Alkaline Ionized Water & Dongui Bogam

Alkaline ionized water is one of the most discussed topics in functional health today — but what if the science behind it was already understood 400 years ago?

The Dongui Bogam (東醫寶鑑), Korea’s greatest medical encyclopedia, dedicated an entire chapter to the therapeutic properties of different types of water. Long before electrolysis, pH meters, or oxidation-reduction potential (ORP) were concepts, royal physician Heo Jun had already identified that water’s origin, movement, and character directly determine its impact on human health.

In this post, we explore what Dongui Bogam’s Tangaekpyeon (湯液篇) teaches us about water and health — and why its principles align so powerfully with the modern science of alkaline ionized water.

Why Dongui Bogam Still Matters in the 21st Century

Published in 1613 during Korea’s Joseon dynasty, Dongui Bogam — which translates as “Precious Mirror of Eastern Medicine” — was the life’s work of royal physician Heo Jun. Spanning 25 volumes, it synthesized over 2,000 years of Chinese and Korean medical knowledge into a single, systematic framework that was uniquely Korean in its approach.

What made Dongui Bogam revolutionary was its organizing principle. While other medical encyclopedias of the era were organized around disease, Heo Jun organized his work around the human body and, more fundamentally, around the prevention of disease. This was a radical concept for its time — and one that UNESCO formally recognized in July 2009, when it inscribed Dongui Bogam on its Memory of the World International Register.

The UNESCO Recognition and Its Global Significance

UNESCO’s citation was specific and important. It praised Dongui Bogam for developing “the ideals of preventive medicine and public health care by the state, which was virtually an unprecedented idea up to the 19th century.” Korea subsequently designated the book National Treasure No. 319-1 in 2015.

Beyond the honors, the book’s ongoing clinical relevance is what truly sets it apart. Dongui Bogam has been reprinted more than 30 times in China, twice in Japan, and translated into English in 2013. Today it remains an active reference text in Korean traditional medicine (KTM) institutions — not as a historical curiosity, but as a clinical guide.

The key to its durability is its empirical spirit. Heo Jun was a practicing physician, not a theorist. His observations about the body’s relationship with its environment — what it eats, how it moves, what it drinks — carry a precision that continues to resonate with modern integrative medicine.

Dongui Bogam as Preventive Medicine

The book’s core philosophy centers on Yangsaeng (養生) — the cultivation of life through harmony with nature. This means matching one’s diet, sleep, activity, and fluid intake to the rhythms of nature and the seasons.

In Heo Jun’s framework, disease is rarely sudden. It is the cumulative result of small daily choices — including the choice of what water to drink. This makes Dongui Bogam’s water chapter not a footnote, but a foundation.

Tangaekpyeon: Why Water Comes Before Every Herb

The Tangaekpyeon (湯液篇) is the pharmacological volume of Dongui Bogam — its materia medica, listing medicinal properties for hundreds of natural substances. These substances are organized into 16 categories: water, soil, grains, humans, birds, animals, fish, insects, fruits, vegetables, herbs, wood, jade, stone, and metals.

Water is listed first. Not herbs, not grains — water.

This ordering was deliberate. Heo Jun placed water at the head of all medicinal substances because, in his view, all life originates from and depends upon water. The quality of the water a person consumes daily is therefore the most foundational health variable of all.

The Subu (水部): Korea’s First Water Medicine Manual

The water section of the Tangaekpyeon is called the Subu (水部), or “Water Chapter.” It opens with a statement that carries the weight of a medical principle: a person’s health and longevity depend upon the water they drink.

The Subu then classifies 33 distinct types of water, each described with its:

Origin and source environment
Physical character (light, heavy, turbid, clear)
Taste and temperature properties
Therapeutic applications in traditional Korean medicine
Conditions it treats or supports
How and when it should be collected or prepared

This is not folk medicine. This is a systematic, empirically grounded classification of water as medicine — developed four centuries before modern water chemistry existed.

The 33 Medicinal Waters — Key Types Explained

Among the 33 water types in the Subu chapter, eight stand out for their direct relevance to modern functional water science and the science of alkaline ionized water.

① 井華水 (Jeong Hwa Su) — Dawn Well Water

What it is: The very first water drawn from a well at the break of dawn, before sunrise.

