an herb for concern?

[Guest guest]

I have become concerned about the possible toxicity of the herb called

shi chang pu / acorus rhizoma. While not traditionally considered

toxic, it has long been known that the herb contains a substance that

has been shown to be carcinogenic in lab rats and test tubes. However

it has never been proven toxic in humans in the form in which it is

used and unlike several other recent herbs of concern, this one has

sometimes been used for long periods.

 

The new bensky materia medica advises extreme caution when using most

asian species of acorus and advocates using the american species in

all cases, if possible. There are several reasons to dispute the

validity of this concern. The toxic component beta-asarone is not very

soluble in water. Thus, while present in the dried roots, it is

probably not present in the final decoction. Shi chang pu is also

mainly used in pills longterm. In that case, the dose is probably so

low as to prevent toxicity.

 

However, since this issue is now on the radar, it may be prudent to

substitute the American herb called calamus (sp: acorus calamus) in our

pharmacies. This variety has no beta-asarone and could thus be used

safely for any period of time. It is possible that golden flower has

already started carrying this herb as springwind is usually on top of

these things. I would be surprised if Steve Clavey, one of Bensky's

co-authors, would sign on to this substitution if it was not clinically

reasonable. I know it is one of his favorite herbs. Can anyone speak

to this substitution in terms of either biochemistry or traditional

usage. If there is no objection, then the substitution should probably

be made ASAP.

 

 

 

Chinese Herbs