Ghislaine Morin
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Overview

The risk is real and documented, but it is not a fatality. It becomes manageable when the plant is identified, the batch traced, the patient's treatment known and the prescriber trained.

Where this idea comes from

It has one precise medical origin: the so-called Chinese herb nephropathy affair. In the 1990s, a slimming formula containing Aristolochia fangchi caused rapidly progressive kidney failure in Belgium, and several patients later developed urinary tract cancer.
Aristolochic acid is now classified as carcinogenic to humans by the International Agency for Research on Cancer, and its presence in medicines has been banned in Europe since the early 2000s. This is the strongest documented case, and it deserves to be told rather than minimised.
The idea is then amplified by online trade: capsules sold without a prescription, without a species name, sometimes without a batch number, often from countries with no pharmacovigilance. The problem is not the plant, it is the supply chain.

What Chinese medicine says

In TCM, herbal medicine is not a shelf of "natural plants": it is a prescription. The classical materia medica classifies plants by nature, action, dose, preparation and contraindication, including a category of toxic plants reserved for precise indications and supervised use.
Two principles limit the risk. First, the diagnosis: only a complete pattern identification justifies a formula, which excludes buying a ready-made blend for a self-diagnosed symptom. Second, the combination: a formula is built to balance its own effects, not to pile up active plants.
The tradition also distinguishes between the raw plant, the prepared plant and the extract. A practitioner who cannot name the species, the part used and the batch is not practising herbal medicine; they are distributing a product.

What the research says

The review by Debelle, Vanherweghem and Nortier (Kidney Int, 2008) describes aristolochic acid nephropathy as a worldwide problem, not a Belgian accident, with cases reported wherever contaminated batches circulated.
The narrative review by Gökmen et al. (Ann Intern Med, 2013) documents the epidemiology, diagnosis and management of the disease, and insists on the need for a precise botanical identification of herbal products.
Beyond contamination, interactions are the second documented risk: some Chinese plants modify blood clotting or the metabolism of drugs such as anticoagulants, immunosuppressants or cardiac treatments. The combination is not forbidden, it must be supervised.
What is established: contaminated or misidentified products cause serious harm. What is debated: the frequency of interactions in real practice. What is unknown: the exact composition of many products sold online.
Regulatory reality matters as much as toxicology. In France, a food supplement is declared rather than authorised, and the burden of proof lies with the seller only after a problem is reported. A product can therefore be legal and still contain the wrong species.

What to expect in practice

In practice, a supervised Chinese herbal prescription relies on a named species, a known supplier, a defined dose and a scheduled review. Any symptom appearing after starting a formula must be reported, not tolerated.
At the Centre Équilibre in Grenoble, Ghislaine Morin asks for the complete list of your medicines and supplements before any prescription, and refuses formulas she cannot trace. The TCM dispensary she organises there is also an opportunity to see how a herbal prescription is built, rather than bought.
Ask three questions before buying anything: which species, which plant part, which batch. A serious supplier answers in writing, with a certificate of analysis. An evasive answer is the most reliable warning sign available to a patient.

When to consult, and when not to

Always report anticoagulants, immunosuppressants, thyroid, cardiac or psychiatric treatments, and any known kidney or liver disease. Pregnancy, breastfeeding and planned surgery are also contraindications to discuss.
Never take a Chinese plant without identification of the species, and stop immediately in case of digestive upset, rash, jaundice, unusual fatigue or reduced urine output. Seek medical advice and bring the product with you.

Frequently asked questions

Are Chinese herbs sold online controlled?
Not in the same way as a medicine. A food supplement is declared, not authorised, and controls are lighter. The species, the batch and the contamination are often unverifiable. For herbal medicine, the pharmacy or a named supplier with a certificate of analysis is a safer route.
Can I take herbs with my medication?
Sometimes, but never without checking. Some plants affect blood clotting or the liver enzymes that metabolise drugs. The practitioner must know every treatment you take, and your doctor must know about the herbs. Neither should work in ignorance of the other.
Does TCM use toxic plants?
Yes, the Chinese pharmacopoeia includes them, and classical texts describe their doses and precautions. Their use requires training and supervision, and several are restricted or banned in Europe. A practitioner who presents them as harmless has no place in a serious protocol.

Frequently asked questions

Useful links

Sources

  • Gokmen MR, Cosyns JP, et al. The epidemiology, diagnosis, and management of aristolochic acid nephropathy: a narrative review. Ann Intern Med, 2013. https://pubmed.ncbi.nlm.nih.gov/23552405/ — https://pubmed.ncbi.nlm.nih.gov/23552405/
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Ghislaine Morin
Ghislaine Morin
Praticienne en médecine traditionnelle chinoise et sophrologue à Grenoble
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