Properties: Neutral in nature, sweet in taste, non-toxic. Considered to carry heaven’s concentrated qi (精氣) because it is collected at the moment when yin and yang energy shift.

Therapeutic use: Enhances yin energy (補陰), clears facial discoloration, brightens the eyes, and is considered ideal for compounding medicinal pills and tonics. Heo Jun notes it has the same character as melted snow water.

② 寒泉水 (Han Cheon Su) — Cold Spring Water

What it is: Cold water rising naturally from deep underground spring sources.

Properties: Cool in temperature, mineral-rich from passage through rock, clear and light in character.

Therapeutic use: Clears internal heat (清熱), calms the mind, supports digestion, and benefits the stomach and spleen. This is Heo Jun’s closest analog to what we now call mineral water — and its properties align closely with the mineral profile of alkaline ionized water.

③ 流水 (Ryu Su) — Flowing Stream Water

What it is: Water from swift-flowing rivers or mountain streams.

Properties: Highly energized by movement; carries what Heo Jun describes as dynamic qi from its constant motion.

Therapeutic use: Invigorates the circulation of qi and blood, resolves phlegm stagnation, and benefits the lower body. Movement, in Heo Jun’s framework, is medicinal in itself.

④ 甘瀾水 (Gam Ran Su) — Churned Water

What it is: Water that has been repeatedly scooped and poured until it forms thousands of small bubbles — a process of manual aeration and agitation.

Properties: Considered exceptionally “light” and penetrating compared to still water of the same source.

Therapeutic use: Used specifically in formulas targeting the heart and kidney meridians. This is a fascinating precedent for the modern understanding of micro-clustered water and dissolved gas content.

⑤ 雪水 (Seol Su) — Melted Snow Water

What it is: Water obtained by melting fresh, clean snow.

Therapeutic use: Clears seasonal heat and detoxifies, especially effective against fever-related conditions and skin eruptions. Heo Jun considers its quality equivalent to Jeong Hwa Su (dawn well water).

⑥ 露水 (No Su) — Morning Dew

What it is: Dew collected from plants in early autumn.

Therapeutic use: Considered the purest and most “heavenly” water. Used for longevity formulas, to tonify the lung, and to brighten the skin and eyes. Its collection method — from plant surfaces at dawn — emphasizes origin and purity above all.

⑦ 止水 (Ji Su) — Stagnant Water (Avoid)

What it is: Still, unmoving water with no flow or circulation.

Properties: Heavy, turbid, prone to decay.

Heo Jun’s warning: Stagnant water harms the spleen and stomach, generates internal dampness, and is a source of disease. This aligns precisely with modern understanding: stagnant water harbors microbes, loses dissolved oxygen, and develops a positive (oxidizing) ORP.

⑧ 陰陽湯 (Eum Yang Tang) — Yin-Yang Blended Water

What it is: A mixture of boiling water and cold spring water, combined to create a balanced temperature.

Therapeutic use: Settles the stomach, relieves nausea, and harmonizes the body’s thermal balance. The concept of blending energetically opposite waters to achieve balance prefigures the modern concept of pH and ORP optimization.

The Philosophy Behind Heo Jun’s Water Science

Reading the Subu chapter carefully, four consistent principles emerge that Heo Jun applied across all 33 water categories:

Purity of origin — water from deep underground, from clouds, or from clean mountains is superior to surface water or water near human habitation.
Lightness — water that the body absorbs easily, described as “light” (輕), is healthier than water that is “heavy” (重) or turbid.
Movement and freshness — flowing or freshly drawn water is always preferred over standing or stagnant water.
Mineral character — water that has passed through mineral-rich rock carries the “earth’s qi” (地氣) into the body and is therapeutically superior.

These four principles are not metaphysical. They are astute empirical observations about water quality that map, in remarkable ways, onto modern water chemistry: dissolved mineral content, molecular cluster size, dissolved gas content, oxidation-reduction potential (ORP), and microbial purity.

Heo Jun did not have pH meters or gas chromatographs. But he had four centuries of accumulated clinical observation — and his conclusions were sound.

Alkaline Ionized Water: The Modern Bridge to Ancient Wisdom

This is where the story becomes truly compelling. When we place Dongui Bogam’s water principles alongside the science of alkaline ionized water — also known as electrolyzed reduced water (ERW) — the correspondences are precise and deeply meaningful.

