Health authorities in New South Wales are warning Australians about the potential dangers of using unapproved peptide products after new data revealed a significant increase in emergency department presentations associated with their use. The warning was reported by ABC News on 19 October 2026, as officials raised concerns about the growing number of people experiencing health problems after using these substances.

According to data released by NSW Health, monthly emergency department presentations linked to unapproved peptide use increased from five in July 2025 to 220 in September 2026. The rise has prompted renewed calls for people to seek medical advice before using products promoted for fitness, bodybuilding, weight management, recovery or anti-ageing purposes.

Peptides are short chains of amino acids, which are the building blocks of proteins. Some peptide-based medicines have legitimate medical uses and are prescribed for specific conditions. However, not every product marketed online or through social media has been approved for human use, and products sold outside regulated medical channels may have uncertain ingredients, purity or dosage.

NSW Health Minister Ryan Park has urged people to use only peptides prescribed by a general practitioner and dispensed by a pharmacy. The advice reflects concerns that consumers may be purchasing products without adequate medical supervision or reliable information about their safety.

Some unapproved products are promoted online with claims that they can improve muscle growth, accelerate recovery from injuries, change body composition or slow the effects of ageing. Such marketing can make products appear safe or scientifically established even when evidence supporting their use is limited. A product's availability online does not mean it has undergone the safety and quality assessments required for approved medicines.

Potential risks depend on the substance, dose, how it is administered and the person's health. Products obtained from unreliable sources may also be contaminated, incorrectly labelled or different from what buyers believe they are purchasing. Injections can introduce additional risks, including infection if products or equipment are not sterile.

Health professionals are concerned that people may use these substances without telling their doctors, making it more difficult to identify the cause of unexpected symptoms. Patients who experience concerning symptoms after using a peptide product should seek medical advice and provide accurate information about what they took, how much they used and where it came from.

The rise in hospital presentations does not necessarily mean every person using peptides will experience a serious reaction. However, the figures indicate that health services are encountering the issue more frequently and that consumers need clearer information about the potential consequences.

The warning also highlights the challenges regulators face when products are promoted through online marketplaces and social media. Consumers may find it difficult to distinguish legitimate medicines from experimental substances or products marketed without sufficient evidence. Medical professionals and health authorities continue to emphasise the importance of reliable prescribing, pharmacy supply and appropriate monitoring.

People considering peptide treatments should discuss their goals and concerns with a qualified healthcare professional rather than relying on online testimonials or promotional claims. Those already using unapproved products should seek medical advice about potential risks and appropriate next steps.

NSW Health's message is straightforward: avoid self-prescribing unapproved peptides, and use medicines only under appropriate medical supervision. The latest figures underline why authorities are urging greater caution as the number of related emergency presentations continues to rise.