Injectable peptides: Two words that, up until a few weeks ago, I had never thought about. But recently, my algorithm has landed me squarely in the realm of wellness influencers who insist the substances are THE go-to solution to make me fitter, hotter and all-around better off.

If you've spent enough time on social media lately, chances are you've come across peptides, too. Maybe it was a vial of something promising faster recovery after the gym. Maybe it was a tanning injection or a weight loss drug. Or maybe it was a legally questionable tutorial about how to procure and administer the stuff.

But for something so widely discussed, peptides are poorly understood, including by those who use them.

This week, I spoke to Dr Tim Piątkowski, a senior research fellow at the University of Queensland, to get to the bottom of what's driving the peptide trend.

Most articles about peptides will describe them as short chains of amino acids, which are the building blocks of protein. I've read that sentence in a million different forms, and it still means nothing to me.

To put it more simply: peptides act as little signals, telling your cells what to do and when to do it. Your body already produces them naturally. From the insulin managing your blood sugar to the endorphins that kick in after a hard workout, peptides are already quietly running some of your body's most essential functions.

You've almost certainly already encountered the word before. They're marketed in skincare as a collagen booster. They're in protein powders and supplements. And they are now becoming some of the most widely prescribed medications in the world, including Ozempic.

That's right. The world-famous diabetes and weight loss drug is indeed a peptide. But the products flooding social media feeds right now? They're a different beast altogether.

Dr Piątkowski has spent years studying image and performance-enhancing drugs. He says the products driving the current peptide craze are far from pharmaceutical-grade medicines.

"We're really talking about illicit and unregulated substances that people are buying online… Chinese research chemicals," he says.

Some of the most popular include BPC-157 and TB-500, which are commonly used for injury recovery and joint health. Melanotan II is a synthetic tanning peptide injected to increase melanin production. And then there are unregulated versions of GLP-1 drugs like semaglutide (the active ingredient in Ozempic) being sold online to people who want to lose weight but can't or won't go through a doctor.

Buying them, it turns out, is remarkably easy. It only takes a quick search on TikTok to find creators promoting suspicious accounts that offer a wide range of injectable peptides, brewed by manufacturers in China. Crucially, they all note that the products are for "research purposes only".

In Australia, most of these substances are classified as prescription medicines by the Therapeutic Goods Administration. Selling or buying them without a script is illegal. But as Dr Piątkowski points out, “there isn’t any feasible way to monitor the amount of these things that are coming in and out.” 

The peptide trend isn’t being driven by a niche subculture of elite athletes or hardcore gym-goers. According to Dr Piątkowski, the people using these substances look a lot more like the rest of us.

"We don't think of just bodybuilders. We're looking at your neighbour… just regular people using these for youthfulness, wellbeing, confidence, longevity," he said.

That shift has been driven largely by social media, where wellness influencers and fitness personalities have reframed performance-enhancing drugs as tools for health optimisation. The conversation has moved away from sport and cheating, and towards biohacking, anti-aging, and living ‘better’ for longer. 

That shift has seen an increasing number of young people being drawn to the peptide market. Dr Piątkowski says his harm reduction line, Steroid Connect, has received calls from concerned children and parents alike.

"If you are 14, 15, 16, 17, there are so many other levers for you to pull around exercise, diet, supplementation before reaching for those substances," he says. "We just don't know what it's going to do during a critical time of development."

The science on peptides is both promising and incomplete. Dr Piątkowski says there's emerging research around peptides and longevity that has legitimate scientists genuinely excited.

But the version of these drugs being sold online is a very different product to what you'd receive through a doctor.

Dr Piątkowski runs a drug testing program called Roid Check, which analyses image and performance-enhancing drugs purchased on the black market in Australia. The results are sobering.

"Less than one in ten steroids have the right steroid in them and the right dosage. We've also found heavy metals like lead and arsenic outside of the permissible daily limits," he said.

His program is now moving towards testing peptides, and he doesn't expect the results to be much better. On top of contamination risks, there's the simple problem of dosing. Without pharmaceutical oversight, people are largely guessing, and therefore at an increased risk of getting it wrong.

Dr Piątkowski said people have called in to his harm reduction line after using up to five times a therapeutic dose of semaglutide, with predictably unpleasant consequences.

When it comes to tanning peptide injections, health authorities warn use of the unregulated products can lead to increased moles and freckles, kidney dysfunction and swelling of the brain.

And then there's the longer-term picture. Human clinical trials on many of these substances are limited. Long-term studies don't yet exist. The people injecting peptides today are, in a very real sense, running an experiment on themselves.

Despite the concerns, Dr Piątkowski is careful not to be alarmist, and he's more interested in harm reduction than moral judgement.

"We've got tools that could make us healthier, could optimise our wellbeing," he says. "It's actually really exciting, if we could just get rid of all the other stuff."

His solution for the peptide problem isn't a crackdown. It's better public health messaging, more investment in research, and honest conversations about risk — the kind that are notably absent from most of the content pushing these products online.

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