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Research Comparison

IGF-1 LR3 vs Kisspeptin

IGF-1 LR3 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
ClassRecombinant 83-residue protein analogue of IGF-1Decapeptide (Kisspeptin-10), KISS1 gene product fragment
Molecular weightNot specified1302.5 g/mol
CAS numberNot assigned / not specifiedNot assigned / not specified
Purity spec≥99%≥99%
Research areasHormonal & Endocrine, Metabolic, MusculoskeletalReproductive, Hormonal & Endocrine
Primary diluentDilute acetic acid (0.1 M) or 10 mM HCl — required for initial dissolutionBacteriostatic water (0.9% benzyl alcohol)
Working windowShort: commonly worked with within 1–2 weeks at 2–8 °C, or frozen in single-use aliquots.Commonly worked with for 2-3 weeks at 2-8 °C, shorter if exposed to light.
Lead degradation routeDenaturation and aggregation — the dominant failure mode, and one that has no equivalent in short unstructured peptides.Tryptophan oxidation, accelerated by light — the characteristic route for this sequence.
Freeze–thawSingle-use aliquots are the standard practice, and here it genuinely matters. IGF-1 LR3 has tertiary structure to lose — unlike the unstructured short peptides in this catalogue, it can denature, and denaturation is not reversible on rewarming.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 LR3 is recombinant 83-residue protein analogue of igf-1, 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 (0.1 m) or 10 mm hcl — required for initial dissolution versus bacteriostatic water (0.9% benzyl alcohol)); their leading degradation routes differ (denaturation and aggregation for IGF-1 LR3, 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 LR3 — origin

IGF-1 LR3 is an engineered analogue carrying two changes to native IGF-1: an arginine substitution at position 3 and a 13-residue N-terminal extension. The Arg3 substitution is the functional one — it drastically reduces binding to IGF binding proteins, which normally sequester the great majority of circulating IGF-1. The result is a molecule that stays free rather than bound.

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 LR3 research themes

IGFBP evasion

The Arg3 substitution reduces binding-protein affinity, which is the entire design rationale.

Cell proliferation

Widely used in cell-culture research as a growth-factor supplement.

Satellite cell activation

Studied in muscle-biology research models.

PI3K/Akt signalling

The canonical downstream pathway examined in IGF-1 receptor research.

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 LR3 handling

  • Dissolve in dilute acetic acid or dilute HCl FIRST; do not attempt direct dissolution in water or PBS.
  • Add carrier protein (e.g. 0.1% BSA) for storage of dilute solutions to prevent adsorptive loss.
  • Prepare single-use aliquots — freeze–thaw denaturation is irreversible.
  • Do not vortex; agitation denatures folded proteins at the air–liquid interface.

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 LR3 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 LR3 reference

Full IGF-1 LR3 reference IGF-1 LR3 storage IGF-1 LR3 reconstitution IGF-1 LR3 calculatorIGF-1 LR3 product details

Kisspeptin reference

Full Kisspeptin reference Kisspeptin storage Kisspeptin reconstitution Kisspeptin calculatorKisspeptin product details

Related comparisons

5-Amino-1MQ vs IGF-1 LR3BPC-157 vs IGF-1 LR3CJC-1295 (No DAC) vs IGF-1 LR3CJC-1295 (No DAC) vs KisspeptinCJC-1295 + Ipamorelin vs IGF-1 LR3CJC-1295 + Ipamorelin vs KisspeptinIGF-1 LR3 vs IpamorelinIGF-1 LR3 vs MOTS-C

IGF-1 LR3 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.