Testing & Quality
BPC-157 vs BPC-159: Verifying Which One You Have
BPC-159 has no published literature. Several BPC-157 name variants circulate, and only the sequence and observed mass settle which is in a vial.
Purity, testing and documentation
Purity and net peptide content are two different numbers and a report states them differently. These articles explain how to read HPLC purity, mass spectrometry identity and net peptide content, what a chromatogram shows, what the impurities in a synthetic peptide usually are, and what testing cannot tell you. They describe how to read documentation, not what any particular supplier’s documentation contains.
Testing & Quality
BPC-157 Arginate vs Acetate: What the Salt Form Changes
BPC-157 arginate and acetate differ only in counter-ion, not in peptide. What a salt form affects, why published research used no carrier, and how to check.
Testing & Quality
BPC-157 Purity Testing: How to Read a Certificate
What HPLC purity, mass spectrometry and third-party testing actually tell you about a BPC-157 lot, what they miss, and how to read a certificate of analysis.
Testing & Quality
How Are Peptides Made? Solid-Phase Synthesis Explained
Research peptides are built one residue at a time on a solid resin, then cleaved, purified by HPLC and freeze-dried. Each step explains part of the COA.
Testing & Quality
What ‘Research Use Only’ Means for Peptides
Research use only is a statement about regulatory status, not quality. What it means, how RUO material differs from a medicine, and what a COA can establish.
Testing & Quality
Peptide Counterions: TFA vs Acetate and Why It Matters
Every basic peptide arrives as a salt. Why trifluoroacetate is the default, what exchange achieves, and how the counterion distorts concentration.
Testing & Quality
How to Verify Sermorelin Identity From Its Data
Sermorelin is a 29-residue fragment that is easy to misidentify. The checks that distinguish it from its analogues using certificate data alone.
Testing & Quality
Custom Peptide Synthesis: What to Specify
A custom peptide order is a specification, not a request. Which parameters to state, which sequences are difficult, and what the quotation leaves out.
Testing & Quality
How to Read a Peptide Certificate of Analysis
A certificate of analysis reports purity, identity and content. What each number means, what it does not cover, and which omissions matter most.
Testing & Quality
Peptide Vials: Sizes, Glass Types, Stoppers and Fill
Peptide vial sizes explained: 2, 3, 5 and 10 mL vials, Type I glass, stoppers and coring, headspace, and how vial size limits reconstitution volume.
Testing & Quality
Tirzepatide Powder: Appearance, Colour and Quality Tests
What lyophilized tirzepatide powder and solution should look like, what colour changes mean, and how identity, purity and content are tested.
Testing & Quality
What Are Lyophilized Peptides? Freeze-Drying Explained
Lyophilized peptides are freeze-dried powders made for stability. How freeze-drying works, what the powder contains, net content and reading the COA.