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Comfrey: assessing the low-dose health risk
1Toxicology Unit, Department of Community Services and Health, Canberra, ACT.
The Medical Journal of Australia
|December 5, 1988
Summary
Regular comfrey consumption poses health risks due to toxic pyrrolizidine alkaloids. Limiting intake is advised due to potential liver damage and tumor induction, emphasizing education on plant-derived chemical dangers.
Area of Science:
- Toxicology
- Phytochemistry
- Pharmacology
Background:
- Comfrey contains naturally occurring pyrrolizidine alkaloids (PAs).
- Pyrrolizidine alkaloids are known hepatotoxins in animals and humans.
- Some PAs have demonstrated carcinogenicity in experimental animal studies.
Purpose of the Study:
- To review the toxic properties of PAs found in comfrey.
- To evaluate the acute and long-term health risks associated with comfrey consumption.
- To discuss the implications for public health and regulatory controls.
Main Methods:
- Literature review of toxicological data on pyrrolizidine alkaloids.
- Analysis of comfrey's PA content and associated health risks.
- Evaluation of existing regulatory measures and educational needs.
Main Results:
- Comfrey consumption, even at low levels, presents a small but significant long-term health risk.
- Hepatotoxicity and potential tumor induction are key concerns linked to PAs in comfrey.
- Current data supports the need for controlled intake and increased public awareness.
Conclusions:
- The presence of toxic pyrrolizidine alkaloids in comfrey necessitates limiting its dietary and medicinal use.
- Regulatory controls and public education are crucial to mitigate the health risks of comfrey consumption.
- Further research into safe consumption levels and alternative sources may be warranted.