# Cascara Sagrada

Category: Drugs & Compounds

Also known as: cascara, emodin

Cascara sagrada is a plant laxative whose therapeutic value, according to Ray Peat, depends entirely on proper aging to eliminate its irritant properties. When unaged, it causes overstimulation, irritation, and cramping, but when aged to a color darker than chocolate, it…

10 passages · 1 author · 2009–2022 · Most-cited: [Ray Peat](https://bioenergeticoracle.com/md/voices/ray-peat/index.md)

Canonical page: https://bioenergeticoracle.com/concepts/cascara-sagrada

## Synthesis

**Cascara sagrada** is a plant laxative whose therapeutic value, according to Ray Peat, depends entirely on proper aging to eliminate its irritant properties. [Source 1, 4] When unaged, it causes *overstimulation, irritation, and cramping*, but when aged to a color darker than chocolate, it becomes anti-inflammatory and sedative, increasing water secretion into the intestine to soften stool without the purging effect. [Source 1, 4] Peat emphasized that the taste itself is important for its action, and that individual sensitivity varies enormously, with a mere taste capable of stimulating the entire digestive system. [Source 5]

The primary active constituent is **emodin**, an anthraquinone that Peat identified as structurally analogous to **vitamin K**, **coenzyme Q10**, and **tetracycline**, sharing their anti-inflammatory, anti-cancer, and anti-stress properties. [Source 3, 8] Peat’s research interest in emodin originated from his graduate work on oxidative metabolism, where he found that colored plant compounds could simulate mitochondrial respiration. [Source 4] He described emodin as reinforcing all of the body’s own defense systems, increasing energy production the way thyroid and progesterone do, while specifically blocking the *coronavirus spike protein* and the angiotensin-converting enzyme. [Source 7, 8] Its anti-cancer mechanisms include lowering **hypoxia inducible factor 1 alpha (HIF-1α)** and attenuating the expression of collagenase enzymes involved in metastasis, as well as a more fundamental epigenetic reprogramming through *demethylation* and inhibition of histone deacetylase enzymes. [Source 2, 10]

Peat detailed a regulatory history in which the FDA removed cascara from the market as a laxative by labeling it a potential carcinogen, a move he argued was timed to clear the market for the synthetic drug Zelnorm. [Source 1, 6, 9] Zelnorm acted by intensifying serotonin signaling to force bowel movements, but this spastic stimulation chronically deprived the intestine of oxygen, leading to colon death and necessitating surgical removal in many patients before the drug itself was withdrawn. [Source 1, 6, 9] Peat noted that the pharmaceutical industry was simultaneously investigating emodin as a promising cancer treatment, and that the carcinogen accusation was never supported by research but was instead part of a campaign against natural substances. [Source 6, 9, 10] He also clarified that the brown pigmented colon sometimes observed in laxative users was actually caused by the underlying constipation and irritation, not by the proper use of cascara. [Source 9]

Peat considered cascara a tool for reducing inflammation and constipation while identifying and correcting the underlying cause, which he most often attributed to **hypothyroidism** slowing all digestive secretions and peristalsis. [Source 9] He stated that people have taken it daily for decades without harm, and that in serious conditions like advanced kidney failure, its restorative effects on mitochondrial respiration and kidney function far outweigh any concern about its laxative action. [Source 7, 9] He recommended a typical tablet size of 500 mg, but noted that even a quarter of that was excessive for many, and that the laxative effect usually takes about eight hours. [Source 5]

## People also ask

### How does aging cascara sagrada change its effects on the gut?

Peat argued that unaged cascara causes irritation and cramping, but when aged to a color darker than chocolate it becomes anti-inflammatory and sedative, softening stool by increasing water secretion without a purging effect.

### What role does emodin play in cascara's anti-cancer properties?

The corpus describes emodin as lowering HIF-1α, attenuating collagenase enzymes involved in metastasis, and promoting epigenetic reprogramming through demethylation and inhibition of histone deacetylase enzymes.

### Why did Peat believe the FDA removed cascara from the market?

Peat argued the FDA labeled cascara a potential carcinogen to clear the market for the synthetic drug Zelnorm, a move he claimed was unsupported by research and part of a campaign against natural substances.

## Related concepts

- [Constipation](https://bioenergeticoracle.com/md/concepts/constipation/index.md)
- [Albumin](https://bioenergeticoracle.com/md/concepts/albumin/index.md)
- [Anxiety](https://bioenergeticoracle.com/md/concepts/anxiety/index.md)
- [Aspirin](https://bioenergeticoracle.com/md/concepts/aspirin/index.md)
- [Cancer metabolism](https://bioenergeticoracle.com/md/concepts/cancer-metabolism/index.md)
- [Cellular respiration](https://bioenergeticoracle.com/md/concepts/cellular-respiration/index.md)

## Cited passages

Passage numbers match the `[Source N]` markers in the synthesis above.

