Certificate of analysis
A certificate of analysis records what a specific batch actually contains: the compound, the measured purity, the testing methods, and the issuing laboratory. A batch-specific certificate from an accredited, independent lab is the difference between a quality claim and a quality fact. Every FeelGood compound is sourced in the United States or Europe and tested by an independent laboratory working to ISO/IEC 17025 standards.
Mass spectrometry
Identity
The observed mass confirms the molecule is the stated peptide.
Reverse-phase HPLC
Purity
The target peptide as a percentage of total ultraviolet-absorbing area.
Mass balance
Net peptide content
The actual peptide mass per vial, after water and counter-ion are subtracted.
Ion chromatography
Counter-ion
The salt form, acetate or trifluoroacetate, disclosed and quantified.
Karl Fischer titration
Water content
Residual moisture measured rather than estimated.
LAL assay
Endotoxin
Reported as a number in endotoxin units per milligram.
Roughly nine in ten peptides on the United States market are sourced from grey-market suppliers with no batch testing. The contrast is the standard FeelGood holds to: independent, batch-specific, and documented.
A certificate is issued for each production batch. The examples below show the fields a research-grade certificate reports. Figures are placeholders.
Certificate of Analysis
ISO/IEC 17025 lab
Illustrative example. Figures are placeholders.
Certificate of Analysis
ISO/IEC 17025 lab
Illustrative example. Figures are placeholders.
Certificate of Analysis
ISO/IEC 17025 lab
Illustrative example. Figures are placeholders.
Each line on a certificate answers a different question, and the most practical one, how much peptide a vial actually contains, is not the purity figure. The field-by-field guide explains what each number means and what a research-grade result looks like.
Educational content only. Not medical advice. FeelGood does not claim that any peptide treats, cures, prevents, or mitigates any disease or condition.