The Epsom Salt Flush: history, benefits and naturopathic practice
Some topics are only ever spoken of in hushed tones during a consultation — and purging is one of them.
Not because it's dangerous. Because it's taboo.
Deliberately and radically emptying your bowels is still the kind of thing that makes dinner guests blush. And yet: documented since 1618, studied by gastroenterologists, practised on every continent for millennia, and experienced as liberating by generations of people who dared to try it.
So let's talk. Really talk. About chemistry, history, the liver, bile, nausea, rediscovered lightness — and a cow who started it all.
The Epsom Salt Flush: from 1618 to today
In 1618, during an English drought, in the small town of Epsom (Surrey), a cowherd named Henry Wicker led his cattle to a pond.
The cows refused to drink.
Curious, Wicker tasted the water. It was bitter. Applied to the skin, it soothed wounds. Drunk, it purged.
Word spread. Epsom became one of England's first spa towns. People came to drink the bitter water on an empty stomach, from stone tankards, directly at the well. Samuel Pepys recorded his visit in his diary in 1667. King Charles II himself was a regular visitor. A local apothecary spotted the commercial potential — and bought the well to close it off, steering visitors toward his own facilities. Detox capitalism is nothing new...
In 1695, chemist Nehemiah Grew published the first scientific treatise on the "bitter purging salts" and was granted a royal patent for his purification method. The name "Epsom salt" would remain tied to its place of discovery, not production — a delightful footnote: as early as 1715, a German visitor asked a local where to buy the famous salt, and was told not a single ounce had ever been produced there.
Long before the cowherd: a millennia-old, universal practice
Long before Henry Wicker and his cow, the wisdom of cultures around the world had already understood.
In Ayurveda, purgative practices (virechana) are part of the Panchakarma protocol — five fundamental purification therapies for balancing the doshas. Virechana used purgative plants tailored to each person's constitution. Its goal was as spiritual as it was physical: empty the body to free the mind.
In médecine traditionnelle chinoise, purgative preparations based on rhubarb (da huang) have been documented for over 2,000 years in the Shennong Bencao Jing, the first Chinese medical herbal.
Hippocrate himself recommended purgatives — with a nuance rediscovered two millennia later in naturopathy: always in harmony with the seasons, always adapted to the individual.
What history tells us is that the idea of "emptying to begin again" is universal. It crosses cultures, continents, centuries. Epsom salt is simply a modern, well-documented version of it.
Which salt to buy?
For a flush, you need food-grade or pharmaceutical-grade magnesium sulphate, pure, with no additives or fragrance.
Where to find it:
Pharmacies: sold over the counter in sachets — a pharmaceutical product explicitly intended for internal use.
Magasins bio: health food shops — the Anaé brand is often available.
En ligne: Biovie, Aroma-Zone, Greenweez, Onatera, Naturitas...
What to check on the label: high purity (99%+ magnesium sulphate heptahydrate), no fragrance or colouring, no mention of "external use only".
Practical note: Epsom salt tastes bitter. Really, genuinely bitter. The 17th-century visitors to Epsom drank it grimacing — and you probably will too. Ice-cold water, drink it fast. The grimace has been part of the ritual since 1618!
How does it work in the body?
Osmosis — when salt calls for water
Magnesium sulphate is very poorly absorbed by the intestinal wall. Once in the digestive tract, it remains mostly in the intestinal lumen and creates an gradient osmotique: water from the surrounding tissues migrates into the intestine to balance concentrations on either side of the wall.
Volume increases. The walls stretch. Contractions accelerate.
And everything that was stagnant finally moves.
This isn't an assault on the body. It's physics applied to biology. Water doing its work — water, the universal element of purification across all the world's traditions, here mobilised by a mineral.
The hepato-biliary effect — often overlooked
What many people don't know: Epsom salt has a real effect on the vésicule biliaire, independently of any combination with olive oil.
Taken orally, it stimulates the release of cholécystokinine (CCK), a hormone that triggers gallbladder contraction and relaxation of the sphincter d'Oddi — the valve regulating bile flow into the intestine. This mechanism was formalised in the early 20th century as the test de Meltzer-Lyon, long used in hospital medicine to study biliary drainage.
In practical terms: some people with a heavily congested liver experience significant nausea during the flush. This isn't a sign something is wrong — it's a sign that the mobilisation of stagnant bile is real. Good preparation beforehand considerably reduces this discomfort.
The flush without olive oil — and why I prefer it
In the protocol popularised by Andreas Moritz, small green balls sometimes appear in the stools, presented as expelled "gallstones".
These balls are in fact the product of saponification: olive oil, in contact with bile salts and gastric acidity, transforms into small aggregates that look remarkably like gallstones — without being any such thing.
