Australia Post and Facebook Used to Illegally Sell Unregulated Peptides

According to the Australian Broadcasting Corporation (ABC), illicit dealers are distributing unapproved and experimental peptides—including the unauthorized weight-loss drug retatrutide—via Facebook Marketplace for cash transactions. Australia’s medicine regulator, the Therapeutic Goods Administration (TGA), has warned that these unregulated injectables can cause severe adverse effects such as liver damage, inflammation, and allergic reactions, prompting urgent public health warnings and ongoing law enforcement seizures across the country.

Unregulated Peptides Sold via Facebook Marketplace

Unapproved peptide products are circulating widely across social media platforms like Facebook Marketplace, where sellers often operate under pseudonyms and blank profile pictures. According to the ABC, an investigation demonstrated how easily a buyer can exchange $50 in cash for a pouch containing a vial and a single syringe. The substances commonly offered include melanotan II, a dangerous tanning peptide, and retatrutide—frequently referred to as “reta”—an experimental weight-loss drug linked to liver failure.

Sellers typically procure these items from overseas manufacturers in China, often providing customers with a manufacturer’s “certificate of analysis.” However, University of Queensland researcher Dr Timothy Piatkowski noted that such documentation is hard to verify without a secure chain of custody. Many online listings attempt to bypass platform restrictions by marketing the substances as “unopened gym supplements” or attaching disclaimers stating the goods are strictly for laboratory research and “NOT for human consumption.” Despite these labels, no rigorous proof-of-age checks are enforced.

Health Risks and TGA Warnings on Retatrutide

Peptides are short chains of amino acids that form proteins in the body and regulate functions like immunity, weight, and hormones. While certain peptides like insulin and specific GLP-1 medications are approved by the TGA for medical use when prescribed, experimental variants like retatrutide remain entirely unregulated and illegal to sell, supply, or advertise in Australia. The TGA has issued direct warnings to social media influencers that large fines and penalties apply to the illegal promotion of these substances.

The health consequences of using unapproved compounds are already manifesting. According to health authorities, Victoria has recorded six cases of acute liver injury this year among individuals using unapproved retatrutide. Laboratory testing of confiscated peptide samples—including retatrutide, PBC-157, TB-500, and GHK-Cu—revealed that none of the products contained the dosages advertised on their labels. Dr Piatkowski noted that one sample of TB-500 contained no active ingredient at all, while a retatrutide vial measured at 190 per cent of its labelled claim. Furthermore, small amounts of lead and cadmium were detected in some samples, though these did not exceed permissible daily limits.

Law Enforcement Seizures and Platform Responses

Federal and state authorities have ramped up enforcement operations to combat the illegal trade. In April 2026, a joint operation involving the Australian Border Force, Victoria Police, and the TGA led to the arrest of two men and one woman following the disruption of a peptide and steroid ring, with officers seizing $2 million worth of products.

Technology companies have also faced scrutiny over listings on their platforms. A spokesperson for Meta, the parent company of Facebook and Instagram, stated that marketplace ads for peptides violate company policies against unapproved prescription drugs, and that automated systems work to remove them when identified. Similarly, a TikTok spokesperson confirmed that the platform blocks search terms related to retatrutide, ensuring users are not shown videos that breach strict community guidelines. To address the broader public health crisis, researchers, harm reduction advocates, and authorities are scheduled to convene at a roundtable hosted by the University of Queensland.

Frequently Asked Questions

Are all peptides illegal in Australia?

No. Certain peptides, such as insulin and specific GLP-1 medications, are approved by the TGA and can be legally prescribed by a doctor for medical management. However, experimental and unapproved peptides—such as retatrutide—are illegal to sell, supply, or advertise.

What are the main health risks of using unregulated peptides?

According to the TGA and independent researchers, unapproved injectables can cause severe adverse effects, including acute liver injury, elevated heart rates, gastrointestinal upset, inflammation, and severe allergic reactions. Laboratory testing has also shown that black-market vials frequently feature inaccurate dosages and trace heavy metals.

Can social media platforms stop the sale of these drugs?

While companies like Meta and TikTok maintain strict policies against advertising prescription or high-risk goods and removing violating content, illicit sellers frequently circumvent automated detection tools by using pseudonyms, coded language, or listing the products as laboratory research chemicals.