Australians are sending peptide vials to labs. Here is what a test shows

A growing number of Australians who have bought peptides are now paying a laboratory to check what is actually in the vial. Peptide Testing Australia is an Australian testing service that checks the identity and purity of peptide samples sent by post, and returns a Certificate of Analysis for each vial.

The service uses two laboratory methods. High performance liquid chromatography (HPLC) separates a sample into its components and shows how much of it is the main compound, which gives a purity figure. Mass spectrometry measures the mass of the molecules present, which confirms whether the compound is the peptide on the label. The company says testing is carried out through accredited laboratory partners.

Why people are testing

Peptides have moved from bodybuilding forums into the mainstream. Our republished explainer from the University of Queensland's Samuel Cornell sets out what peptides are and why they are suddenly everywhere, and University of Sydney law lecturer Christopher Rudge describes how wellness clinics supply unapproved peptide injections.

Much of the supply sits outside the regulated medicines system. The Therapeutic Goods Administration explains how it regulates therapeutic peptide products and has issued a series of warnings this year, including a safety advisory on responsibilities for unapproved peptide products, an alert after it tested a counterfeit retatrutide product following a serious adverse event report, and a finding that Melanotan II tanning products were inconsistently dosed.

Research on medicines bought online points the same way. A 2024 study in JAMA Network Open that purchased semaglutide from online sellers without a prescription found problems with product quality and labelling. For a person holding a vial bought online, the label is often the only information they have.

What a test shows

A Certificate of Analysis from a peptide test typically reports two things.

• Identity. Mass spectrometry compares the measured molecular mass with the expected mass of the named peptide. A match supports that the vial contains what the label says.
• Purity. HPLC reports the main compound as a percentage of everything detected. Chromatography also shows other peaks, which can point to related impurities, the kind of by-products researchers have catalogued in peptide medicines.

In Australia, testing laboratories are commonly accredited to the ISO/IEC 17025 standard, which NATA assesses for technical competence, method validation and quality control.

Reading a certificate

A certificate of analysis usually lists the sample as received, the methods used and the results. On the purity side, look for the main peak's share of everything detected, often reported as an area percentage from the HPLC trace, and for the trace itself. On the identity side, look for the observed molecular mass beside the expected mass for the named peptide. A close match supports the label, while a different mass points to a different compound, a fragment or a modified product.

A result describes the vial that was tested. Products from the same seller can vary from batch to batch, which is why testing is done one vial at a time, and why the TGA's findings on inconsistently dosed products matter to anyone relying on a label.

Peptide Testing Australia publishes guides on how to read a test result, a peptide library describing more than 60 compounds and a reconstitution calculator, so customers can make sense of their certificate when it arrives.

How the service works

Customers order online and post their sample. The service accepts samples sent from within Australia. Pricing is A$575 per vial including GST, with 10% off additional vials and an extra A$185 for blends or stacks. Results take around five to seven business days after the sample arrives, plus postage.

Peptide Testing Australia does not sell, supply or source peptides, which keeps the test separate from the product being tested, and it publishes a peptide library and guides on reading results. Customers can also test blends and stacks, and order more than one vial at a time when they want to compare products or batches. Details and ordering are at peptidetesting.au/testing.

Where testing fits

For readers already using these products, the public health researchers whose work we republish make a consistent point: know what you are taking. Cornell's piece on safety basics for people who inject peptides and Timothy Piatkowski's work on peptides on social media both stress better information. A laboratory result for the specific vial in your hand is one of the most direct pieces of information available. It replaces a guess about the label with a measured answer, and it gives a doctor or pharmacist something concrete to discuss if a person decides to seek advice about what they have been using.

Many peptides are prescription-only or unapproved in Australia, and the Poisons Standard and TGA rules apply regardless of testing. Athletes should also check Sport Integrity Australia's guidance on peptides, because many are prohibited in sport.