Reference library
Research guides
Analytical reference material, free and without registration. Written because the questions below come up constantly and the answers are scattered across supplier FAQs, forum threads, and method papers.
Peptide stock solution calculator
Concentration and molarity from label claim, solvent volume and peptide content. The content correction most calculators leave out.
What the July 2026 PCAC Votes Did and Did Not Change
An advisory committee recommended six peptides for the 503A Bulks List. Four distinct regulatory states are being collapsed into one headline.
How to Read a Peptide Certificate of Analysis
Line by line, using a real published lot: what purity, identity, quantity and endotoxin results mean, and the certificate errors worth catching.
HPLC Purity vs. Mass Spectrometry Identity: Why You Need Both
The two analytical methods answer different questions, and a certificate with only one leaves a gap.
Peptide Storage and Stability: A Laboratory Reference
Temperature, light, moisture, and freeze-thaw — what actually degrades peptide material and what the data shows.
Research Use Only: What the Designation Actually Means
The regulatory basis for RUO labelling, what it permits, and what it does not.
How to Evaluate a Research Peptide Supplier
Which supplier claims can be checked independently, which cannot, and what the difference tells you.
Peptide Regulatory Status: What the 2026 FDA Actions Did and Did Not Change
The 503A framework, the April removals, the July advisory vote, and why the coverage of all three has been consistently wrong.
Reconstitution and Solution Preparation
Solvent selection, working out concentration, and what to do when material does not behave as expected.
Temperature Excursion and Assessing Material on Receipt
What transit warmth does to lyophilised material, what can be established by inspection, and what cannot.
BPC-157 and TB-500: Structural and Analytical Comparison
Two compounds routinely discussed together, with almost nothing structural in common.
Incretin Receptor Agonists: Single, Dual, and Triple Receptor Targeting
What receptor targeting means, how single, dual, and triple agonists differ structurally, and why the naming is confusing.
What Is a Peptide?
Where peptides sit between amino acids and proteins, how synthetic ones are made, and why sequence determines almost everything downstream.
Metered Solution Formats: Formulation and Stability
How a prepared solution format differs from lyophilised material, and what that means for stability, preservative content, and analytical records.
Peptide Co-formulation: Compatibility and Verification
Why multi-component preparations are formulated rather than combined, what determines whether two compounds are compatible in one solution, and what a blend certificate can establish.