Is comfrey safe for humans
Emily Dawson
Published Apr 04, 2026
It’s considered unsafe, due to the pyrrolizidine alkaloids that comfrey contains. These are dangerous chemicals that can cause cancer, severe liver damage, and even death when you consume them. For this reason, the Food and Drug Administration and European countries have banned oral comfrey products.
Can you touch comfrey?
Widely adapted and easy to grow, comfrey (Symphytum species) originated as a woodland wildflower of Europe and Asia. Various medicinal uses for comfrey date back 2,400 years, and no wonder. If you cut a stem and touch it to your tongue, you can taste a tingle, as if the sap is alive.
What does comfrey do to liver?
As noted above, comfrey contains substances called pyrrolizidine alkaloids that are both toxic to the liver and carcinogenic. The main form of liver disease seen with comfrey is a blockage of small veins that can lead to liver cirrhosis and eventually liver failure (hepato-occlusive disease).
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).What can I do with comfrey?
- Vigorous comfrey plants regrow after greens are harvested for compost or mulch.
- Garlic is tucked in with a double mulch of chopped comfrey and rotted hay.
- A comfrey root poultice can speed healing of sprains and bruises.
- Use dried leaves to make comfrey tea for houseplants.
Is comfrey Cream safe to use?
The FDA has recommended that all oral comfrey products be removed from the market. When applied to the skin: When applied to unbroken skin in small amounts for less than 10 days, comfrey is POSSIBLY SAFE for most people. It’s important to remember that the poisonous chemicals in comfrey can pass through the skin.
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.
Can chickens eat comfrey?
“Comfrey is well-suited as a feed for chickens. Chickens’ digestive systems are not equipped to handle much fiber. Comfrey is low in fiber and high in protein and minerals, especially when cut regularly.Is comfrey 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.
Is comfrey poisonous to livestock?Comfrey is Safe for Farm Animals “Comfrey does contain pyrrolizidine alkaloids which have the potential for liver damage. There have been warnings put out against the use of the herb, but evidence of incontrovertible documented toxicity is lacking.”
Article first time published onIs comfrey toxic to sheep?
Livestock Feed. You wouldn’t think animals would not like to eat comfrey because of the tiny hairs on comfrey leaves, but sheep, pigs and chickens don’t mind. Even rabbits and cattle will eat comfrey when it’s wilted or dried as hay, according to the University of Minnesota Agricultural Experiment Station.
Is comfrey good for tendons?
A herbal practitioner survey of the external use of comfrey in the United Kingdom indicated that comfrey is rated most effective for fractures, wounds, post-surgery healing, and problems with tendon, ligament, and muscle; while it is less effective for treating boils, hemorrhoids, and varicose veins (Frost et al., 2014 …
Why is comfrey good for compost?
Adding leaves of the comfrey plant to a compost heap gives the compost added nitrogen, resulting in increased microbial decomposition of the compost. The addition of too much comfrey will result in an imbalance in the carbon: nitrogen of the compost, and can actually slow the decomposition rate.
Does comfrey grow in South Africa?
Comfrey is Banned in Foodstuffs Let’s start with comfrey’s status as a banned herb in South Africa as reported by one of our daily newspapers. … Comfrey contains a class of substances called pyrrolizidine alkoloids or PA’s for short.
Is comfrey good for wrinkles?
Comfrey is considered to be an essential anti-aging ingredient, because it contains both allantoin and rosmarinic acid. Allantoin promotes the growth of new skin cells and rosmarinic acid acts as a painkiller and reduces inflammation. Comfrey softens skin and reduces the appearance of fine lines and wrinkles.
Are borage and comfrey the same thing?
Borage flowers are always blue while comfrey flowers bloom in white, pink and purple. The flowers have different shapes, as well, with comfrey flowers shaped like bells and borage flowers like stars. These two plants come from the same family, however, and look quite similar to each other when they aren’t blooming.
