peptide different names FAQ

Treat them as referencing the same compound. A 2005 paper citing 'AOD-9604' and a 2018 supplier whitepaper referencing 'AOD9604' are discussing the identical peptide fragment. The naming inconsistency complicates literature searches. PubMed and Google Scholar will return different result sets depending on whether you include the hyphen. But doesn't indicate different molecules. When conducting systematic reviews, search both terms separately and de-duplicate results manually.

Request certificates of analysis for both SKUs and compare the amino acid sequence data. If the molecular weight, HPLC purity, and sequence match exactly. And they should. The supplier is selling the same peptide under two catalogue entries, likely for database or SEO purposes. This isn't fraudulent but it's administratively redundant. Choose whichever listing has the clearer documentation or better unit pricing. If the supplier claims they're functionally different, ask for the specific structural difference in writing. There isn't one.

Proceed without concern. The compounds are identical. The protocol author used the hyphenated format because that's how the original Metabolic Pharmaceuticals literature spelled it, but the peptide's activity doesn't depend on punctuation. Verify that the supplier's product matches the sequence (residues 177–191 hGH) and purity grade (≥95% minimum, ≥98% preferred). If those align, the absence of a hyphen in the product name is irrelevant to experimental outcomes.

Request the amino acid sequence and molecular weight. GHK-Cu has a molecular weight of approximately 340 Da and a sequence of Gly-His-Lys-Cu²⁺. If the supplier cannot provide sequencing data or a certificate confirming copper content by atomic absorption, the product is not research-grade. Generic 'copper peptide' labels occasionally refer to other complexes (like copper-binding domains from larger proteins) that lack the wound healing and matrix remodelling activity specific to GHK-Cu. Don't assume equivalence without data.

Use the peptide you sourced. The hyphen doesn't change the structure, function, or experimental outcome. Cross-check the molecular weight (9117.5 Da for IGF-1 LR3) and sequence on the supplier's COA against published references. If those match, the notation difference is irrelevant. Document the supplier and lot number in your methods section so results can be replicated regardless of how future suppliers format the name.

Confirm that all studies used the 83-amino-acid Long R3 variant, not native 70-amino-acid IGF-1. The easiest check is half-life: if the study reports sustained activity beyond 12 hours without re-dosing, it's almost certainly LR3. If activity drops off within 30–60 minutes, it's native IGF-1. Notation inconsistency across literature is common, but the peptide's biological behavior. Especially half-life and IGFBP independence. Will reveal which form was actually used.

Unlikely. Reconstituted GHK-Cu stored at 2–8°C begins losing copper chelation stability after 4–6 weeks, with measurable declines in fibroblast proliferation assays by week 8. If your solution is three months old, assume copper dissociation has reduced biological activity to subtherapeutic levels. The peptide backbone may still be intact (verifiable by HPLC), but without the 1:1 copper ratio, it won't activate TGF-β pathways or stimulate collagen synthesis at published rates. Discard and reconstitute fresh stock for reliable results.

Request the certificate of analysis (COA) and amino acid sequence for both listings. If the sequences are identical and both show 83 amino acids with the Long R3 modification, they're the same product listed twice under different notations. Some suppliers duplicate catalog entries to capture search traffic for both naming conventions. If the sequences differ. Or one is 70 amino acids instead of 83. One listing is native IGF-1, not the LR3 variant. Always verify peptide length and modification status before ordering.

No. You received the same molecule under a different name. Verify the CAS number on your certificate of analysis reads 49557-75-7 and confirm HPLC purity is ≥98%. If both match, the peptide is identical regardless of whether the supplier labeled it AHK-Cu, GHK-Cu, or copper peptide GHK. The functional test: reconstitute a small aliquot and confirm it dissolves to a clear, slightly blue-tinted solution. The copper ion imparts a faint color that's absent in copper-free peptides.

A faint blue tint is normal. It indicates copper ion presence. Pure lyophilised GHK-Cu ranges from off-white to pale blue depending on copper content and residual moisture. However, a deep or dark blue color suggests excess free copper that isn't properly chelated to the peptide, which increases oxidative stress risk in cell culture models. Request a certificate of analysis confirming the copper-to-peptide ratio by ICP-MS before using the batch in any assay where metal ion toxicity could confound results.