Sentences with word «pyrrolizidine»

Recently, reports of the toxic effects of pyrrolizidine alkaloids in comfrey have led some herbalists to be wary of using it internally.

For example, in Germany, there is a safety limit to the level of pyrrolizidine alkaloids allowed in butterbur products.

Some butterbur preparations do contain chemicals called pyrrolizidine alkaloids (PAs), which can damage the liver and cause other serious harm.

It is shown repeatedly that the general public is largely unaware of important consumer health protection topics, such as pyrrolizidine alkaloids in teas and honey, or wrongly classifies them as being of no concern, such as food hygiene in private households.

In contrast, only around 13 percent of respondents have heard of the natural contaminants pyrrolizidine alkaloids (PAs) in honey or tea — and only roughly one in three of those who have heard of PAs believe these substances pose a significant health risk.

Finally, many experts particularly caution against borage oil, which may contain pyrrolizidine alkaloids that are toxic to the liver.

The main concern with butterbur however is that if not prepared properly, it can be contaminated with pyrrolizidine alkaloids, which are carcinogenic; they can also cause liver and kidney damage.

«Our working group studies the evolution of pyrrolizidine alkaloids.

The raw herb as well as teas, extracts, and capsules made from the raw herb should not be used because they contain substances called pyrrolizidine alkaloids that can be toxic to the liver and kidneys and have been linked to cancer.

Contraindications: The plant (but not the oil) contains small amounts of pyrrolizidine alkaloids that may cause toxicity in the liver, and Borage should never be taken in large doses (many times the recommended amount) or for a long period of time.

In contrast, pyrrolizidine alkaloids (PAs) in tea or honey (13 %) and arsenic in rice and rice products (26 %) as relatively new consumer protection topics are only known to a minority of respondents.

«With regards to the warnings that comfrey can cause cancer and liver disease, most herbal practitioners point out that those results were from studies that isolated the pyrrolizidine alkaloids and fed or injected them into animal subjects in doses far higher than any typical usage of comfrey leaf, and that comfrey leaf has been regularly ingested by thousands of people around the world without reported ill effects.»

It is possible to remove the pyrrolizidine alkaloids from butterbur products.