Is comfrey good for tomatoes?
Comfrey has very deep roots, which means it extracts large quantities of nutrients from far below the soil’s surface, inaccessible to other plants. … It’s especially rich in potassium, making it the ideal feed to promote flowers and fruits in a range of plants, including tomatoes.
Is comfrey good for bees?
Comfrey. Comfrey’s not just great for honeybees, but it also attracts pollinators like bumblebees. These vigorous plants can also be used to make comfrey feed and comfrey ointment.
Why do dogs eat comfrey?
Comfrey can relieve pain and produce anti-inflammatory properties that can help your dog manage joint pain. Although comfrey also contains pyrrolizidine alkaloids, primarily on the root, which cause liver problems when ingested in large quantities. … It has anti-inflammatory and antioxidant properties.
How is comfrey invasive?
Most comfrey plants can be somewhat invasive spreading via seed, to parts of the garden where they are not wanted. ‘Bocking 14’ will flower and provide nectar and pollen but will not produce viable seed. The first flowers of spring.
What does comfrey heal?
Comfrey is an herbal supplement used for conditions such as bronchitis, bruises (topical use), cancer, cough (persistent), fractures (topical use), peptic ulcer, rheumatism, skin ulcers (topical use), sprains (topical use), wound healing (topical use), gastritis, ulcers, excessive menstrual flow, and to gargle for gum …
Which is better comfrey root or leaf?
Comfrey is even believed to help decrease inflammation of tendon sheaths (Tilgner, 2018), supporting its use for joint sprains. While both comfrey leaf and root are well known for their mucilage content and associated demulcent action, the root is more demulcent than the leaf.
Why does comfrey stink?
Some comfrey tea recipes will tell you to add water at this stage, but that method will result in an almighty stink as the plethora of bacteria and microorganisms in the water get to work on digesting the comfrey and fart out all sorts of waste gases.
Is Comfrey poisonous to horses?
Comfrey contains a substance called allantoin which is why it is good for healing wounds, bone, cartilage and tissue. The leaves can be fed dried (20-30g a day) or bruised (one handful a day). When fed in excess comfrey can become toxic due to the presence of pyrrolizidine alkaloids, which are also present in ragwort.
Is Comfrey toxic to cats?
This herb has been reported to cause liver toxicity and liver cancer in laboratory animals.
Do horses like Comfrey?
The wide ranging actions of Comfrey make it one of the most useful for horses and their humans, especially for its ability to accelerate healing of fractures as well as bone, tendon and ligament damage and to promote cartilage repair in early arthritis and rheumatoid diseases.
Is comfrey good for cattle?
Great for Dairy Animals Comfrey is especially good for animals you are milking. It gives does, cows and ewes a nutritional boost. You can even dry it and then feed it to your animals in the winter. Some people say it improves milk production and increases the amount of cream in the milk (from the protein probably).
Is comfrey poisonous to hens?
Comfrey being low in fibre but high in protein is the ideal green to feed chickens. The allantoin is potentially health promoting and the high levels of Vitamins A & B12 results in both a rich yellow yolk to the eggs and a yellow tinge to the flesh as with the expensive corn-fed hens.
Is comfrey bad for rabbits?
I highly recommend comfrey for rabbits! It is a great digestive aid and will help with wool block, do not overfeed as it may cause diarrhea, this is the plant working use caution! … Comfrey is good for the stomach, and can be fed as a general gut tonic. Always use caution when feeding greens to rabbits!
Will deer eat comfrey?
Comfrey is a great plant to have outside of your orchard (or garden)fencing. Deer enjoy this plant almost as much as hosta, but they don’t eat it to the ground, more as a browse.
Do goats like comfrey?
There’s no doubt that our goats enjoy comfrey. I have patches here and there throughout the farm, and Abigail especially is always looking to grab a mouthful as she passes by. … They slurped up every leaf of all three types (while continuing to ignore the container of older comfrey leaves at their feet).