Feverfew Potency
Answered by: Conrad Richter
Question from: Nancy K. Davison
Posted on: February 14, 2002

What is the traditional potency rate of your Canadian Feverfew seeds? Is there any place on the website where I can research this information?

Our regular feverfew (S2480) has tested regularly at 0.4% parthenolide or higher. Our golden feverfew has tested at 0.6% parthenolide or higher. These are not guarantees, however, because many factors affect parthenolide content, including growing conditions, time of harvest, drying, processing and storage.

It is important to note that parthenolide is a only marker compound for feverfew. It may not have anything to do with the plant’s medicinal properties. At this time, it is unclear what the real medicinally active constituent is; so, in fact, there is no generally accepted measure of medicinal potency in feverfew at this time.

Parthenolide remains important to the herb industry for standardization purposes. And in Canada, the government set a minimum level of 0.2% for feverfew products registered under the DIN (drug information number) system.

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