### Source 1 — One Radio Network: Ray Peat with Patrick Timpone — February 21, 2022

Ray Peat · Interview · Feb 21, 2022

> **Patrick Timpone:** So, Lily, you're suggesting she look at her thyroid carefully, make sure her TSH is like 0.5 or below.
>
> **Ray Peat:** Yeah, and checking body temperature and pulse rate.
>
> **Patrick Timpone:** And for a woman her age, she's 45, good pulse rate would be in the neighborhood of...
>
> **Ray Peat:** It should be... In the 70s when waking up and then during normal daily activity in the 80s.
>
> **Patrick Timpone:** Different for guys?
>
> **Ray Peat:** What was that?
>
> **Patrick Timpone:** Different for men?
>
> **Ray Peat:** Oh, not very different, but women have smaller hearts generally and so slightly faster pulse.
>
> **Patrick Timpone:** Dr. Peat, do you know of any bad effects from taking cascara sagrada? What are the benefits? Thank you.
>
> **Ray Peat:** If it hasn't been properly aged, it causes overstimulation, irritation, cramping, considerable pain. But when it's very well aged and is darker than chocolate, approaching the dark roast coffee color, then it doesn't have that... stimulating cramping effect. What it does is reduce inflammation and increase the flow of water through the intestine to soften the stool or prevent over dehydration of the stool. And the FDA several years ago took it off the market as a laxative. At that time, the pharmaceutical industry was investigating it, discovering that its main active ingredient, Imodin, was very promising as a cancer treatment. But the FDA used the excuse of calling it a possible carcinogen to take it off the market because they wanted to promote a pharmaceutical product they thought, better equivalent, except it turned out that the maximum safe, so-called safe use period was only five or six months. And at the end of that time, they said, then you have to find some other laxative. But they had taken Casper off the market, so the real alternative didn't exist. And it turned out that Very quickly, they took this new laxative proprietary chemical off the market because it was causing death of the colon.

### Source 2 — Cancer: Disorder and Energy

Ray Peat · Article · 2014 · https://raypeat.com/articles/articles/cancer-disorder-energy.shtml

> When we eat more carbohydrate than can be oxidized, some of it will be turned into saturated fats and omega-9 fats, and these will support mitochondrial energy production. Carbohydrates in the diet also help to decrease the mobilization of fatty acids from storage; niacinamide and aspirin support that effect. Sugars are probably more favorable than starches for the immune system (Harris, et al., 1999), and failure of the immune system is a common feature of cancer. Polyunsaturated fats are generally known to suppress the immune system. Foods that provide generous amounts of sodium, calcium, magnesium, and potassium, help to minimize stress. Trace minerals and vitamins are important, but can be harmful if used excessively—iron excess is important to avoid.
>
> Emodin, an anti-inflammatory substance found in cascara sagrada bark and other plants, is similar to other molecules that have been used for treating cancer, and one of its effects is to lower HIF: "Consistently, emodin attenuated the expression of cyclooxygenase 2 (COX-2), VEGF, hypoxia inducible factor 1 alpha (HIF-1α), MMP-1 and MMP-13 at mRNA level in IL-1β and LPS-treated synoviocytes under hypoxia" (Ha, et al., 2011). MMP-1 and MMP-13 are collagenase enzymes involved in metastasis. When cells are fully nourished, supplied with protective hormones, and properly illuminated, their ability to communicate should be able to govern their movements, preventing—and possibly reversing—metastatic migration.
>
> [references]

### Source 3 — KMUD Aging and Energy Reversal 2013

Ray Peat · Interview · 2013 · https://www.youtube.com/watch?v=HYV6mgImPhs

> **Ray Peat:** I think it works by itself or with any of the other protective inhibitors. Caffeine has some of the same effects. And Aspirin and caffeine have been used together in a lot of products. So a combination. All of these seem to work synergistically rather than interfering with each other.
>
> **Andrew Murray:** I think we want to move on to the anthraquinones as a pretty interesting group of chemicals. I know pau d'arco is been one of these chemicals that has got a long history of anti-cancer use. But talk about emodin as a compound. This anthraquinone, the chemical that gives the reddish color to those types of chemicals that have that laxative effect, so both cascara and emodin and how they work.
>
> **Ray Peat:** If you look at the molecule for pau d'arco or, is that the same as lapacho?
>
> **Andrew Murray:** Yeah.
>
> **Ray Peat:** If you put vitamin K and emodin and lapacho in a row and tetracycline (the antibiotic which is an anti-inflammatory), they're essentially the same structure with a different number of rings. But it's like each one is an analog of the other and each one has properties overlapping with those of the other — anti-inflammatory, anti-cancer, anti-stress.

