Essiac Tea and Oxalic Acid


Most information about oxalic acid and Essiac tea on the internet will give warnings about it, especially in relation to kidney problems, which we will cover in this article.

Fortunately, this article will present a more unbiased approach about the subject that is not based upon propaganda from Big Medicine, Big Pharma, Big Ag, and Big “Science”. In fact you may be shocked to discover that we have been lied to BIG TIME.

First of all, oxalic acid (aka, oxalate) is found in many foods found in Nature that most people eat everyday without any negative consequences or adverse reactions.

These foods include: spinach, kale, beets, apples, almonds, asparagus, avocados, beans, broccoli, cabbage, carrots, cashews, celery, chard, chives, chocolate, collards, cilantro, dates, eggplant, garlic, ginger root, kiwi, lentils, mangos, millet, mushrooms, nuts, oats, olives, peanuts, parsley, peas, peppers, potatoes, pumpkin, quinoa, radish, raspberries, rhubarb, brown rice, soybeans, squash, sweet potato, tomatoes, etc, etc.

Okay, so do you get the picture? If you are a human being and you eat, it’s virtually impossible to avoid eating foods containing oxalic acid.


Of course, if you ingest pure oxalic acid made in a laboratory it’s going to harm you or kill you. Likewise, cyanide made in a laboratory will kill you but cyanide compounds exist in food like brown rice, barley, flax seeds, millet, quinoa, lentils beans, blackberries, raspberries, walnuts, almonds, cashews, spinach, alfalfa sprouts, beet greens, apricot pits, brewer’s yeast, grape seeds, apple seeds, etc.

So when we eat foods from Nature it contains many kinds of atoms and molecules that when consumed alone as a laboratory chemical they are toxic. However, in a natural plant it has a synergistic* effect that acts in very complex ways to create a healthy body. We are only beginning to understand these extremely complex ways that the body heals itself with natural, organic food.  [*synergistic: working together for enhanced effect]

The two herbs in Essiac tea that specifically contain oxalic acid are sheep sorrel (Rumex acetosella) and Turkish (Chinese) rhubarb (Rheum palmatum tanguticum).

And here’s the shocker: Oxalic acid is one of the main reasons why Essiac tea is effective against cancer!

I am in my mid-70s and I have been drinking Essiac tea on a daily basis for twenty-two years and have never had any kidney issues and I have no cancer. I drink Essiac tea that is four times stronger than what Rene Caisse recommended for cancer patients.

It is no secret why Big Medicine, Big Pharma and the unconstitutional US government want to keep this information from us and it’s measured in billions and now even trillions of dollars.  This information is available in a short book entitled:

OXALIC ACID: God’s Natural Chemotherapy;

CANCER: The Cure Is In Food;

By Francis J. Hart (aka, “Col. Joe”)

Although this book is out of print, books are still available on the internet, 2nd edition, January 1, 2004. A free PDF of this book is still available for reading, downloading and printing at:


First, let’s take a look at what Nurse Rene M. Caisse wrote over fifty years prior to Francis Hart’s research on oxalic acid:

In May of 1974 Rene Caisse wrote the following words to Dr. Chester Stock: "It took years to find out the one herb that actually worked on the growth itself [i.e., Sheep Sorrel]. The other herbs I used to purify the blood and throw off any infection thrown off by the malignant growth as it regressed." [ESSIAC: Secrets of Rene Caisse's Herbal Pharmacy, p. 23]

"The research showed Sheep Sorrel, the most acidic ingredient at pH 4.5, to be the one herb that had a directly destructive effect on cancerous cells. "We found that on mice inoculated with human carcinoma, the growth regressed until it was no longer invading living tissue after nine days of Essiac experiments."  [ESSIAC:  Secrets of Rene Caisse's Herbal Pharmacy, p. 23, 24]

Rene Caisse described this process in detail in the following three paragraphs:

"Most importantly, and this was verified in animal tests conducted at the Brusch Medical Center and other laboratories, it was discovered that one of the most dramatic effects of taking this remedy was its affinity for drawing all the cancer cells which had spread back to the original site at which point the tumor would first harden, then later it would soften, until it vanished altogether or more realistically, the tumor would decrease in size to where it could then be surgically removed with minimal complications.

"In certain cases and at certain stages of the disease, the cancer would act as if it were 'coming to a head', similar to an abscess. It would then break down and slough away. These people all reported that when the mass breaks, it isn't like pus but like a cottage cheese substance that comes away. Still other types will enlarge until the mass is localized, then loosen and reduce in size until there is nothing left, having been absorbed into and carried off by the blood stream and body waste.