In my practice, I favour the version sans huile for three reasons: real biliary mobilisation happens anyway with the salt alone via CCK; large amounts of olive oil are hard to get down for people with a sluggish gallbladder; and a simple protocol is better followed, with less room for error.
Benefits: on four levels
On the physical level
Complete emptying of the colon, stimulation of the gallbladder, relief of occasional constipation, a transition tool during dietary changes or fasts.
On the emotional level
Many of my clients describe an légèreté émotionnelle in the days following. The gut and emotions are connected — that's not a metaphor. It's the enteric nervous system, the vagus nerve, intestinal serotonin.
On the mental level
Mental clarity after a flush is one of the most common things clients report. The fog lifting, thoughts becoming more organised. A less cluttered gut means a less cluttered mind.
On the energetic and ritual level
In many medicinal and spiritual traditions, deliberately emptying the body is a symbolic act as much as a physical one.
It is saying to the body: I hear you. I am taking care of you. I am giving you the chance to let go of what you no longer need to carry.
The flush as a gesture of reset — like the great tides that clean what the everyday current cannot wash away.
Preparation is everything — and it's different for everyone
This is the most important point — and the most underestimated.
A flush without preparation is like opening a valve without having cleaned the pipes upstream. It might be fine. It might also be hard.
The key stages exist — their content needs to be personalised:
There is always a preparation phase in the days beforehand: lighter eating, herbal teas adapted to your constitution (liver, kidneys, intestines), good hydration. The duration, the plants chosen, the dietary adjustments — all of it depends on your terrain.
There is the day of the flush itself: on an empty stomach, with the salt dissolved in water, keeping your day free. The exact form, the timing, what you combine it with — again, all chosen according to the individual.
And there is the refeeding in the days that follow: gentle, gradual, adapted. This step is just as important as the flush itself.
Why no precise quantities here?
Because a universal dosage doesn't really exist. Someone with a very congested liver will need a longer preparation and a lower dose than someone in good health. Age, constitution, history, medications, any existing conditions — everything plays a role.
This is exactly why a flush is chosen and calibrated in a naturopathy consultation — not on a forum.
What I see in consultation
I have supported many clients through their flush journey — choosing the right flush for their constitution, adapting the preparation, adjusting the refeeding.
Fast eliminations. Some people with high vitality eliminate very quickly after taking the salt. The body is ready, the terrain is favourable. The flush goes quickly and smoothly.
Congested livers. I have also supported people who experienced significant nausea. It can be relieved — cold peppermint tea, ginger, lying on the right side. And good hepatic preparation beforehand considerably reduces this risk.
Positive feedback. Many clients report, in the 2–3 days after the flush, a notable boost in vitality, tangible hepatic relief, and mental clarity. The gut emptied, digestion resuming, body and mind lighter.
My personal experience. For health reasons, I went through a period in which I followed an intensive protocol: 16 flushes in a short space of time, with remarkable effects on my health. I don't recommend that rhythm without genuine necessity. But that experience deeply grounded my practice. Since then, I flush occasionally, purposefully, with varying regularity. For my physical body — but also when I need mental clarity, when I feel foggy, when I can't see things clearly. The effects vary each time, but they are always very positive when the flush is well prepared. It is from this direct experience, and from the feedback of all my clients, that my conviction comes.
An important warning. I have also supported people who had flushed too regularly and exhausted themselves. The flush is an occasional tool — not a weekly ritual. The goal is to help the body rediscover natural, autonomous cleansing through appropriate nutrition, gentle fasting, and regular care.
FAQ — The most common questions
What quantity of Epsom salt for a flush?
There is no universal dosage — which is precisely the problem with protocols people copy-paste online. The quantity depends on your constitution, vitality level, the state of your liver, your history, and your preparation. This is what we assess together in consultation, so your flush is effective and well tolerated.
How often should you do an Epsom salt flush?
The flush is an occasional tool, used within a broader naturopathic approach. Not an automatic weekly ritual. The goal is to support the body at key moments (change of season, detox, dietary transition, fasting) — not to compensate for an insufficient lifestyle.
Epsom salt flush with or without olive oil?
Without, in my practice. The biliary effect of Epsom salt (via cholecystokinin) is real without the oil. And large amounts of olive oil are often poorly tolerated by precisely the people who would need it most. I explain this in detail in the article.
Is the Epsom salt flush dangerous?
It is contraindicated in certain situations (kidney failure, cardiac conditions, pregnancy, intestinal obstruction). It can be uncomfortable if the terrain is very congested and preparation insufficient. Well calibrated and well prepared, it is a safe and effective tool — which means not improvising it alone.
To go further
For personalised support with your detox journey, your flush project, or a constitution assessment:
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