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VendorVerify

The VendorVerify blog

Comparisons

How to read peptide lab reports, spot a fake, and make sense of what independent lab tests actually find. Written from the data, not from vendors.

For research use only. VendorVerify sells nothing and takes no money from vendors. No affiliate links, no coupon codes, no paid rankings. How scores work

ComparisonsSemaglutide vs Tirzepatide: Weight Loss, Evidence and Lab ResultsBoth are FDA-approved GLP-1 drugs, and one trial has compared them head to head in people with obesity. Here's what it found, how the risks line up, and what independent lab reports show for the research-labeled versions.Sep 30, 2026
ComparisonsTirzepatide vs Retatrutide: Approval, Evidence and Lab ResultsRetatrutide adds a third receptor to tirzepatide's two, but only tirzepatide is approved. A head-to-head trial is underway and hasn't reported. Here's what each compound's evidence shows and what independent lab reports found.Sep 30, 2026ComparisonsSemaglutide vs Liraglutide: Weight Loss, Evidence and Lab ResultsSame drug family, same company, different generations. Two head-to-head trials put semaglutide and liraglutide side by side. Here is what they showed, where the evidence for each is strongest, and what independent lab tests say about vials sold under each name.Sep 30, 2026ComparisonsBPC-157 vs TB-500: Different Peptides, Thin Evidence and Lab ResultsBoth are sold for healing and recovery, and both are usually discussed as a pair. They are different molecules with different research behind them, and neither is an approved drug. Here is how the evidence, the risks and the lab results compare.Sep 30, 2026ComparisonsCJC-1295 vs Ipamorelin: How They Differ, What the Evidence Shows and Lab ResultsOne is a growth-hormone-releasing-hormone analog, the other a ghrelin-receptor agonist. Neither is approved for anything, and no published human study has tested them together. Here is the side-by-side, with independent lab data.Sep 30, 2026ComparisonsIpamorelin vs Sermorelin: Approval History, Evidence and Lab ResultsOne is a fragment of the body's own growth-hormone-releasing hormone that was FDA-approved and later discontinued for commercial reasons. The other is a ghrelin-receptor peptide that was never approved. Here is the evidence side by side.Sep 30, 2026ComparisonsSermorelin vs Tesamorelin: Approval, Evidence and Lab ResultsTwo GHRH analogs, two very different regulatory stories: one has a current FDA label for a single use, the other lost its US product in 2009. Here is what the evidence shows for each, and what independent lab tests find in vials sold under both names.Sep 30, 2026ComparisonsSemax vs Selank: Two Russian Peptides, Their Evidence and Lab ResultsSame institute, same stabilizing tail, different starting molecules: Semax is studied for stroke and cognition, Selank for anxiety. Here is what the human evidence shows for each, what FDA has said, and what independent lab tests find.Sep 30, 2026ComparisonsMelanotan I vs Melanotan II: Approval, Evidence and Safety SignalsTwo peptides with nearly the same name and very different histories. One is the same molecule as an approved drug for a rare disease; the other has never been approved and carries the more serious case reports. Here is the side-by-side, with what independent lab tests show.Sep 30, 2026ComparisonsBPC-157 vs GHK-Cu: Two Evidence Gaps, Compared with Lab ResultsBoth are sold as injectable vials, and neither is an approved drug. But the evidence gaps are different: BPC-157's is between rodents and people, GHK-Cu's is between skin creams and injections. Here is how the evidence, risks and independent lab results compare.Sep 30, 2026ComparisonsFinnrick vs. Janoshik vs. VendorVerify: what each one actually measuresThese three names get used interchangeably, but they're not the same kind of thing. Here's what each one actually does, sourced from their own sites, and when to reach for which.Sep 28, 2026ComparisonsWhy most "best peptide vendor" lists are written by vendorsA ranking that gets paid every time you click a link has a reason to put a specific vendor at the top that has nothing to do with lab results. Here's how to tell the difference.Sep 28, 2026