Testing Field Guide

What Third-Party
Testing Actually Covers.

"Third-party tested" is the most common claim in research peptides and the least specific. It can mean a full contamination panel on every batch, or one identity check on one batch years ago. The claim is only as good as the list of tests behind it. This is that list.

The panel. Test by test.

Eight tests can appear on a certificate. Each one measures one thing, misses everything else, and says something specific by its absence. This is a description of test types, not a certificate.

01

Identity

Look forIdentity result + MS method

CatchesWhether the material is the compound on the label.

Does not catchPurity, quantity, contamination.

If the line is missingNo foundation: every other number describes an unconfirmed molecule.

02

Purity

Look forPurity result + HPLC method

CatchesThe fraction of peptide content that is the target sequence, vs. truncated or modified sequences.

Does not catchNon-peptide contaminants; the amount in the vial.

If the line is missingComposition has not been measured.

03

Conformity

Look forResult per vial, 2–3 vials sampled

CatchesVial-to-vial consistency. Two or three vials are pulled from the same batch and measured, so the result describes the batch, not one hand-picked vial.

Does not catchWhat the material is, or what else is in it.

If the line is missingOne vial was tested, and the rest of the batch is assumed to match it.

04

Label claim

Look forTested mg vs. labeled mg

CatchesTested milligrams against labeled milligrams.

Does not catchWhat those milligrams are.

If the line is missingUnderfill cannot be ruled out: the label is the only source for the amount.

05

Endotoxin

Look forLAL result + reporting units

CatchesBacterial byproducts that survive filtration and are invisible in a clear vial.

Does not catchViable organisms, metals.

If the line is missingThe material can look clean and still carry a research confound.

06

Sterility

Look forCulture result

CatchesViable microbial growth in the finished material.

Does not catchNon-viable byproducts (that’s endotoxin), metals.

If the line is missingMicrobial contamination is unassessed.

07

Heavy metals

Look forICP-MS result per element

CatchesLead, mercury, arsenic, cadmium from synthesis or handling.

Does not catchOrganic contaminants.

If the line is missingResidue from the synthesis route is unassessed.

08

Fentanyl screen

Look forImmunoassay or LC-MS result

CatchesCross-contamination from the handling environment.

Does not catchAnything else.

If the line is missingNo statement about the testing environment’s separation discipline.

"Tested" is a range, not a fact.

Identity-only

1 line

One MS run. Confirms the molecule and nothing else. The minimum that still lets a vendor say "tested."

Identity + purity

2 lines

The common two-line certificate. Says what the peptide is and how clean the peptide fraction is. Nothing about the material around it, or the amount in the vial.

Full panel

8 lines

Identity, purity, conformity, quantity, endotoxin, sterility, metals, contamination screen. The molecule and the material.

The question to ask any vendor is not "is it tested" but "which lines are on the certificate." A certificate with two lines is not wrong. It is two lines.

Batch-level or brand-level.

Testing has a scope in time as well as in panels. A full panel run once, shown for everything sold since, covers one synthesis run. Forge runs the panel per batch: one certificate per batch, linked from the listing for the batch actually in stock. How to read a COA covers checking that the numbers match.

How a Forge panel is assembled.

One certificate per batch

The batch number on the certificate is the lab’s own identifier, recorded exactly as issued. It is the key you can take outside Forge: the named independent lab can confirm it issued that result.

Blends are tested as their parts

A blended vial contains compounds synthesized and tested separately, so a blend listing resolves to one certificate per component, not one for the mixture. It is verified only when every component’s certificate is published.

Nothing typed by hand

The purity figure and the verified badge on a Forge listing are read from the certificate record. A product with no linked certificate shows no verified claim at all.

Check a vendor’s panel in four steps.

01

Open the certificate for the batch on the listing.

02

Count the lines. Identity and purity alone is the two-line case above.

03

Find the contamination rows: endotoxin, sterility, metals, screen.

04

Note the lab’s name and the test date. Without both, nothing can be confirmed by anyone but the vendor.

Sign in to see every COA

All Forge products are for research use only and are not for human or veterinary use. Nothing on this page is guidance for any use of any compound; it describes laboratory testing methods and documentation practice.