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Research Comparison

IGF-1 vs Kisspeptin

IGF-1 and Kisspeptin are studied in overlapping research areas, which is why they are frequently compared. This is a neutral side-by-side reference drawn from published preclinical literature and laboratory handling data.

Shared research areas:Hormonal & Endocrine
Class70-residue single-chain protein (native IGF-1), three disulfide bondsDecapeptide (Kisspeptin-10), KISS1 gene product fragment
Molecular weight7648.7 g/mol1302.5 g/mol
CAS numberNot assigned / not specifiedNot assigned / not specified
Purity spec≥99%≥99%
Research areasHormonal & Endocrine, Musculoskeletal, MetabolicReproductive, Hormonal & Endocrine
Primary diluentDilute acetic acid for initial dissolutionBacteriostatic water (0.9% benzyl alcohol)
Working windowShort — days rather than weeks — and shorter still with repeated handling.Commonly worked with for 2-3 weeks at 2-8 °C, shorter if exposed to light.
Lead degradation routeMisfolding and irreversible denaturation — the dominant failure mode.Tryptophan oxidation, accelerated by light — the characteristic route for this sequence.
Freeze–thawPoorly tolerant. Repeated freeze-thaw denatures the folded structure permanently, so aliquot for single use rather than relying on any freeze tolerance.Aliquot on first reconstitution; avoid repeated cycles.
Light sensitivityNo specific light requirement beyond normal practice.Contains tryptophan — keep reconstituted solution out of direct light.

How they actually differ

Comparing the two: IGF-1 is 70-residue single-chain protein (native igf-1), three disulfide bonds, while Kisspeptin is decapeptide (kisspeptin-10), kiss1 gene product fragment — different molecular classes with different handling consequences; they call for different primary diluents (dilute acetic acid for initial dissolution versus bacteriostatic water (0.9% benzyl alcohol)); their leading degradation routes differ (misfolding and irreversible denaturation for IGF-1, tryptophan oxidation, accelerated by light for Kisspeptin), so the storage precautions that matter are not the same; their practical working windows differ once reconstituted. The sections below set out each in full.

IGF-1 — origin

IGF-1 is the native insulin-like growth factor — a folded 70-amino-acid protein stabilised by three internal disulfide bonds. It is the downstream messenger produced after growth hormone acts, and it is handled as a protein rather than a short peptide. This is the native sequence, distinct from the long-acting LR3 analogue.

Kisspeptin — origin

Kisspeptin-10 is the C-terminal decapeptide of the KISS1 gene product, active at the KISS1 receptor (GPR54). It sits at the top of the reproductive signalling axis, studied for triggering GnRH release. The parent protein was first described as a metastasis suppressor, hence the older name metastin.

IGF-1 research themes

IGF-1 receptor signalling

Studied as the native ligand for the IGF-1 receptor and its downstream proliferation and survival pathways.

Satellite cell activation

Examined in muscle research models for its role in satellite-cell behaviour and anabolic signalling.

Native versus analogue

Compared with IGF-1 LR3, whose reduced binding-protein affinity gives a longer active window — a contrast studied directly in the literature.

Kisspeptin research themes

Reproductive axis

Studied as the upstream trigger of GnRH release and the downstream LH and FSH signalling cascade.

KISS1R / GPR54 signalling

Examined as the endogenous ligand for the KISS1 receptor in reproductive neuroendocrine models.

Metastasis-suppressor origin

The parent KISS1 product was first characterised in cancer-metastasis research, a separate strand of the literature.

IGF-1 handling

  • Dissolve first in dilute acetic acid, then dilute into the working buffer — never expect plain water to take it up fully.
  • Use a carrier protein and low-bind labware to prevent adsorptive loss.
  • Aliquot for single use; do not re-freeze reconstituted protein.

Kisspeptin handling

  • Reach room temperature before opening.
  • Keep reconstituted solution out of direct light during long bench sessions.
  • Aliquot and refrigerate.

Both third-party tested

Every Popular Peptides batch of IGF-1 and Kisspeptin is independently tested by HPLC and LC-MS with a published Certificate of Analysis. Enter a lot number to pull the COA for a specific vial.

Verify a batchPublished COAsHow we test

IGF-1 reference

Full IGF-1 reference IGF-1 storage IGF-1 reconstitution IGF-1 calculatorIGF-1 product details

Kisspeptin reference

Full Kisspeptin reference Kisspeptin storage Kisspeptin reconstitution Kisspeptin calculatorKisspeptin product details

Related comparisons

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IGF-1 and Kisspeptin are supplied strictly as research chemicals for in-vitro laboratory and research use only. They are not intended for human or animal consumption, diagnostic, or therapeutic use. This comparison summarizes published preclinical literature and laboratory handling data; it is not medical advice, not a claim of efficacy, and not usage guidance.