Blessed Thistle: Its Traditional Role in Essiac Tea
Burdock root is one of the best-known botanical ingredients associated with Essiac tea. Recognizable by its large leaves and distinctive burrs, burdock has a long history of use as both a food and an herbal ingredient in various parts of the world.
In Essiac, the root of the burdock plant specifically is used as part of a multi-herb formula rather than as a standalone ingredient. Understanding what burdock is, which part of the plant is used, and its traditional history can provide useful context for understanding the composition of Essiac tea.
What is Blessed Thistle?
Blessed thistle (Cnicus benedictus L.) is an annual flowering plant belonging to the Asteraceae family, the same broad botanical family that includes plants such as burdock, dandelion, chamomile, and artichoke.
The plant is also known by several other common names, including St. Benedict's thistle and holy thistle.
Blessed thistle produces yellow flowers surrounded by spiny leaves and bracts. Despite its name and appearance, it should not be confused with milk thistle (Silybum marianum), which is a different plant with a different botanical composition and history of use.
For traditional herbal preparations, the aerial—or above-ground—parts of blessed thistle are generally used. The European Medicines Agency describes blessed thistle herbal material as preparations derived from the above-ground portions of Cnicus benedictus.
A Plant with a Long History
Blessed thistle was used in European herbal traditions long before Essiac became associated with Canadian nurse René Caisse during the 20th century.
Its unusual common name reflects some of that history. The plant became sufficiently valued in traditional European herbalism that names such as "blessed thistle," "holy thistle," and "St. Benedict's thistle" became associated with it.
Historical herbal preparations commonly used the dried above-ground portions of the plant.
The European Medicines Agency has formally reviewed the historical use of Cnicus benedictus. Its herbal monograph recognizes traditional use of blessed thistle preparations for temporary loss of appetite and for the symptomatic relief of mild digestive complaints.
Importantly, the EMA classifies these as traditional uses based on long-standing use rather than conclusions established through modern clinical trials.
That distinction is useful when discussing herbs with centuries of history: traditional use and modern scientific evidence are two different types of information and should not be confused with one another.
Blessed Thistle and Essiac Tea
Blessed thistle is one of the additional botanicals found in the eight-herb Essiac formulation associated with the later development of the formula.
Today, products sold under the name Essiac do not necessarily contain identical ingredients. Some formulations contain four herbs, while other versions contain four additional botanical ingredients.
Genuine Essiac uses blessed thistle as one component of our complete eight-herb formula, alongside burdock root, sheep sorrel including the root, slippery elm bark, Turkish rhubarb root, red clover, watercress, and kelp.
Each botanical is included in a specific proportion as part of the complete blend.
Blessed thistle should therefore be understood as one component of Essiac rather than as a substitute for the complete formula.
Blessed Thistle Is Not Milk Thistle
One of the most important distinctions to make when discussing blessed thistle is that it is not the same plant as milk thistle.
Blessed thistle is Cnicus benedictus.
Milk thistle is Silybum marianum.
Although both plants belong to the Asteraceae family and both have "thistle" in their common names, they are botanically distinct plants.
This is one reason botanical names are so useful when evaluating herbal ingredients. Common names can sometimes refer to similar-sounding—or even entirely different—plants.
When discussing the blessed thistle used in Genuine Essiac, we are referring specifically to Cnicus benedictus. If you are sourcing blessed thistle, be sure to go by the latin name for accuracy.
What's Naturally Found in Blessed Thistle?
Like other botanical ingredients, blessed thistle contains a complex mixture of naturally occurring plant constituents.
One of its best-known constituents is cnicin, a naturally occurring sesquiterpene lactone associated with the plant's characteristically bitter taste.
Researchers have also identified other naturally occurring compounds in Cnicus benedictus, and the phytochemistry of the plant continues to be investigated.
The presence of a particular compound, however, does not establish that consuming the whole herb will produce a specific health outcome.
This distinction is especially important when reading herbal research. Experiments involving isolated compounds, concentrated extracts, cells in a laboratory, or animals are fundamentally different from consuming a dried botanical as one component of a multi-herb tea.
Traditional and Customary Uses of Blessed Thistle
Blessed thistle has a long history of use in traditional European herbalism. Historically, preparations made from the plant's above-ground portions have been used primarily in connection with appetite and digestion. The European Medicines Agency (EMA) recognizes the traditional use of blessed thistle for temporary loss of appetite and for the relief of mild digestive complaints. These uses are classified as traditional uses based on long-standing experience rather than evidence from modern clinical trials.
Digestive Use
Blessed thistle has traditionally been used as a bitter herb in connection with digestion. Its naturally bitter character is associated in part with cnicin, one of the plant's characteristic naturally occurring compounds.
Modern researchers have also examined the chemical composition and biological activity 1 of Cnicus benedictus extracts. These laboratory investigations provide additional information about the plant and its naturally occurring constituents, but they do not establish that consuming blessed thistle produces a particular digestive effect in people.
Traditional Use for Appetite
Blessed thistle also has a history of traditional use for temporary loss of appetite. This use is included in the European Medicines Agency's herbal monograph on Cnicus benedictus.
The EMA's designation is important to understand in context: it reflects evidence of long-standing traditional use rather than proof from controlled human clinical trials.