### Source 4 — Ask the Herb Doctor: You Are What You Eat (2014)

Ray Peat · Interview · 2014 · https://www.youtube.com/watch?v=CxsSVCclRyI

> **Caller:** Emodin - am I right in thinking that Emodin is also present in Aloe Vera.
>
> **Ray Peat:** Yes, in lots of plants. Generally, they're a laxative plant, but it isn't the typical purging kind of a laxative. If the Cascara isn't properly aged, it does have an irritating purging effect, but aging makes it insoluble in water, comparatively, and it loses the irritating inflammatory property and becomes anti-inflammatory and sedative and it actually increases the production of energy while having a nerve calming sedative effect.
>
> **Caller:** And this again is that red compound that you've mentioned in the past that is energetic favorable in terms of its...both, electron quenching activity and its anti-inflammatory activity.

### Source 5 — Ray Peat Email Advice Depository — Post 830

Ray Peat · Email · Dec 3, 2022

> **Question:** Hi Dr. Peat How does one take cascara sagrada? How many mg is optimal? In food/drink? On an empty stomach? Much love
>
> **Ray Peat:** People vary tremendously in their response to it. A common tablet size was 500 mg, but even a fourth of that was much more than enough for many people. A mere taste of it can stimulate the whole digestive system.
>
> **Question:** I've dissolved a a .15CC scoop in hot water and drank it I've heard just now that you like to put a bit on your tongue and then drink milk. Do you think there are more benefits to the way you consume it?
>
> **Ray Peat:** The taste is important, so the water should be effective. It usually takes about 8 hours for the laxative effect.

### Source 6 — [RELEASED 2019] Politics & Science: Digestion

Ray Peat · Interview · Apr 26, 2010

> ## Laxatives, Emodin, and the FDA
>
> **John Barkhausen:** So doctors were using Cascara Sagrada and Aloe?
>
> **Ray Peat:** Yes. An old laxative called "Nature's Remedy" contained just aloe and cascara for about a hundred years. About 20 years ago, the cancer drug industry started researching chemicals in the same family as the active ingredient of aloe and cascara—anthraquinones. One of these was effective at killing cancer, but it would kill the heart. It was a synthetic derivative. When this cancer drug was found to kill the heart, research led them to reinvestigate the natural substances. It turns out that Emodin is a good cancer drug, and it doesn't kill your heart. But it's a natural substance. They are still working on how to make a synthetic, patentable version they can sell. Because of the cancer industry's involvement, the FDA began putting out warnings that the natural substance might cause cancer because it vaguely resembles compounds that do. There was never research to support that, but the FDA used that cancer risk to outlaw the natural substances sold as laxatives. Coincidentally, within weeks of using that argument, they granted approval to a drug called Zelnorm. This was a synthetic that intensified the serotonin effect to simply overstimulate the intestine. The FDA approved a synthetic that was nothing but a very powerful stimulant simultaneously with taking the natural laxatives off the market. The market was wide open for Zelnorm to be sold at three or four dollars per tablet. They were making something like a billion dollars a year until too many people started having their colons or other parts of their intestine die and have to be removed.

### Source 7 — Link to the audio version: Ray Peat Interview - KMUD - March 19th, 2021

Ray Peat · Interview · Mar 19, 2021

> **Ray Peat:** There are some good publications showing that the inflammation due to air pollution does make you more susceptible to viral infection.
>
> **Caller (Dave):** Is there some kind of food or herb that would consume a virus. Bleaches and cleansers to kill covid, its easy to get rid of it with soap
>
> **Ray Peat:** Sunlight and Ultraviolet light destroys it quickly.
>
> **Caller (Dave):** 'Rants about cannabis'. I smoked the pot, made me cough. The dusty smoke and the funny books, I laughed and coughed. Eventually I coughed up so much stuff.
>
> **Herb Doctor:** 55:40 - A lot of herbs have a lot of expectorant properties and that’s how they work.
>
> **Ray Peat:** Speaking of herbs, emodin, which is the active ingredient in Chinese rhubarb and cascara sagrada, specifically blocks the coronavirus spike protein and the angiotensin converting enzyme. So besides being anti-inflammatory and restorative of mitochondrial respiration and many good things, it does have a specific anti-viral action.
>
> **Herb Doctor:** 56:28- Would it have any purging effects?
>
> **Ray Peat:** The sensitivity varies, but if you’re going to treat something deadly, for example such as advanced kidney failure, the kidneys are so improved by the function of Emodin, that I don’t think anyone worries about a little laxative action.

