What should you not do with comfrey?
Modern scientific studies have found some evidence to support comfrey’s use in treating minor wounds and joint pain, but oral preparations of the plant have also been linked to liver damage and cancer. You should never take comfrey by mouth. You should also avoid using it on open wounds.
Is comfrey poisonous to humans?
Comfrey has toxic substances that can cause severe liver damage and even death. You should never take comfrey by mouth. The toxic substances in comfrey can be absorbed by the skin. Even creams and ointments should be used for only a short time, and only under a doctor’s supervision.
Is comfrey a carcinogen?
Comfrey contains pyrrolizidine alkaloids that are both hepatotoxic and carcinogenic (13), and there is extensive literature concerning hepatotoxicity with use of oral comfrey (5) (6) (7) (8) (9) (10).
Is comfrey plant poisonous to dogs?
The Merck Veterinary Manual lists comfrey as an especially risky herb because of its pyrrolizidine alkaloids, which have been linked to liver damage. The alkaloids are actually produced by the herb to fend off bugs, but the insecticide can be harmful to a dog.
How do you use comfrey in the garden?
Use as a mulch. Chop up comfrey leaves with grass cuttings, and place a 5cm layer on the surface of the soil around all plants. This will slowly rot down to provide nutrients, and act as a mulch to keep in moisture and help control weeds. Add fresh cut leaves to your leaf mould heap.
Why is comfrey toxic?
When taken by mouth: Comfrey is LIKELY UNSAFE for anyone when taken by mouth. It contains chemicals (pyrrolizidine alkaloids, PAs) that can cause liver damage, lung damage, and cancer. The FDA has recommended that all oral comfrey products be removed from the market.
Is comfrey illegal to grow in the US?
Why is Comfrey Illegal in the US? Comfrey contains pyrrolizidine alkaloids, which are naturally occurring plant toxins. If consumed in large amounts, these can be toxic to the liver. In 2001, the Food and Drug Administration advised dietary supplement manufacturers to remove comfrey products from the market.
Is comfrey banned in the US?
The pyrrolizidine alkaloids in comfrey can cause severe liver damage, liver cancer, mutagenicity, and even death. [8,9] For this reason, the U.S. Food and Drug Administration has banned the sale of oral comfrey products in the United States.
Is comfrey toxic to cats?
Comfrey (Symphytum officinale) is sometimes used as an herbal medicine for people, but it can cause liver damage when given to cats.