Australia flags health risks linked to peptide use: What are they and why are they risky

If you have spent any time on wellness social media lately, you have probably come across peptides. They're being sold as the next big thing in anti-ageing, fat loss, muscle repair, skin glow, and apparently just about everything else. And now Australia's medicines regulator, the Therapeutic Goods Administration, has stepped in with a formal safety alert, because the gap between the hype and the evidence is getting dangerously wide.

So what exactly is a peptide?

At its most basic, a peptide is a short chain of amino acids, the same building blocks that make up proteins. Peptides can mimic or stimulate natural biological processes in the body, including those involved in growth, metabolism and tissue repair. That's not pseudoscience. That part is real. In fact, some peptide-based medicines are already approved and widely used. Insulin, for instance, is a peptide. So are certain treatments for hormonal conditions. The problem isn't peptides themselves, it's the flood of unregulated, unverified versions of them being sold online, often in injectable form, to people who have no idea what's actually in the vial.


“We are aware that the use or supply of unapproved peptide products is being promoted on a number of online and social media platforms, with claims they have a range of health benefits including weight loss, muscle growth, anti‑ageing, and enhancing cognitive and athletic performance. These products have not been evaluated for safety, quality or effectiveness by the TGA. Examples of unapproved peptide products include those containing BPC‑157, GHK‑Cu, TB‑500, retatrutide and CJC‑1295, often supplied in injectable form,” the TGA has said.


And they're not hard to get — most are a few clicks away from overseas sellers who ask minimal questions and promise fast shipping and high purity.

Why the sudden popularity?

A lot of it comes down to how the conversation has shifted around health optimisation. These compounds are promoted on social media as tools for skin repair, collagen production and cellular rejuvenation, widely available online from overseas sellers despite many peptides being unregulated in Australia.


Unapproved peptide products have not been assessed by the TGA for safety, quality or effectiveness. What remains unknown includes how they are manufactured, whether they are sterile, how they work in the body, what side effects they may cause, and what substances these products actually contain. That's a significant list of unknowns for something people are injecting into themselves.


And the injection part matters enormously. Unapproved peptide products that are injected carry significant safety risks including contamination, infection or local tissue damage. There's also the question of what else might be in the product — because labelling for these things is often unreliable or deliberately vague. Unregulated peptides may be mislabelled, contaminated or incorrectly dosed, a problem already documented in adjacent markets like counterfeit steroids.