An alkaline water ionizer produces water through electrolysis: filtered water passes over electrically charged platinum-coated titanium plates. The cathode (negative electrode) concentrates alkaline minerals — calcium, magnesium, potassium — and generates dissolved molecular hydrogen (H₂) gas. The result is water with three key properties that Heo Jun would have immediately recognized as superior:

Micro-Clustering: Heo Jun’s “Light Water” in Modern Form

Heo Jun consistently valued water described as “light” (輕水) — water that the body absorbs and utilizes efficiently. His Gam Ran Su (churned water) was valued precisely because aeration made it lighter and more penetrating.

Electrolysis restructures water molecular clusters into smaller, more bioavailable arrangements. Research on electrolyzed reduced water suggests enhanced cellular hydration efficiency — the same property Heo Jun was identifying through clinical observation when he described water as “light.”

Molecular Hydrogen: The Science Behind Clearing Internal Heat

Han Cheon Su (cold spring water) was praised in Dongui Bogam for its ability to “clear heat” (清熱) from the body — to calm inflammation and reduce the body’s internal “fire.”

Modern science provides a precise mechanism: dissolved molecular hydrogen (H₂) in alkaline ionized water is a selective antioxidant. It neutralizes hydroxyl radicals (·OH) — the most reactive and destructive form of free radical — without disrupting beneficial reactive oxygen species (ROS) needed for cellular signaling and immune function. Multiple peer-reviewed studies published in Scientific Reports and Medical Gas Research confirm hydrogen water‘s anti-inflammatory effects across multiple metabolic conditions.

Bioavailable Minerals: Tonifying Yin in Modern Terms

Jeong Hwa Su (dawn well water) and Han Cheon Su (cold spring) were both praised in part for carrying minerals from the earth into the body — supporting what TCM calls yin nourishment (補陰).

Alkaline ionized water concentrates calcium, magnesium, and potassium ions on the cathode side. These bioavailable minerals contribute to bone density, nerve transmission, cardiovascular function, and cellular pH buffering — the precise physiological processes underlying TCM’s concept of yin nourishment.

Negative ORP: Why Heo Jun Rejected Stagnant Water

Heo Jun’s strongest warning in the Subu chapter is against Ji Su (止水) — stagnant water. His clinical observation was that standing water generates disease, harms the spleen, and creates internal dampness.

Modern water chemistry explains why: stagnant water develops a positive ORP (oxidation-reduction potential) — meaning it is oxidizing in character. Ordinary tap water and bottled water typically measure +200 to +600 mV ORP. Fresh spring water and properly produced alkaline ionized water carry a negative ORP (−200 to −800 mV) — meaning they have antioxidant character. The body does not need to spend its own antioxidant resources to process them.

Heo Jun preferred moving, freshly drawn water over stagnant water. He was, without knowing the vocabulary, preferring low or negative ORP water over high positive ORP water.

What Modern Science Says About Alkaline Ionized Water

The scientific literature on hydrogen-rich alkaline ionized water has grown substantially over the past two decades. Japan leads in clinical research — alkaline ionized water has been used in Japanese hospitals since the 1960s, and the Japanese Ministry of Health, Labour and Welfare classifies water ionizers as approved medical devices for improving gastrointestinal symptoms. The Korean Ministry of Food and Drug Safety has similarly approved alkaline ionizers as functional medical devices.

Key Peer-Reviewed Findings

Peer-reviewed research has documented a range of potential benefits from regular consumption of hydrogen-rich alkaline ionized water:

Oxidative stress reduction: Studies show significant decreases in biomarkers of oxidative stress in patients with metabolic syndrome after hydrogen-rich water supplementation.
Athletic recovery: Research documents reduced lactic acid accumulation and faster recovery from exercise-induced fatigue in athletes consuming alkaline ionized water compared to plain water.
Metabolic support: A clinical study published in China involving participants with hypertension, diabetes, and hyperlipidemia found that alkaline ionized water supplementation produced significant decreases in blood pressure, blood glucose, and cholesterol levels.
Gastrointestinal health: Studies confirm improvement in symptoms of acid reflux and gastrointestinal distress, consistent with the Japanese Ministry of Health approval indication.
Hydration efficiency: Research on nuclear magnetic resonance (NMR) spectroscopy suggests that the smaller molecular cluster size of ionized water correlates with improved cellular hydration.

