How to recognize a counterfeit of Testosterone isocaproate
Testosterone isocaproate is almost never produced as a standalone drug, so on the illegal market it is most often sold as part of "Sustanon-type" mixtures. It is precisely this complexity that makes the product convenient for falsification: verifying whether it really contains four esters in the declared amounts is impossible without a laboratory. The editorial team examines what is known about the scale of counterfeiting and what to pay attention to.
The scale of the problem: what analyses show
A systematic review and meta-analysis by Magnolini and colleagues (2022) summarized the results of studies that analyzed anabolic steroids from the black market. The authors concluded that a significant proportion of samples did not match the label: a missing active substance, a different substance instead of the declared one, or an incorrect concentration.
Similar conclusions come from analyses of confiscated products. For example, in a study of drugs seized at the Swiss border (Weber et al., 2017), a significant number of samples contained substances or doses other than those stated. Even earlier, Graham and colleagues (2009) described counterfeits of doping drugs as a systemic phenomenon, not isolated cases.
The WHO regards falsified and substandard medicinal products as a global public health problem. For prescription hormones sold outside the pharmacy network this risk is maximal, since there is no independent control over production.
It is important to understand: even a "correct" composition does not guarantee safety. Illegal producers often do not comply with sterility standards, and the amount of active substance may vary from batch to batch.
Why mixtures of esters are often counterfeited
The original "Sustanon 250", according to its label, contains in 1 ml four esters: 30 mg of propionate, 60 mg of phenylpropionate, 60 mg of isocaproate and 100 mg of testosterone decanoate. Together this corresponds to about 176 mg of pure testosterone. Reproducing such a mixture is more expensive and more difficult than a solution of a single ester.
In practice, the following variants often occur in counterfeits: one cheaper ester instead of four, insufficient total concentration, other androgens instead of testosterone, or a complete absence of the hormone. Since a mixture by definition gives "blurred" pharmacokinetics, a person cannot determine by sensation what is in the ampoule.
A separate risk is the "lab" brands of underground producers. They copy the appearance of pharmaceutical packaging but have neither a license nor quality control. Nice packaging and a hologram say nothing about the contents of the ampoule.
Counterfeits of well-known pharmaceutical brands are also common: labels, batch numbers and even inserts are copied. Manufacturers of the originals periodically publish warnings about counterfeits, and regulatory authorities seize such batches.
External signs: what can and cannot be checked
An external inspection helps to filter out only the crudest counterfeits. Below are signs that should raise concern, but their absence does not mean the drug is genuine.
- Errors, blurred printing, mismatched fonts on the label and packaging.
- A missing or mismatched batch number, manufacturing date and expiry date.
- A missing insert, or an insert in a language other than that of the declared country.
- Cloudiness, sediment, foreign particles, crystals that do not dissolve at room temperature.
- An unusual color or smell of the solution, a loose vial cap.
- A price significantly lower than the average for a legal drug.
| Verification method | What it provides | Limitation |
|---|---|---|
| Inspection of the packaging | Detects crude counterfeits | Quality copies cannot be distinguished |
| Checking the batch with the manufacturer or regulator | Confirms the existence of the batch | The number is easy to copy |
| Colorimetric "test kits" | Roughly indicate the class of substance | Do not determine the concentration and composition of the mixture |
| Chromatography with mass spectrometry | Exact composition and amount of esters | An accredited laboratory is required |
Popular home "reagent" tests give only approximate information. They do not make it possible to establish whether the mixture contains exactly four esters, in what amount, and whether there are impurities or microbial contamination in the solution.
Laboratory testing
The only reliable way to determine the composition is analysis by gas or liquid chromatography combined with mass spectrometry. These methods separate the individual esters and measure their amounts. It is precisely these methods that forensic and anti-doping laboratories use in studies of confiscated samples.
However, even chemical analysis does not answer the question of sterility. For that, microbiological tests and an endotoxin test are needed, which are performed by pharmaceutical quality-control laboratories. For the ordinary consumer such analyses are practically inaccessible.
The result of analyzing a single vial does not guarantee the quality of the entire batch. In illegal production the contents may differ even between ampoules of the same batch, since there are no validated mixing and filling processes.
Given this, the only real guarantee of quality is obtaining the drug from a pharmacy on a doctor's prescription, with a traceable supply chain and state control.
The risks of a counterfeit product to health
The most acute risk is infectious. An injection of a non-sterile oil solution can cause an abscess, phlegmon, and in severe cases sepsis. Such complications require surgical treatment and antibiotics and leave scars.
A mismatched composition is also dangerous. If instead of testosterone the vial contains another androgen, a person may get unpredictable effects on the liver, lipids or psyche. And an unknown concentration makes any assessment of what exactly is happening in the body impossible.
A counterfeit also complicates medical care. A doctor who sees unusual test results cannot understand their cause if the patient does not know what they injected.
Any signs of infection at the injection site — redness, swelling, increasing pain, fever — are grounds for immediately seeing a doctor.
Editorial conclusions
On the illegal market, testosterone isocaproate is mostly sold as part of mixtures, and it is precisely such drugs that often do not match the label.
External signs help to filter out only crude counterfeits; the composition can be confirmed only by chromatography with mass spectrometry, and sterility only by microbiological tests.
The greatest danger of counterfeits is infectious complications and an unpredictable composition. The only reliable route is a prescription drug from a pharmacy.
We also recommend our materials on the legal status of testosterone isocaproate in Ukraine and the EU, on its interaction with alcohol and medications, and on the drug's effect on the skin.
References
- Magnolini R, Falcato L, Cremonesi A, Schori D, Bruggmann P. Fake anabolic androgenic steroids on the black market – a systematic review and meta-analysis on qualitative and quantitative analytical results found within the literature. BMC Public Health. 2022;22:1371.
- Weber C, Krug O, Kamber M, Thevis M. Qualitative and semiquantitative analysis of doping products seized at the Swiss border. Subst Use Misuse. 2017;52(6):742–753.
- Graham MR, Ryan P, Baker JS, et al. Counterfeiting in performance- and image-enhancing drugs. Drug Test Anal. 2009;1(3):135–142.
- World Health Organization. Substandard and falsified medical products. Fact sheet. Geneva: WHO.
- Sustanon 250 solution for injection. Summary of Product Characteristics. Electronic Medicines Compendium (UK).
- Pope HG Jr, Wood RI, Rogol A, et al. Adverse health consequences of performance-enhancing drugs: an Endocrine Society scientific statement. Endocr Rev. 2014;35(3):341–375.
Andriy Melnyk
A strength-sports coach and author of programs for beginner and intermediate levels. Writes about training planning.
