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MuscleLimited human evidence

Hexarelin

Synthetic hexapeptide growth-hormone secretagogue developed in the 1990s. Stimulates GH release potently in short-term human studies. Concerns about tachyphylaxis (tolerance) with chronic use have limited clinical development.

Educational only — not medical advice. SmartPeptide does not prescribe, diagnose, or treat. Always consult a licensed healthcare provider before using any peptide, supplement, medication, or protocol.

What the research shows

1990s/2000s short-term studies show robust GH/IGF-1 elevation in healthy adults. Some research interest in cardiac protection (preclinical). No modern Phase 3 trials in humans. Not pursued to FDA approval.

What's still experimental

Tachyphylaxis management, optimal cycling protocols, long-term safety, and any modern indication-specific human RCTs.

Anecdotal / community reports

Bodybuilding and 'optimization' communities use hexarelin in cycles. Reports of strength/recovery improvements are uncontrolled and confounded by other interventions.

Anecdotal reports are NOT scientific evidence. They reflect personal experience and may not generalize.

FDA approval status

Source: openFDA + DailyMed (NIH/NLM)
No FDA-approved drug label exists for “Hexarelin”. This peptide is not currently approved by the FDA as a finished pharmaceutical product. Any commercial product claiming FDA approval should be treated with suspicion.

Doses studied in research

No established dose range

What published trials tested or FDA-approved labels specify. Reporting research facts — not a SmartPeptide recommendation.

No FDA-approved or established trial dose range for this peptide. Anecdotal ranges discussed in community forums exist but are not supported by published clinical trials, and SmartPeptide will not publish unverified doses.

This is the honest answer for peptides like BPC-157, IGF-1 LR3, MOTS-c, Epitalon and similar research compounds — robust human dose- ranging studies have not been published. Always work with a licensed clinician familiar with experimental peptides if you are considering any use.

FDA enforcement & recalls

Live · openFDA Drug Enforcement API
No FDA enforcement actions (recalls, market withdrawals, safety alerts) on record for “Hexarelin”. This is the expected baseline for most peptides — the absence of recalls does NOT imply general safety, only that no formal FDA enforcement has been initiated against approved formulations.

Mechanism & targets

ChEMBL · UniProt · Open Targets

Molecule (ChEMBL)

View on ChEMBL
Formula
C59H72N14O9

Live research

PubMed · ClinicalTrials.gov · Europe PMC · OpenAlex
PubMed papers
312
total
Human studies
0
MeSH: humans
Clinical trials
0
published
Active trials
0
0 total registered

Europe PMC — 562 additional records

Includes EU/UK studies and PubMed Central full-text articles. Often surfaces research weeks before PubMed indexes it.

Research volume (OpenAlex topic graph)

Total works
1,174
all years
Last 5 years
233
recent activity
Open access
865
freely readable
OA share
74%
of all works

Human clinical evidence

Semantic Scholar · AI TLDRs · influence-ranked
Total indexed
359
all human + lab studies
Meta-analyses
0
highest evidence
Systematic reviews
0
quality-weighted
Clinical trials
0
published RCTs etc.

Most influential human studies

Ranking blends meta-analysis > systematic review > clinical trial weight with influential-citation count and recency. AI TLDRs by Semantic Scholar / Allen Institute for AI.

Research funding & verification

NIH RePORTER · CrossRef DOI registry

NIH-funded research

U.S. National Institutes of Health
Funded projects
8
all years
Top award sum
$2.6M
aggregate USD
Years covered
12
research span
Largest active / recent grants

Publication landscape

CrossRef · DOI registry
Indexed works (CrossRef)
208
all DOIs registered
Retracted papers
0
no retractions on record
Top funders of indexed research
  • University of Queensland3 works
  • National Health and Medical Research Council3 works
  • Università degli Studi di Milano-Bicocca2 works
  • National Natural Science Foundation of China2 works
  • Ministero dell’Istruzione, dell’Università e della Ricerca2 works
  • Australian Postgraduate Award2 works

Funder diversity is a credibility signal. Research concentrated in a single drug company's funding warrants more scrutiny than research funded across NIH, charities, and academic grants.

Preprints — cutting edge

bioRxiv · medRxiv · via Europe PMC

Preprints have NOT been peer-reviewed. They are early research shared by authors before formal validation. Treat findings as preliminary.

Showing 2 of 2 preprints indexed by Europe PMC.

Known risks

Tachyphylaxis (diminishing response with continued use) is well-documented. Theoretical cortisol and prolactin elevation. Cardiac effects (mostly positive in animal models) but human data is sparse. Source quality is a major concern — no FDA-approved formulations.

Reported side effects

Injection-site reactions, transient flushing, mild dizziness, possible water retention. Long-term effects poorly characterized in modern trials.

FDA adverse event reports (FAERS)

Updated quarterly by FDA
Reports filed
1
FAERS, all years
Serious reports
0
0% of reports
Top reporting countries
  • US1

Most-reported reactions

  • Insomnia
    1
  • Night Sweats
    1

Counts from FDA Adverse Event Reporting System (FAERS). Voluntary reports — they show what was reported, not whether the drug caused the event. Many reports lack confirmation. FAERS docs

What requires medical supervision

Not FDA-approved for any indication. Discuss with a clinician familiar with experimental peptides before considering. Source purity verification is essential.

Questions for your clinician

  • Are there evidence-based alternatives (sermorelin, tesamorelin) that would address my goal?
  • How would we monitor for tachyphylaxis and metabolic side effects?
  • What's the exit criteria?

Editorially curated references

Discussions about Hexarelin

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