Most of what gets written about human growth hormone argues about whether it works. This post assumes, for the sake of argument, that pharmaceutical somatropin does exactly what its label says — and asks a narrower question instead: when someone buys a vial outside the prescription system, what is actually in it?

That question has been answered, at least partly, by regulators and by a handful of analytical chemistry papers. The answers are not reassuring, and they are specific enough to be useful. If you want the background on what HGH is and what it's approved to treat, our HGH profile page covers that ground; this is about the supply chain.

What is HGH, and what makes a vial "grey-market"?

Human growth hormone is a 191-amino-acid protein secreted by the pituitary. The pharmaceutical version, somatropin, is produced by recombinant DNA technology and is a registered prescription medicine in Australia — Schedule 4, TGA-approved and PBS-subsidised for a defined set of conditions including paediatric growth hormone deficiency, Turner syndrome and adult GH deficiency, under strict authority criteria.

A "grey-market" vial is one that arrives outside that chain: an overseas website, an unregistered importer, a gym contact. The product may be diverted genuine stock, an unregistered foreign generic, or an outright counterfeit. From the buyer's side these look identical, because the only signal available is the box.

What testing has actually found in internet-sourced HGH

Under-dosed, essentially across the board

The most directly relevant analysis is a 2016 paper in the International Journal of Clinical Pharmacy, which sampled the online somatropin market between June and August 2014. Of 17 individual vendor websites, 94% dispensed without requiring a valid prescription, 70% displayed no medical information at all, and none displayed any regulatory body logo. The purchased products were then analysed by capillary electrophoresis and mass spectrometry.

The finding: all samples contained significantly less somatropin than the label claimed (p < 0.001).

Be clear about the limits. This is a single study, the sampling is now over a decade old, the sample size is small, and it wasn't Australian. It has not been systematically replicated on the current market. But it is one of the few times anyone has bought from these vendors and put the contents through an analytical lab, and the direction of the result is consistent.

Sometimes it isn't growth hormone at all

Historical counterfeit cases in the United States are a sharper warning. When counterfeit Serostim (somatropin) turned up across several US states, FDA laboratory analysis found that the first lot of fake product contained human chorionic gonadotropin — a different hormone entirely. Separately, Genentech issued a statement on counterfeit vials labelled as Nutropin AQ 10 mg, where the FDA determined that at least one vial contained human insulin.

That second one is the reason this matters clinically rather than just financially. Injecting an unknown quantity of insulin while expecting growth hormone is a hypoglycaemia risk, not a wasted-money risk.

"191 amino acid" is a marketing phrase, not a spec

Grey-market listings lean heavily on "191aa" as a quality signal. It isn't one. Genuine somatropin is 191 amino acids; so is anything a counterfeiter chooses to print on a box. Analytical work using LC-MS/MS has shown that counterfeit and follow-on recombinant HGH products can differ from innovator product in subtle ways — notably in the degree of oxidation at methionine residues — meaning that even a product genuinely containing growth hormone sequence may not be the same molecule in terms of purity, modification profile or immunogenicity. Nothing on a label distinguishes those cases.

The cold-chain problem nobody advertises

Somatropin is a protein, and protein products are not shelf-stable in the way small molecules are. Storage requirements differ meaningfully by brand: Norditropin FlexPro and Omnitrope require continuous refrigeration at 2–8°C, while Genotropin GoQuick and Saizen permit defined periods at room temperature. After reconstitution, most products require refrigeration and have a limited in-use window.

A vial that has spent an unknown number of weeks in air cargo, in a warehouse and in an unrefrigerated parcel has an unknown potency, regardless of what was in it when it was filled. This is a failure mode that no amount of "genuine product" reassurance from a seller can address.

Is HGH legal in Australia? The TGA and border position

Somatropin is Schedule 4 in Australia — prescription only. Possessing or importing it without a valid Australian prescription is illegal, and importation is separately controlled at the border.

The TGA has a standing safety alert on counterfeit "Novartis-Bio Somatropin HGH" (3.7 mg vials, sold as 10 x 10 IU) after reports of the product circulating in the community. Working with Sandoz and Novartis Australia, the TGA established that the product is not marketed in Australia by either company, and Novartis-Bio confirmed it is not a commercial product of Novartis Australia — with packaging and an invalid batch number pointing to counterfeit. The TGA stated it would notify the Australian Border Force to seize and destroy any such products intercepted at the border. That alert has been on the TGA's pages for some years; it is context, not breaking news.

The scale of the traffic is easier to see overseas, where enforcement publishes numbers. In March 2026, US Customs and Border Protection officers in Chicago seized 351 air cargo shipments of unapproved human growth hormones and steroids — 455 pounds, valued at over US$3.2 million — mostly originating from China, concealed as unmanifested parcels inside master cartons for onward domestic posting. That's one city, one month, one enforcement agency. Australia is not the destination in those figures, but the logistics model described is the same one that supplies Australian buyers.

Where this leaves the risk calculation

It's worth putting the supply question next to the benefit question, because the two are usually discussed separately.

In healthy older adults — the "anti-ageing" use case that drives most non-prescribed demand — controlled trials of growth hormone have shown gains on the order of about 2 kg of lean mass, accompanied by real and common side effects: oedema, arthralgia, carpal tunnel symptoms and worsened insulin sensitivity. Fat mass falls modestly; functional outcomes such as strength have not reliably followed. HGH is also prohibited at all times by WADA, in and out of competition, and is detectable.

So the honest framing is this: the expected benefit in a healthy adult is small and comes with a documented side-effect burden, and that benefit is calculated from trials using pharmaceutical-grade, cold-chain-maintained product at controlled doses. A vial of unknown potency and unknown contents doesn't sit somewhere on that same curve — it sits off it entirely.

For approved indications, the medicine works and the system that delivers it is what makes the trial evidence applicable. For everything else, the evidence on the product itself is the part most often skipped. More on the wider peptides landscape, and you can join the free updates list if you'd like new evidence reviews as they're published.

FAQ

Is HGH legal in Australia?

Somatropin is a Schedule 4 prescription-only medicine in Australia, TGA-approved and PBS-subsidised for defined conditions. Possessing or importing it without a valid Australian prescription is illegal, and shipments can be seized and destroyed at the border.

How do you know if HGH is fake?

Realistically, you can't tell from the vial or box — counterfeits have used correct-looking packaging, and the TGA identified one counterfeit somatropin product partly by an invalid batch number. Only laboratory analysis distinguishes genuine, under-dosed and substituted product.

What did testing find in internet-bought HGH?

In a 2016 analysis of 17 no-prescription online vendors, every sample tested contained significantly less somatropin than labelled. Separate FDA counterfeit investigations found fake somatropin vials containing hCG in one case and human insulin in another.

Does HGH need to be refrigerated?

Most somatropin products require refrigeration at 2–8°C, though some brands allow limited room-temperature storage and requirements differ by product and by whether the pen has been reconstituted. Uncontrolled shipping and storage can reduce potency regardless of what the vial originally contained.

Sources

This article is independent information, not medical advice. Somatropin is TGA-approved and PBS-subsidised in Australia for defined conditions as a Schedule 4 prescription-only medicine; use outside those channels is unlawful and is prohibited in sport by WADA. We are not affiliated with any manufacturer or supplier and we do not sell or source compounds.