"I found also that no matter where the malignancy may be in the human body, surgery would be much more successful after six to eight treatments of Essiac, followed by further treatments once a week after the operation for a period of three months; then there would be no recurrence of the tumor. In the case of breast cancers, the primary growth will usually invade the mammary gland of the opposite breast or the auxilla (armpit), or both. My treatment, I found, reduced the secondary growth into the primary mass, enlarging it for a time. When it became localized, it was encapsulated and could then be removed without danger of recurrence. In one instance, a patient with breast cancer was instructed by her doctor to have six Essiac treatments before undergoing surgery. After the fifth treatment, however, the cancer disappeared, with no recurrence." [THE ESSENCE OF ESSIAC, p. 124-5]

The following quotes are from Sheila Snow's and Mali Klein's book ESSIAC ESSENTIALS, p. 38.

"It is very important to use the dosage as recommended, which was based on more than 54 years' experience. Rene was very concerned about this, which is why she personally administered the dose to her patients. The herbs are very potent, and in particular Sheep Sorrel can have the effect of enlarging the tumor too quickly, so that it may burst, or a vital organ may be blocked because of its increase in size. Sometimes the tumors will soften, dissolve into small pieces and be eliminated through the bowel or the urinary tract. Cancer growths in the breast have been known to become encapsulated within six weeks to three months, and can then be removed surgically with little danger of metastasising in the future. Cancers of the oesophagus have also become encapsulated and removed cleanly and safely by surgery."

"Depending on special circumstances, very occasionally in her later years, she would sometimes advise an initial dose of one fluid ounce twice daily for the first five, ten or (rarely) thirty days before reducing to one fluid ounce a day. Rene was always very particular about this because she was aware that sometimes, when patients first began taking the Essiac formula, their tumours might enlarge suddenly as though they were gathering back the cancerous cells that had metastasised. When that happened, she either gave lighter doses or stopped treatment altogether for a time, to prevent a vital organ from becoming blocked. It all depended on the nature and position of the tumour. For example, primary brain tumours rarely metastasise and we have had no reports of this type of swelling when taking Essiac in these cases. Essiac should never be administered intravenously. During the early days of Rene's pioneering research, she found that only Sheep Sorrel could be injected intramuscularly as an individual herb."

Now read what Francis J. Harris stated in his book OXALIC ACID: GOD’S NATURAL CHEMOTHERAPY:

An interesting observation has been noted regarding cancerous tumors. After cleansing of the blood, a pattern develops regarding oxalic acid’s attack. The last or most recent tumor identified will be eliminated. The first or core tumor identified will be the last to be eliminated.

When oxalic acid attacks a tumor, cells are returned to solution, the tumor liquifies, softens, and then decreases in size. This cycle repeats until only a small benign lesion exists.

It may at times appear that the tumor has grown, which is normal during the process of liquidizing. Soon thereafter, the tumor will diminish in size until it is eliminated.

Balance is the key. Understanding what BLOCKS oxalic acid’s action in eliminating abnormal cells in the blood is of EQUAL IMPORTANCE.”

So there you have it—Confirmation of how oxalic acid can eliminate cancerous cells from the body. In Rene Caisse’s research it is the three herbs, Burdock Root, Slippery Elm and Turkey Rhubarb that support the organs that detox the body of the cancerous cells.

It is also important to note that Dr. Gabriel Cousens reported in his book RAINBOW GREEN LIVE FOOD CUISINE that the Essiac herbs sheep sorrel and slippery elm “are rich in the super-colloid minerals iridium, rhodium and gold. Also, Rene Caisse occasionally used watercress and bloodroot which also contain these three super-colloid minerals.

CAUTION:  Bloodroot is a very potent herb and must be used only in tiny amounts under the supervision of a naturopath who is very experienced in the use of bloodroot.  Dr. Gary Glum used a very tiny amount of bloodroot in his version of Essiac tea.

According to the Gale Encyclopedia of Alternative Medicine sheep sorrel has antitumor and anticancer properties.

It is also important to mention that sheep sorrel is a mineral-loving plant.  It can grow in a pile of just gravel without any organic soil or dirt whatsoever.  Sheep sorrel appears to have the ability to absorb minerals directly from pure sand or gravel and then transform those minerals into plant-based "colloidal" minerals that humans and animals can readily assimilate.


