How to Read a Peptide COA: A Field-by-Field Guide

Research use only. Not for human consumption. Not evaluated by Health Canada. This guide covers specifications, storage and documentation. It gives no dosing or usage guidance.

In short.

• A COA only means something if its batch/lot number matches the lot code on your vial, character for character.
• The core results are how much compound the lab measured against the label amount, what it is (identity), and, on many reports, how pure it is.
• A COA records what was measured in one sample at one time. It does not show that a product is safe, authorized or suitable for any use.

The example COA.

This example follows the layout independent peptide-testing labs commonly use. The lab, names and values are made up. It is not a real lot.

Header

Summary of results

Peptide analysis

Identity of the analyte was confirmed by retention time concordance with a certified reference standard, per USP <621>.

Footer: notes, a LOD/LOQ legend, the lab director's signature and date, an accreditation statement (for example ISO/IEC 17025:2017), and a line saying the report applies only to the sample tested.

Field by field.

Header: whose sample, which lot, when.

• Customer is who sent the sample, usually the seller.
• Lab sample ID is the lab's own tracking number. It lets the lab confirm the report is genuine if asked.
• Sample name and type say what was submitted: compound, label amount and form (lyophilized powder, capsule, solution).
• Batch/lot is the field that matters most. It is the link between this report and your vial.
• Date received / date completed show when the lab had the sample. Both should fall after the manufacture date and before the expiry date printed on the vial.

Summary of results.

A one-line index of what was run: the analysis type, the method (here HPLC), the test date, and whether it is complete. If a test you expected is missing from this table, it was not run on this sample. The COA for your lot lists which tests were run on it.

Peptide analysis: the measured amount.

The main row compares what the lab measured with what the label claims.

• Result is the amount of peptide the lab quantified in the vial, here 10.42 mg.
• Specification is the label claim, here 10 mg.

A result slightly above the label amount is common. A result well below it means the vial holds less compound than stated. The lab quantifies the peptide against a certified reference standard of known amount, which is why the identity line below matters too.

LOQ.

LOQ is the limit of quantitation: the lowest amount the method can measure with acceptable precision and accuracy. It tells you the smallest result the lab could have reported. LOD (limit of detection) is lower still: the smallest amount the method can detect but not reliably measure. Check the units in the column header.

Identity: retention time vs mass spectrometry.

Identity answers "is this the compound on the label?". Labs use two main approaches:

• Retention-time concordance (the example above). In HPLC, each compound leaves the column at a characteristic time under fixed conditions. If the sample's main peak appears at the same time as a certified reference standard run on the same method, the identity is confirmed by concordance. USP <621> is the United States Pharmacopeia's general chapter on chromatography.
• Mass spectrometry. The lab measures the molecule's mass and compares it with the theoretical mass calculated from its formula. For BPC-157, that is 1419.5 g/mol. Mass spectrometry measures the molecule directly, so it is the more specific test.

Either line should state the method used. A COA with no identity statement does not show what the compound is.

Chromatographic purity.

When reported, purity is the main peak's area as a share of all UV-absorbing peaks on the HPLC chromatogram. "Report only" means the lab states the figure without judging it against a limit. If the seller states a release threshold, that is the number to compare it with.

Purity by peak area does not account for water or counter-ions such as acetate or trifluoroacetate, which do not show up as peaks. That is why the measured-amount row and the purity row answer different questions. See Peptide purity, explained.

Notes and footer.

• Notes may explain what the method cannot see, for example that non-UV-absorbing ingredients are not detected and are not counted as impurities.
• Signature and date show who approved the report.
• Accreditation statement. ISO/IEC 17025 is the international standard for the competence of testing and calibration laboratories.
• "Applies only to the sample tested" means exactly that: the report describes that sample, not every vial ever sold under the same name.

Match the COA to your vial.

1. Find the lot code and expiry date on the vial label.
2. Check that the COA's batch/lot shows the same code, character for character.
3. Check that the sample name matches the compound and label amount on your vial.
4. Check that the test dates fall between the manufacture date and the expiry date.

If you bought from Vitaliti and want the COA for your lot, email contact@vitalitipeptide.com with the lot code from your label.

Red flags on any COA.

What a COA does not prove.

A COA reports specific tests on one sample at one time. It does not show:

• that the product is safe for any purpose;
• that it is authorized or approved by Health Canada or any regulator;
• that it is suitable for any particular use;
• how the vial has been stored since it left the facility.

Read it as a record of what was measured, and nothing more.