Other: common comfrey, healing-herb, knitbone
Symphytum officinale L.
Plant Family: Boraginaceae
Comfrey leaf has been used since Roman times, dating back thousands of years. This herb has been utilized in folk medicine throughout Europe and North America and has been widely cultivated as a garden medicinal specifically for its reputation for healing various external wounds. Much debate surrounds the safety of comfrey due to various parts and preparations containing potentially toxic alkaloids. It is important to understand that the part used, species, and time of harvest all come in to play when determining the safety of this herb. A large body of traditional use supports its safety and efficacy if used intelligently and cautiously.2,4,5,6,7
A member of the Borage or Boraginaceae family, comfrey's relatives include both borage (Borago sp.) and heliotrope (Heliotropium sp.).8 The Symphytum genus contains about 35 species, all of which can be used interchangeably, although pyrrolizidine alkaloid content varies between species and are highest in Russian comfrey (S. x uplandicum) and prickly comfrey or (S. asperum).4 Comfrey has large, rough, hairy, and lance-shaped leaves with whitish, pink, or purple flower spikes which have a slight heliotrope like curl typical of this family.4,8 It is native to much of Europe, and various regions in Asia such as the Caucasus, Kazakhstan, Siberia, and Turkey,1 and is commonly found as a weed in temperate northern latitudes. The common name 'comfrey' is derived from the Latin 'con firma' alluding to this plants purported use of knitting bones back together, and the Greek word 'symphyo' which is the root of the generic name, Symphytum also meaning 'to unite.'2
Cultivation And Harvesting
The leaves and buds are best harvested when the flowers just start to bud.4 It is important to note that the pyrrolizidine alkaloid content of the leaf varies throughout the season.8 Early spring harvests reveal the highest alkaloid content and leaves harvested later in the season having much smaller amounts.4 The long dark taproot (highest in pyrrolizidine alkaloids),8 growing up to 6 feet long, can be harvested in the spring or fall, and if any root remnants are left behind, another comfrey plant most likely will spring up.4
History And Folklore
Comfrey's attributes were mentioned by many of the herbalist-alchemists of old such as Dioscorides (a Greek physician pharmacologist and botanist, practicing in 1st century Rome) and Paracelsus (a 15th century Swiss Renaissance physician, botanist, alchemist, and astrologer).5 It was recommended for wounds by St. Hildegard of Bingen, a herbalist and nun born in 1098 C.E. It was cultivated in gardens for centuries, its popularity giving rise to myriad common names. Many references were made to comfrey's healing properties in various herbals in the 16th and 17th centuries.
Traditionally in Europe, the leaf was used in cases of sprains or strains or broken bones.
Flavor Notes And Energetics
Energetically moist and cooling9
Vulnerary,2 emollient, astringent, expectorant, demulcent,8 hemostatic11
Uses And Preparations
Dried leaf as a salve.
Dried leaf and root infused in carrier oil for topical use
Specific: Not for internal use. Do not apply to broken or abraded skin. Do not use when nursing.
General: We recommend that you consult with a qualified healthcare practitioner before using herbal products, particularly if you are pregnant, nursing, or on any medications.
- United States Department of Agriculture Agricultural Research Service, Beltsville Area Germplasm Resources Information Network (GRIN). Accessed at http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?40944#syn on September 19, 2014.
- Grieve M. A Modern Herbal. New York: Dover Publications, Inc. Accessed at http://botanical.com/botanical on September 19, 2014.
- Cunningham, S. Cunningham's Encyclopedia of Magical Herbs. Woodbury: Llewellyn Publications; 2000.
- Foster, S. Herbal Renaissance. Utah: Peregine Smith Books; 1984.
- Gladstar, R. Herbal Healing for Woman. New York: Fireside Publishing; 1993.
- Green, J. (2011). The Herbal Medicine-Maker's Handbook: A Home Manual. Random House LLC.
- Mills S, Bone K. Principles and Practice of Phytotherapy: Modern Herbal Medicine. Edinburgh: Churchill Livingstone; 2000.
- Elpel, T. J. (2004). Botany in a Day.
- Tierra M. Integrating the Traditional Chinese Understanding of the Kidneys into Western Herbalism. Gateway to Chinese medicine, health, and wellness. Accessed at: http://www.acupuncture.com/herbs/tcmkidney.htm on September 17th, 2014.
- Wikipedia. The Free Encyclopedia. Allantoin. Accessed at: http://en.wikipedia.org/wiki/Allantoin#cite_note-5 on September 17, 2014.
- Leung AY, Foster S, eds. Encyclopedia of Common Natural Ingredients Used in Food, Drugs, and Cosmetics. 2nd ed. New York: John Wiley and Sons, Inc; 1996.
- Duke J. A. Phytochemical and Ethnobotanical Databases. Accessed at http://www.ars-grin.gov/duke/ on September 17, 2014.
Safety Issues Affecting Herbs: Pyrrolizidine Alkaloids by Subhuti Dharmananda, Ph.D., Director, Institute for Traditional Medicine, Portland, Oregon http://www.itmonline.org/arts/pas.htm
For educational purposes only. This information has not been evaluated by the Food and Drug Administration.
This information is not intended to diagnose, treat, cure, or prevent any disease.