### Source 8 — Endotoxin, Free Radicals, and Inflammation — KMUD July 2009

Ray Peat · Interview · 2009 · http://www.l-i-g-h-t.com/files/herb-doctors-bowel-endotoxinnew.mp4

> **Andrew Murray:** Cascara sagrada in constipation? (Peter, it didn't sell out for no reason that day; send me comission)
>
> **Ray Peat:** Well, all of these responses to inflammation tend to become progressive and even lead to the death of some of the nerves in the intestine. So, it's better to use any substance such as a plant drug, rather than suffer the consequences of inflammation; and it happens that Cascara has structural analogies to many of our own substances: vitamin K and coenzyme Q, and progesterone have structural similarities to cascara. So, what it's doing is reinforcing our defense systems and it's very unusual among drugs because it basically reinforces all of the good processes and doesn't support any of the inflammatory toxic processes; it's anti-inflammatory, anti-carcinogenic, helps to reduce anxiety for example, increases energy production the way thyroid and progesterone do; everything that our own system does, it reinforces. My newsletter is going to talk about the history of related substances, early in the century, when free radicals were discovered, a doctor in Michigan, W. F. Koch began working out the implications for how to defend our cellular respiratory system from these toxins in the environment, and one of the substances that he worked with was the anthraquinone. He went to Brazil and the famous brazilwood, it's red because of the anthraquinone, but he explored all of the quinones that he could, and found that they work with vitamin E, vitamin K and coenzyme Q, and thyroid to maintain and protect respiration.

### Source 9 — One Radio Network: Ray Peat with Patrick Timpone — February 21, 2022

Ray Peat · Interview · Feb 21, 2022

> And the FDA several years ago took it off the market as a laxative. At that time, the pharmaceutical industry was investigating it, discovering that its main active ingredient, Imodin, was very promising as a cancer treatment. But the FDA used the excuse of calling it a possible carcinogen to take it off the market because they wanted to promote a pharmaceutical they thought better equivalent, except it turned out that the maximum safe, so-called safe use period was only five or six months. And at the end of that time, they said then you have to find some other laxative, but they had taken Cascara off the market, so the real alternative didn't exist. And it turned out that very quickly they took this new laxative, a proprietary chemical, off the market because it was causing deaths of the colon. Death of the colon? Yeah, it reduced the blood supply to the colon by increasing serotonin. The serotonin was causing increased spastic-type stimulation that would force the bowel to move for a while, but then it was creating chronic irritation and deprivation of oxygen to the intestine, so they had to have their colons removed. Oh my goodness, oh my goodness. So I suspect then if one is a good researcher, they could find a Cascara sagrada that is well-aged. You just have to figure it, find it, right? Yeah, and the whole ploy calling it a potential carcinogen really was motivated by the urge to sell something that turned out to be really deadly. Wow, wow. Now something like Cascara sagrada, or some people use, well let's just do that one. Would one be at risk to become totally dependent on that, or would it just be used now and then? Yeah, while using it to prevent all of the constipation symptoms and reduce inflammation, then you can figure out what is wrong with the foods that you're eating that are causing the inflammation and constipation. I see. So use it as a medicine and not something you take every day. Yeah, although people have taken it every day for decades, and the first argument was that there might be something wrong with it, because pranic laxative users had brown pigmented colons. But doing the study properly, it turns out that constipation and irritation caused the pigmented colon, and proper use of the laxatives would be reducing the irritation and formation of the brown pigment.

### Source 10 — KMUD Aging and Energy Reversal 2013

Ray Peat · Interview · 2013 · https://www.youtube.com/watch?v=HYV6mgImPhs

> **Andrew Murray:** You could definitely try that, because it does sound like there is some kind of imprinted memory in what happened through that.
>
> **Caller:** Yeah, I tried to look it up and there were several things I found on the internet, but none of them suggest any type of treatment. And I would have an open sore there, until that heals. It would heal rapidly, but at times it would form a false crust or scab, which would come off.
>
> **Andrew Murray:** You could definitely try that anaesthetic cream as the next thing to do. I think we have two more callers so let’s get the next caller on the air. Where are you from?
>
> **Caller:** About the woman who used alcohol and something else up her shin and the eczema disappeared instantly. What was the other thing?
>
> **Andrew Murray:** Was it lidocaine, Dr Peat?
>
> **Ray Peat:** No, that particular one was just novocaine — procaine. It will dissolve in water, but a little alcohol makes it dissolve faster.
>
> **Andrew Murray:** Very briefly, Dr. Peat, I know that emodin and another laxative from cascara were definitely used to suppress bladder cancer cell growth. I saw an article about that. Do you know much more about emodin?

_Generated 2026-07-20 from the Bioenergetic Oracle corpus._