TGA Warning on Imported Supplements: What It Means for Australians

If you regularly shop for supplements through international websites or online marketplaces, a series of TGA warnings issued in late 2025 are worth understanding in detail. Australian regulators identified toxic substances in products that were marketed as natural, herbal, or performance-enhancing — including some sold through well-known platforms that ship to Australia.

The issue is not limited to obscure products. Testing found problems in supplements that had significant sales and positive reviews. Understanding what the TGA found — and what it means for your buying decisions — is more useful than simply being told to "buy Australian".

The short answer

The TGA has found toxic substances including heavy metals, undeclared pharmaceuticals, and banned stimulants in supplements sourced from overseas online retailers. Buying through Australian-registered products or brands that publish independent third-party Certificates of Analysis is the most reliable way to reduce this risk. An AUST L or AUST R number on the label is the baseline check.

What the research shows

The TGA's targeted testing program, which focuses on products entering Australia through postal and courier channels, has identified three main categories of contamination in imported supplements.

Undeclared pharmaceuticals are the most consistently found issue. The TGA has detected prescription-only medicines — including phosphodiesterase inhibitors in male performance products and sibutramine (a withdrawn weight-loss drug) in fat burners — present in supplements with no indication on the label. A 2023 analysis published in the British Journal of Clinical Pharmacology found that approximately 15% of sports supplements tested in multiple countries contained undeclared pharmaceutical substances.

Heavy metal contamination is especially common in products using plant-derived ingredients like herbal extracts, spirulina, and traditional medicine formulations. Lead, arsenic, cadmium, and mercury concentrations above TGA-permitted limits have been identified. This aligns with findings from the Clean Label Project's 2023 protein powder and greens supplement studies, which found lead in more than 50 of the 134 products tested.

Banned stimulants including DMAA (1,3-dimethylamylamine), DMBA, and various beta-methylphenethylamine analogues have been found in pre-workout and weight-loss products. These substances are not permitted in listed medicines in Australia. DMAA in particular has been associated with cardiovascular events including haemorrhagic stroke at doses achievable from supplement use, according to a 2019 review in Drug Testing and Analysis.

Why this matters practically

The regulatory gap is structural. Products sold legally in Australia as listed medicines (AUST L) have their label claims assessed by the TGA, but are not tested for contaminants before reaching shelves. Products sold without an AUST number — which includes most supplements shipped from overseas — have had no regulatory assessment at all.

The personal importation scheme allows Australians to import a 3-month supply of therapeutic goods for personal use, but this does not mean the products are safe or legal to use. The TGA's powers to intercept individual packages are limited, and enforcement focuses on commercial quantities. In practice, this means a significant volume of non-compliant product reaches consumers.

This is why independent third-party testing published as a Certificate of Analysis (CoA) matters. A current CoA from a NATA-accredited or ISO 17025-accredited laboratory confirms the specific batch you're buying was tested for heavy metals, microbial contamination, and (in the case of sports supplements) banned substances. See our guide on what supplement certifications actually mean for a comparison of HASTA, Informed Sport, NSF, and TGA listing.

What to look for

• AUST L or AUST R number on the label — verify at tga.gov.au if uncertain. No number means no TGA assessment.
• Published Certificate of Analysis — not just a badge, but an actual document with lab name, accreditation number, batch number, and test results. Reputable brands make these available on request or on their website.
• HASTA certification for sports supplements — HASTA (Human and Supplement Testing Australia) tests specifically against the WADA prohibited list and is the most rigorous AU-specific programme for this category.
• Avoid products that make unusually strong claims — "guaranteed results", "pharmaceutical grade", or heavily discounted imported products often signal regulatory non-compliance.
• Check the heavy metals in supplements guide for specific categories and brands with published testing data.

What to do

1. Check every supplement you currently take for an AUST L or AUST R number. If it's missing and the product was purchased through an overseas website, consider switching to a TGA-listed equivalent.
2. Search the TGA's Therapeutic Goods Register (tga.gov.au) to confirm any product's registration status — takes under 2 minutes per product.
3. For sports supplements or anything where contamination risk is higher, look for HASTA-certified products. The HASTA website publishes a list of certified products.
4. Request a CoA before purchasing from any brand that doesn't publish them prominently. A brand that won't share testing results is a meaningful signal about quality standards.
5. Browse the clean supplements collection for products we've assessed against these criteria.

Frequently asked questions

Are supplements bought overseas safe to use in Australia?

Not necessarily. The TGA has found supplements purchased from overseas online retailers — including some marketed as natural or herbal — that contained undeclared pharmaceutical drugs, heavy metals above safe limits, and banned stimulants. Products sold into Australia without TGA registration are not assessed for safety or purity before sale.

What toxic substances has the TGA found in imported supplements?

TGA testing has detected undeclared pharmaceutical compounds (including prescription-only medicines), heavy metals such as lead, arsenic, and mercury above permitted limits, and stimulants including sibutramine and DMAA that are prohibited in Australia. These substances are not listed on product labels.

How do I know if a supplement is TGA registered?

Every listed medicine sold legally in Australia carries an AUST L number on the label. Registered medicines carry an AUST R number. You can verify either using the TGA's Therapeutic Goods Register at tga.gov.au. Products sold through grey-market websites without these numbers have not been assessed by the TGA.

Is third-party testing the same as TGA registration?

No. TGA registration is a regulatory process specific to Australia. Third-party testing (from labs like Informed Sport, NSF, or HASTA) verifies specific batches for contaminants and label accuracy, but is separate from TGA registration. Ideally a supplement has both: TGA listing and a published Certificate of Analysis from an independent lab.

What should I do if I've been taking an imported supplement?

Check whether it carries an AUST L or AUST R number. If not, stop use and consult a doctor or pharmacist, particularly if you've noticed any unusual symptoms. You can report suspected adverse reactions to the TGA through their IRIS reporting portal at tga.gov.au.

Related guides

• Clean Supplements: The Complete Guide to Avoiding Heavy Metals, Fillers, and Contamination
• Heavy Metals in Supplements: The Testing Gap You Need to Know About
• Supplement Certifications: What NSF, USP, Informed Sport, and TGA Actually Mean