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 FDA Status 2026, Compound by Compound: BPC-157, TB-500 and More
Where each research peptide stands under the 503A framework in October 2026, and what the April removals and July votes did and did not change.
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.
Peptide Supplier Vetting Checklist: 10 Checks Before a First Order
Ten things a buyer can verify without taking a supplier at its word, in the order worth checking them.
FDA Approval vs. 503A Compounding vs. Research Use Only (2026)
Three labels, three legal categories. What each one means, how 503A compounding works, and why "not FDA approved" does not make two products the same.
TFA Salt vs. Acetate Salt Peptides: What the Difference Means
The same peptide chain with a different counter-ion. Why most synthetic peptides are TFA salts, why HPLC purity cannot tell the forms apart, and why it matters in the lab and to regulators.
Research Grade vs. Pharmaceutical Grade Peptides: What Is the Difference?
Pharmaceutical grade has a regulatory meaning. Research grade has no legal definition, and its quality is only as good as the testing behind each lot.
What Is a Lyophilized Peptide?
Frozen, then dried under vacuum so the ice turns straight to vapour. Why research peptides are supplied this way, and what the dry powder can and cannot tell you.