Important Caveats: What the Science Does and Does Not Show

Intellectual honesty matters here. Not all studies show strong results, and the field has real methodological challenges — particularly around standardizing dissolved hydrogen concentration across different study protocols.

The scientific consensus is this: hydrogen-rich alkaline ionized water shows genuine promise, particularly for antioxidant effects and metabolic health. Extravagant claims about curing disease should be viewed critically. But the foundational science — especially around dissolved molecular hydrogen as a selective antioxidant — is solid and growing.

Consumers should evaluate products based on measurable parameters: dissolved H₂ concentration (in parts per million, ppm), ORP value (in mV), and pH level — not on marketing language alone.

7 Principles for Choosing the Right Water Every Day

Drawing on both Dongui Bogam’s Subu chapter and modern functional water science, here are seven evidence-informed principles for making better daily water choices — principles that Heo Jun would recognize, and that research supports.

Prioritize mineral-rich water. Water that has passed through mineral-bearing rock — natural spring water or alkaline ionized water with elevated calcium and magnesium — carries bioavailable minerals your body needs daily.
Avoid long-standing bottled water. Water sitting in plastic bottles develops a positive ORP over time. Fresh water — from a natural source or a home ionizer — retains lower, more favorable ORP values. This was Heo Jun’s Ji Su warning in modern form.
Drink freshly prepared water. The antioxidant hydrogen in alkaline ionized water is volatile — it dissipates within hours. For maximum benefit, alkaline ionized water should be consumed fresh from the device, ideally within 30 minutes of production.
Match water to purpose. Heo Jun’s 33 water types weren’t arbitrary — different waters suited different therapeutic needs. In modern terms: hydrogen-rich alkaline ionized water for daily hydration and antioxidant support; high-pH water (pH 11+) for washing fruits and vegetables to remove pesticide residue; mildly acidic ionized water for skin.
Consider pH as part of a balanced diet. The modern Western diet is heavily acid-producing. Alkaline ionized water (pH 8.5–9.5) supports the body’s natural pH buffering systems, particularly as we age and kidney function decreases.
Choose quality ionization over pH alone. Not all “alkaline water” is equal. Naturally alkaline spring water and properly ionized alkaline water both carry genuine mineral and pH benefits. Chemically alkalized water (sodium bicarbonate added to plain water) does not carry the dissolved hydrogen benefit.
Drink water consistently throughout the day. Dongui Bogam’s Yangsaeng philosophy emphasizes consistency over intensity. Daily, steady hydration with quality water builds the foundation of health. A single glass of hydrogen water per day is a beginning; consistent daily intake over months is where measurable benefits emerge in the research literature.

Conclusion: Two Languages, One Truth

Four hundred years separate Heo Jun’s Subu chapter from today’s alkaline ionized water science. The vocabularies could not be more different — qi and meridians versus ORP and hydroxyl radicals. Yet when you examine the principles carefully, they are pointing at the same empirical reality.

Alkaline ionized water, produced through modern electrolysis technology, embodies the water qualities that Dongui Bogam identified as therapeutically superior: light and bioavailable, mineral-rich, freshly drawn, moving in origin, and antioxidant in character.

Heo Jun placed water first in his pharmacopoeia not because it was simple, but because it was foundational. The water you drink every day is not a passive delivery vehicle for hydration. It is, in the language of the world’s greatest Korean medical text, medicine itself.

Choosing it wisely — guided by both ancient wisdom and modern science — may be the most accessible and consistent health investment available to anyone.

References: Heo Jun, Dongui Bogam (1613), Tangaekpyeon — Subu (水部); PMC/NIH: “Historical Medical Value of Donguibogam” (2016); UNESCO Memory of the World Register Nomination Form (2009); Medical Gas Research — molecular hydrogen water studies; GoodRx: “Is Alkaline Water Good for You?” (reviewed Oct. 2025); ScienceDirect: “A Concise Review on Health Benefits of Alkaline Reduced Water” (2025); Japanese Ministry of Health, Labour and Welfare — water ionizer device classification.