Ipamorelin vs Hexarelin: Comparing Two Synthetic Peptide GH Secretagogues

Last updated: May 2026

TL;DR: Ipamorelin and Hexarelin are both synthetic peptide growth hormone secretagogues but chemically distinct: Ipamorelin is a pentapeptide (5 amino acids, MW 711.85 g/mol), Hexarelin is a hexapeptide (6 amino acids, MW 887.04 g/mol). Both are used in research applications involving GH-axis pharmacology. They are not interchangeable in research contexts. This guide compares specifications, research-context profile, and reseller considerations side-by-side.

Side-by-side specifications

What’s the same

Both compounds belong to the same broad research category: synthetic peptide GH secretagogues: and share several practical characteristics:

• Both are short synthetic peptides (5 or 6 amino acids)
• Both use modified amino acids (D-amino acids, non-natural residues like Aib in Ipamorelin and D-2-methyl-Trp in Hexarelin) that distinguish them from natural sequences
• Both ship as lyophilized powder in standard 2 mg and 5 mg pack sizes
• Both are sold under standard research-use-only labeling
• Both have analytical specifications (99%+ HPLC, MS-verified identity, COA per batch) that are identical across the PeptideDropship catalog

What’s different

The chemistry diverges meaningfully:

• Length and weight: Hexarelin has one more amino acid and is roughly 175 g/mol heavier than Ipamorelin
• Sequence: Despite both being short synthetic GH secretagogues, the sequences share no residues in common: they are chemically independent compounds
• Modified residues: Ipamorelin uses Aib (aminoisobutyric acid) at the N-terminus and D-amino acids at positions 3 and 4. Hexarelin uses D-2-methyl-Trp at position 2: a different style of structural modification
• Research literature: Hexarelin has been studied since the 1990s and has the larger accumulated academic literature; Ipamorelin entered published research slightly later

Often-paired peptides in research stacks

Both Ipamorelin and Hexarelin are commonly stocked alongside the GHRH analogs (Sermorelin, CJC-1295, Tesamorelin) because research-peptide buyers often investigate the GH-axis pharmacology research literature across multiple compound classes. A reseller carrying GH secretagogues typically also carries at least one GHRH analog. See the GHRH analog comparison for that family.

Reseller considerations

Many resellers stock Ipamorelin first because customer searches are more frequent. Adding Hexarelin makes sense once the catalog already includes one or more GHRH analogs: together they cover both the secretagogue and releasing-hormone-analog research categories.

Sourcing and quality standards (same for both)

• 99%+ purity verified by reverse-phase HPLC
• Molecular weight confirmed by mass spectrometry on every batch
• Third-party Certificate of Analysis (COA) with every batch
• US-based fulfillment with Same-Day shipping
• White-label and private-label options available
• No minimum order quantity

FAQ

Are Ipamorelin and Hexarelin interchangeable in research?

No. They are chemically distinct compounds with different sequences and different documented research profiles. They serve as research tools in related but distinct research questions; both should be available if your research context requires GH-secretagogue comparison.

Which sells more in the research peptide reseller market?

Ipamorelin typically has higher unit-order volume because customer awareness is broader. Hexarelin is a more specialized addition that often gets ordered by partners who already stock Ipamorelin.

Are the storage requirements the same?

Yes. Both are stored lyophilized at −20°C and at 2–8°C after reconstitution. Both are stable in lyophilized form at room temperature for short-duration transit.

How do these compare to Sermorelin or CJC-1295?

Different category. Ipamorelin and Hexarelin are GH secretagogues: they’re modeled on natural ghrelin-family signaling. Sermorelin and CJC-1295 are GHRH analogs: they’re modeled on the GHRH 1-29 sequence. The two categories are studied in different research contexts. See the GHRH analog comparison for context on that family.

Where to go from here

For full specifications on each, see the dedicated wholesale pages: Ipamorelin wholesale and Hexarelin wholesale. For the related GHRH analog family, see the GHRH comparison. Browse the full wholesale catalog for all 105+ lyophilized research peptides.

These statements have not been evaluated by the FDA. Supplied strictly for in-vitro laboratory research and analytical reference use. For research purposes only: not for human or veterinary use. PeptideDropship sells research-grade peptides exclusively to verified B2B partners under research-use-only labeling.