Other Areas of Scientific Interest
Modern researchers have investigated blessed thistle and individual compounds naturally present in the plant, including cnicin. Experimental studies have examined a variety of biological activities and mechanisms, including antioxidant and inflammatory pathways. Other preclinical research has investigated isolated cnicin in experimental models involving nerve regeneration. 2
A 2024 peer-reviewed review published in Planta Medica brought together research on the traditional uses, phytochemistry, and experimentally studied biological properties of Cnicus benedictus and several of its naturally occurring constituents. 3
This research helps scientists better understand blessed thistle and its chemistry, but much of it consists of laboratory, animal, computational, extract, or isolated-compound research rather than controlled human clinical trials. These findings should not be interpreted as evidence that consuming blessed thistle—or Genuine Essiac, an eight-herb botanical formula—will produce the same effects observed under experimental conditions.
Sourcing Blessed Thistle for Herbal Preparations
As with any botanical ingredient, quality involves more than simply seeing the words "blessed thistle" on an ingredient list.
Important considerations can include:
- Correct botanical identity
- Correct plant part
- Harvesting and processing practices
- Moisture and storage conditions
- Foreign material
- Microbial quality
- Potential environmental contaminants
Correct botanical identification is particularly important because blessed thistle can be confused with other plants carrying the word "thistle" in their common names.
For a multi-herb preparation such as Essiac, ingredient sourcing is only one part of the process. The identity and quality of each botanical matter, as do the proportions in which the ingredients are combined. Third-party batch testing of the completed formula provides another important layer of quality control.
For a multi-herb preparation such as Essiac, ingredient sourcing is only one part of the process. The identity and quality of each botanical ingredient matter, as do the proportions in which the ingredients are combined. Third-party batch testing of the final formula is also critical. Genuine Essiac sources our burdock root from highly reputable sources from within the U.S.
Blessed Thistle in the Genuine Essiac Formula
Genuine Essiac uses burdock root as one of eight botanical ingredients in our traditional Essiac blend.
Our complete formula contains:
- Burdock root
- Sheep sorrel, including root
- Slippery elm bark
- Turkish rhubarb root
- Red clover
- Watercress
- Blessed thistle
- Kelp
Rather than viewing burdock root—or any single ingredient—as equivalent to Essiac, it is more accurate to understand it as one component of a larger botanical formula.
That distinction is important when researching individual Essiac ingredients. Learning about each plant can help explain the composition and history of the formula, but information about an individual herb should not automatically be attributed to the complete blend.
Frequently Asked Questions About Burdock Root and Essiac
Blessed thistle is included in the eight-herb formula used by Genuine Essiac. Essiac formulations can differ, however, and not every product sold as Essiac contains the same eight botanical ingredients.
The botanical name is Cnicus benedictus L. It is also sometimes referred to by common names including St. Benedict's thistle and holy thistle.
No. Blessed thistle (Cnicus benedictus) and milk thistle (Silybum marianum) are different plants. Although both belong to the Asteraceae family and share "thistle" in their common names, they should not be considered interchangeable.
Traditional herbal preparations generally use the aerial, or above-ground, portions of Cnicus benedictus. The European Medicines Agency's herbal monograph likewise concerns the above-ground parts of the plant.
Cnicin is a naturally occurring plant compound found in blessed thistle and is one of the constituents associated with the plant's bitter character. Research involving cnicin should not be assumed to demonstrate the effects of consuming the whole herb or a multi-herb preparation containing blessed thistle.
Yes. Blessed thistle has a long history in European herbal traditions. The European Medicines Agency recognizes certain traditional uses of preparations made from the above-ground portions of Cnicus benedictus, while noting that these conclusions are based on long-standing traditional use rather than clinical trial evidence.
No. Blessed thistle is an individual botanical ingredient. Genuine Essiac is a multi-herb preparation containing blessed thistle along with seven other botanical ingredients.
Does research on blessed thistle prove that Essiac has the same effects?
No. Research involving blessed thistle, concentrated extracts, isolated compounds, laboratory models, or animal models cannot automatically be applied to a finished eight-herb Essiac tea. Each type of research needs to be considered in its proper context.
Understanding Blessed Thistle's Place in Essiac
Blessed thistle has a history extending well beyond its inclusion in Essiac. Its longstanding place in European herbal traditions, distinctive botanical characteristics, and naturally occurring plant compounds have all contributed to continued interest in Cnicus benedictus.
Its role in Essiac is best understood as one part of a multi-herb formula thas was expanded on during Rene Caisse and Dr. Charles Brusch's work from the years of 1959 through 1976. This information can be read in the book The Essiac Report by Richard Thomas.
Exploring each of the eight botanicals individually can provide a better understanding of what Genuine Essiac contains, how the ingredients differ from one another, and why details such as botanical identity, plant part, sourcing, and preparation matter.
Last Updated: 09/03/2026
1 Chemical and Bioactivity Evaluation of Eryngium planum and Cnicus benedictus Polyphenolic-Rich Extracts. Gabriela P, Elena N, Veronica M, Camelia A, Simona S, Gabriel LR.
2 Cnicin promotes functional nerve regeneration. Philipp G, Jeannette G, Marco L, Charlotte Z, Zhendong C, Dirk G, Dietmar F. Phytomedicine
. 2024 Jul:129:155641. doi: 10.1016/j.phymed.2024.155641. Epub 2024 Apr 14.
3 Cnicus benedictus: Folk Medicinal Uses, Biological Activities, and In Silico Screening of Main Phytochemical Constituents. Katarzyna Z, Dagmara M, Alicja N, Kamilla B.
4 Lin CC, et al. Anti-inflammatory and radical scavenge effects of Arctium lappa. American Journal of Chinese Medicine. 1996;24(2):127–137.
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About the Author
Bryan Paulhus
Founder & CEO, Genuine Essiac
Bryan Paulhus is the Founder & CEO of Genuine Essiac. For more than 40 years, he has researched the authentic 8-herb Essiac formula and writes to help readers better understand its history, preparation, and quality standards.
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