Guides

Why dry and dissolved peptides need different storage, and how to handle each.

When people evaluate a research peptide’s quality, the first number they look at is usually the HPLC purity percentage. But purity is only one of the questions a good Certificate of Analysis answers — and on its own it can be misleading. Here is why endotoxin testing matters just as much. Purity answers one question…

“503A” and “503B” come up constantly in peptide regulation news, but the two terms describe very different things. Here is a clear, non-legal explainer of the two compounding pathways and why the distinction keeps appearing in peptide headlines. Two different compounding pathways Both 503A and 503B refer to sections of the Federal Food, Drug, and…

If you follow peptide research, you have probably seen headlines about an FDA advisory meeting in July 2026. Here is a plain-language guide to what the Pharmacy Compounding Advisory Committee (PCAC) actually does, what “503A” means, and why none of it is a simple yes-or-no on whether a peptide is “approved.” What is PCAC? The…

The parts of a U-100 insulin syringe and how the unit scale maps to volume.

Reconstituted peptide shelf life explained: why mixed peptides last only days to weeks, what beyond-use dating means, and how to store and label them.

GHRH vs GHRP explained: how GHRH analogs (sermorelin, CJC-1295) differ from GH secretagogues (ipamorelin, GHRP-2, MK-677), and why they are combined.

A balanced, sourced look at growth hormone peptide side effects — fluid retention, joint aches, higher blood sugar and appetite — and why they happen.

How mg, mL, and mg/mL relate, with worked lab-math examples.

mcg vs mg in peptide lab math: 1 mg equals 1000 mcg, how to convert, and how concentration (mg/mL) ties the units together with a worked example.