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블로그 2026년 7월 10일

The Saying That Herbal Medicine Only Works If You Take It for a Long Time

Dr. Dr. Heo Ji-young, Director of Kyunghee Meerae Korean Medicine Clinic, Gwangjin
의료 감수 Dr. Heo Ji-young Representative Director · KMD

"Herbal medicine only works if you take it for a long time, right?"

Half true, half false. And this misunderstanding creates two kinds of loss.

The loss of waiting, saying "it's not time yet," for a remedy that should show its effect quickly. And the loss of quitting, saying "this one doesn't work," on a recovery that needs time.

I explain herbal medicine by dividing it into fast remedies and slow remedies.

The remedy that responds that very evening

Let me start with this. Some herbal remedies respond astonishingly fast.

In theory, this is strange. A large share of herbal medicinal compounds aren't absorbed as they are. The microbes living in the gut work on them first to convert them into their active forms, and they change once more as they pass through the liver. It ought to take time.

So why is it fast?

Because before they travel through the bloodstream around the whole body, they do their work first at the spot they touch.

The path leading from the mouth to the stomach and the intestines is itself an enormous surface. This surface is densely packed with nerve endings, has immune cells standing by, and is crowded with devices that sense stimuli.

The moment the remedy touches this surface, without waiting for absorption, the signal begins right there. It stops, right on the spot, cells that had been hypersensitively excited from pouring out their substances. Nerve endings receive the stimulus right there and send a signal to the brain.

Because it doesn't have to go through the whole body, it's fast.

And so these symptoms respond quickly

  • Cramping pain that suddenly clenches
  • The pulling sensation of a bubbling, churning belly
  • The foreign-body sensation as if the throat is blocked
  • Nausea that rises up urgently

These are states in which the body is overreacting. Calming an excessive reaction can be quick. If nothing changes within a few days, I re-examine the prescription.

What inevitably takes time

Conversely, there are cases where even the best remedy cannot skip over time.

Cases where the property of the tissue has changed.

Tissue that has been compressed and swollen for a long time stiffens while holding water. Its density rises and it grows heavy. For this tissue to return to its original property, materials have to come in, the old has to go out, and cells have to be made anew.

This is construction work. It doesn't happen with a single signal.

The same is true when absorption has broken down.

If the gut has long stopped receiving, then immunity calms down → absorption returns → energy is produced → and only then does blood reach the hands and feet. You cannot skip this order.

It's the same when the nerves have become oversensitive.

When pain has lasted a long time, the very circuit that transmits the signal turns into an amplified state. Time is needed for the circuit to return to normal. It's similar to how, for a while after an accident, your heart races every time you pass that road.

And so this is how I put it

What is the goal Roughly when
Calming an excessive reaction It often changes within a few days
Reviving absorption and metabolism It takes a few weeks
Changing the property of stiffened tissue It takes a few months
Returning an oversensitized nerve circuit to normal A few months, sometimes longer

These four can be present together in the same person. When that happens, some symptoms ease early, and some symptoms ease later.

This is also why you feel that "it was getting better and then stayed the same." The fast part improves first, and the slow part is still in progress.

And so, what I say at the first visit

When I prepare a remedy for you, I intend to say this.

"This symptom will change within a week. If it doesn't, I've read it wrong, so please let me know."
"This symptom takes about two months. Don't be alarmed if there's little change at the one-month mark."

If I don't tell you the timetable in advance, two things happen. When a remedy that should respond quickly doesn't work, you wait endlessly, and when it's a recovery that needs time, you give up after just a month.

"Let's wait and see" is not medical care. I should be able to tell you what you're waiting for, why, and until when.

Conversely, the signs where you must not wait

While taking herbal medicine, if the following appear, do not wait — contact me.

  • Hives, itching, swelling of the face or lips
  • Shortness of breath or a feeling of the throat tightening
  • Severe abdominal pain, vomiting, black stools
  • Eyes or skin turning yellow
  • Palpitations, an irregular pulse
  • A marked decrease in urine output

None of these are part of "the process of getting better." Stop the medicine.

To be honest with you

That the compounds in herbal medicine are activated through the metabolism of gut microbes is a well-known fact. That nerves and immune tissue are densely concentrated on the surface of the digestive tract is likewise established.

However, my explanation that "this is why herbal medicine acts quickly right at that spot" still has the character of a hypothesis. There is laboratory-supported evidence, but how strongly this pathway operates in humans has not been confirmed.

What I can say with certainty is that in clinical practice, fast responses and slow responses clearly divide. The explanation for that reason is my interpretation.


I don't like the saying that herbal medicine is a slow remedy.

What is slow is not the medicine, but the recovery. The medicine only hands over a signal; the work that takes time is being done by the body.

So to the question "how long do I have to take it," it would be right to answer this way: "It depends on what you're trying to reverse."

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Dr. Dr. Heo Ji-young, Director of Kyunghee Meerae Korean Medicine Clinic, Gwangjin

Dr. Heo Ji-young Representative Director · KMD

A graduate of the College of Korean Medicine at Kyung Hee University, with master's and doctoral degrees in pathology — the mechanisms of disease — from its graduate school. Later served as a research professor in the university's Herbology department, studying medicinal substances. Studying both disease and medicine from both sides is the foundation of this practice: explaining "why a given medicine works for a given illness" in the language of both pathology and pharmacology. Explains autonomic, chronic, and intractable conditions — and structural problems of the body — in the language of modern science, and proposes treatment matched to the cause. Has taught prescribing and clinical practice to Korean medicine doctors for over ten years, and is a co-author of "Korean Medicine, Explained by Korean Medicine Doctors," selected for the 2018 Sejong Books list (general category).

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