natural pituitary growth-hormone release as the shortest active GHRH(1-29) fragment. The "gentler," physiologic GH-axis peptide.
Sermorelin is legally compoundable (503A) thanks to its prior FDA approval as Geref. Human evidence is Grade B: real historical trial data. It is the best-evidenced GH-axis peptide with a legal supervised route today.
See the evidence →Non-peptide agonist of the ghrelin receptor (GHS-R1a) that mimics ghrelin to drive sustained, roughly physiological increases in growth hormone and IGF-1. Because it is orally bioavailable and long-acting, one daily dose keeps GH/IGF-1 elevated, unlike the injectable peptide GHRPs. That same sustained GH/IGF-1 elevation is what drives its main downside: reduced insulin sensitivity and higher fasting glucose.
The most-studied and only orally-active option in this group, with genuine 2-year human RCT data behind it, which is why it grades C and not D. But the same trial that proves it works also shows the catch: modest lean-mass gain, no functional benefit, and worse insulin sensitivity. Not FDA-approved, research-only, and a poor idea for anyone with blood-sugar concerns.
See the evidence →Claimed to activate telomerase and regulate melatonin/circadian and pineal function. Marketed for longevity and anti-aging.
Epitalon is not FDA-approved and remains under FDA review. On July 24, 2026 the PCAC panel voted 7 to 5 (1 abstention) to recommend adding it to the 503A list for insomnia, but that is advisory and the FDA has not acted. Human evidence is Grade D: the longevity and anti-aging claims rest on small, low-quality Russian studies.
See the evidence →DSIP is a naturally occurring nonapeptide first isolated from rabbit brain during electrically induced sleep. It was proposed to promote delta-wave (slow-wave) sleep and to modulate stress, temperature, and pain, but its receptor, gene, and even its status as a true endogenous sleep factor have never been firmly established. The mechanism remains largely uncharacterized.
DSIP is the only one of the seven peptides the FDA panel reviewed in July 2026 that it declined to recommend, voting 6 to 7 (1 abstention) against adding it to the 503A list on July 24. That is advisory, not a ban, and the FDA has not acted. It is also one of the oldest sleep peptides and one of the least resolved. There are genuine small human studies suggesting it helped insomnia, which is more than most research peptides can claim, but the evidence is thin, decades old, and never replicated at modern standards, and the basic biology is still contested. Interesting history, weak proof. If you try it you are running a personal experiment on 1980s data.
See the evidence →| Peptide | Evidence | Legal & safety | Typical cost | Verdict | |
|---|---|---|---|---|---|
| Sermorelin The "gentler," formerly-FDA-approved GH-axis peptide. It's the best-evidenced option you can still legally get through a compounding pharmacy. | Grade B | See evidenceSee the evidence for Sermorelin | |||
| MK-677 (Ibutamoren) The odd one out: MK-677 is not a peptide, it is an orally-active small-molecule ghrelin mimetic, which is why people take it as a daily capsule instead of an injection. It has the best human evidence in this group by far, including a 2-year randomized trial, but that trial is also the cautionary tale: it raised lean mass a little while measurably worsening insulin sensitivity and blood sugar. | Grade C | See evidenceSee the evidence for MK-677 (Ibutamoren) | |||
| Epitalon A longevity and anti-aging peptide built on small, low-quality Russian studies. The claims far outrun the evidence. | Grade D | See evidenceSee the evidence for Epitalon | |||
| DSIP (Delta Sleep-Inducing Peptide) A nine-amino-acid peptide discovered in the 1970s and named for the deep-sleep brain waves it was thought to trigger. Small old human studies suggested it helped insomnia, but the underlying science stayed so thin that reviewers literally call it an unresolved riddle. | Grade D | See evidenceSee the evidence for DSIP (Delta Sleep-Inducing Peptide) |
Reading this table: Evidence is the A to F human-proof grade; Legal status and Safety are separate factual badges; Verdict is our honest one-line take. Affiliate availability never changes a grade. Full methodology.
FAQ
Sleep is the weakest-evidence peptide category. No peptide here has strong human sleep-efficacy data. Epitalon (Grade D) rests on small Russian studies, and DSIP (the so-called "sleep peptide") is on the July 2026 PCAC docket with thin evidence. Sermorelin (Grade B) is better-evidenced overall but is a GH-axis peptide, not a dedicated sleep aid.
DSIP has old, small, and indirect human data, nothing that meets a modern efficacy bar. It is one of the seven peptides under FDA review at the July 23 to 24, 2026 PCAC meeting, and we don't consider its sleep benefits proven.
Sermorelin is legally compoundable through a 503A pharmacy, but it is a growth-hormone-axis peptide, not a dedicated sleep aid. The named sleep peptides (DSIP, Epitalon) have no legal supervised US route and are under or awaiting FDA review.
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