Normally, most people do not experience any kidney problems from drinking Essiac tea.  However, anyone who has a pre-existing kidney problem should consult an experienced and knowledgeable naturopath or naturopathic physician regarding increasing foods that contain higher amounts of oxalic acid, recognizing that we all have our own unique physiology and genetics.

It is very interesting that sheep sorrel also contains citric acid which can be a natural blocker of oxalic acid (see below).  So here we have another example of the synergy of plant chemistry.

Herbalist and Essiac historian Sheila Snow worked with Rene Caisse from 1974 to 1977.  Sheila Snow stated in her book THE ESSENCE OF ESSIAC that sheep sorrel roots need to be included in the Essiac formula.  She further stated regarding sheep sorrel roots:

A decoction [boiled tea] of the root alone helps check stomach hemorrhage and blood coughed up from the lungs, clear up a jaundice condition as the liver is cleansed, and assist the expulsion of gravel from the bladder or kidneys.”

Dr. N. W. Walker teaches us that the human body produces a small amount of organic oxalic acid every 24 hours and it is excreted through the kidneys.

"Dr. Edward E. Shook believes that oxalic acid is a powerful oxidizing acid that rouses the human system into activity.  It readily combines with calcium to aid in its digestive assimilation and stimulates the peristaltic action of the intestines, thus helping sluggish, prolapsed intestines to regain their normal function.  Oxalic acid seems to promote faster blood coagulation time, which makes it valuable for hemorrhages."

QUESTION:  "Should I take Essiac if I have kidney cancer?"

ANSWER:  "Yes, you can, as long as your Essiac is prepared in the right proportion and you take the correct dose of one fluid ounce a day.  We have had several reports of kidney cancers being successfully treated with Essiac."

"Essiac does not consist purely of oxalic acid.  Again, when the correct herbs are used at the correct dosage, we have found no reports of kidney damage, either past or present.  Mali [Klein] has taken Essiac almost continually as an experiment for over seven years, and her inborn weakness in her right kidney has shown no sign of deterioration."  [ESSIAC: Secrets of Rene Caisse's Herbal Pharmacy, p. 119]

Here is the advice from Francis Harris on potential kidney problems concerning oxalic acid:

An overload of oxalic acid in order to rid your body of cancer may result in a backache due to the irritation of the kidney. When this occurs, you are advised to take one (1) 100 milligram Vitamin B6 [pyridoxine] tablet. The backache will disappear when the pyridoxine flushes the oxalic acid from the kidney. Do not make a habit of this. The goal is to keep a highly effective level of oxalic acid in the blood. A slight reduction in oxalic acid foods will prevent the backache.”

Take the B6 only when and if the backache presents itself. Do not continue to take the B6 once the backache has been eliminated.”


Francis Harris stresses the importance of avoiding any mineral, plant, food, beverage, additive, or supplement that inhibits, reduces, or binds with or otherwise reduces or eliminates the beneficial effect of oxalic acid.

He lists five ways that BLOCKS oxalic acid from being available to fight cancer, viral and bacterial infection, and diseases of the vascular system:

1. Citric Acid [which is not the same as Vitamin C]

2. Free Calcium as in Cow Milk, Milk Products and Calcium Supplemented Foods

3. Exposure to high levels of Electric Magnetic Fields [EMF]

4. Foods high in Vitamin B6 [Pyridoxine]

5. Alcohol

This means, of course, that one needs to read the ingredients of all food products and supplements.


According to the American Medical Association, drugs approved by the FDA kill over 100,000 Americans in hospitals every year!  According to a 174-page report by the U.S. National Poison Data System the number of people killed in 2009 across America by vitamins, minerals, amino acids or herbal supplements is exactly zero! 

Worldwide it is extremely rare that people are harmed by poisonous herbs.  The medical profession in 2020 is the third leading cause of death in the US.  

Please do not ask us to diagnose or treat any ailment as this should be done by a competent, experienced naturopathic doctor or nutrition-oriented medical doctor who has personally examined you.  It is important to remember that each individual's body has specific requirements for nutrition.  Therefore, the information offered on this web site is for historical and general information only and not to be construed as medical advice or treatment for anyone.  The use of herbs and other natural remedies is a natural right.  We assert that each individual human being owns his or her own body and no government has the right to usurp that ownership.  No mere statute or regulation can take away a human right.


“Their fruit will serve for food and their leaves for healing.”  Ezekiel 47:12. 


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