Korean herbs form one of the oldest continuously practiced botanical medicine traditions in East Asia, with a formal pharmacopoeia documented since at least the early 1600s in the landmark medical text Donguibogam. While ginseng gets most of the international attention, the Korean herbal system encompasses dozens of plants used individually and in multi-herb formulas for everything from fatigue and allergies to skin care and metabolic health. Modern research has started to put numbers behind many of these traditional uses, and the results are a genuinely interesting mix of confirmed activity, surprising mechanisms, and real safety concerns worth understanding.
Ginseng and the Korean Market
No discussion of Korean herbs makes sense without starting at ginseng. South Korea is the world’s largest distributor of ginseng products, with a domestic market valued at roughly $1.14 billion out of a global ginseng market estimated at about $2.08 billion. Four countries, South Korea, China, Canada, and the United States, produce over 99% of the world’s fresh ginseng, totaling around 80,000 tons annually.1Journal of Ginseng Research. The world ginseng market and the ginseng (Korea) Korean Red Ginseng, or hong sam, is the steamed-and-dried form that dominates the premium end of this market. The steaming process changes the herb’s chemical profile, converting certain compounds into forms that are more easily absorbed and that appear to have stronger biological activity.
The clinical research on Korean Red Ginseng has expanded substantially. A randomized, double-blind trial found that a standardized red ginseng extract significantly lowered blood lactic acid and creatine phosphokinase levels after physical exertion compared to placebo, along with improved subjective energy ratings.2Journal of Ginseng Research. Safety and antifatigue effect of Korean Red Ginseng capsule: A randomized, double-blind and placebo-controlled clinical trial In people with nonalcoholic fatty liver disease, red ginseng supplementation lowered a key inflammatory marker (TNF-alpha dropped from about 108 to 93 pg/mL, while the placebo group’s stayed flat), raised adiponectin levels, and reduced fatigue scores in overweight participants.3Journal of Ginseng Research. Anti-inflammatory and antifatigue effect of Korean Red Ginseng in patients with nonalcoholic fatty liver disease More recently, a placebo-controlled trial tested red ginseng extract in people experiencing long COVID symptoms. Women in the treatment group showed significantly improved chronic fatigue symptoms at 12 weeks, and the group’s CD4/CD8 immune cell ratio rose meaningfully over the study period. The placebo group, by contrast, experienced a significant drop in regulatory T cells, a type of immune cell that helps prevent overactive immune responses, suggesting the ginseng may have had a protective effect on immune balance.4Journal of Ginseng Research. The effects of G1899 Korean red ginseng extract powder on long COVID for acute COVID19 infection: A randomized, double-blind, placebo-controlled trial
Mountain-Grown Versus Farm-Grown Ginseng
One of the recurring themes in Korean herbal practice is that where and how a plant grows changes what it can do. This is not just folk wisdom. Detailed chemical profiling of mountain-cultivated ginseng versus garden-cultivated ginseng has found meaningful differences. Mountain-cultivated ginseng contains a higher abundance and diversity of ginsenosides, the active compounds responsible for most of ginseng’s effects. Researchers have characterized over 550 distinct ginsenosides across ginseng samples, and quantified more than 200 of them across dozens of batches, finding that mountain-grown roots were consistently richer in these compounds.5PubMed. Enhanced profiling and quantification of ginsenosides from mountain-cultivated ginseng and comparison with garden-cultivated ginseng
The reason appears to be environmental stress. Garden ginseng has higher levels of malonyl ginsenosides, which are the “original” form the plant produces. In mountain-grown ginseng, those malonyl ginsenosides have been naturally transformed through processes like hydrolysis and deglycosylation into what researchers call “minor ginsenosides,” which tend to be more pharmacologically active.6PubMed Central. Identification of mountain-cultivated ginseng and cultivated ginseng using UPLC/oa-TOF MSE with a multivariate statistical sample-profiling strategy This explains the steep price premium for wild or semi-wild mountain ginseng in Korean markets, where a single root can sell for hundreds or even thousands of dollars. It also means that not all ginseng products are equivalent, even within Korea.
Processing and Bioavailability
Korean herbal practice pays close attention to how herbs are prepared, and the science increasingly backs this up. Fermenting red ginseng with the medicinal mushroom Phellinus linteus dramatically increased the content of absorbable ginsenoside metabolites, from roughly 15 mg/g in the unfermented extract to about 34 mg/g in the fermented version. Skin permeation and intestinal permeability tests both showed markedly improved bioavailability for the fermented product.7PubMed Central. The bioavailability of red ginseng extract fermented by Phellinus linteus The logic is that fermentation pre-converts bulky ginsenosides into smaller metabolites that can cross the gut wall more readily, essentially doing in the jar what your digestive system would struggle to do on its own.
Roasting shows a similar effect with omija (Schisandra chinensis), the five-flavor berry used widely in Korean teas and tonics. Roasting omija at 150°C for just 10 minutes raised its schizandrin content from about 29 mg per 100 g of extract to over 106 mg, and the gomisin A content jumped roughly fivefold compared to simple hot-air drying. Volatile compounds, including monoterpenes and sesquiterpenes, also increased significantly.8Elsevier / PubMed Central. Effect of roasting temperature and time on volatile compounds, total polyphenols, total flavonoids, and lignan of omija (Schisandra chinensis Baillon) fruit extract These are not trivial shifts. They mean the traditional Korean method of roasting omija before making tea is not just about flavor; it genuinely concentrates the bioactive compounds.
Beyond Ginseng: Herbs for Inflammation and Allergies
Several Korean herbs have attracted research attention for anti-inflammatory and anti-allergic effects. Perilla (Perilla frutescens), known as deulkkae in Korean cooking, is probably the best example of the culinary-medicinal crossover that defines Korean herbal culture. The leaves and seeds show up in everyday dishes, but a perilla extract enriched in rosmarinic acid has been tested in a human trial for seasonal allergic rhinitis. Compared to placebo, the perilla extract group had significantly higher response rates for itchy nose, watery eyes, itchy eyes, and total symptom scores. Nasal lavage fluid from treated participants showed lower counts of the immune cells that drive allergic inflammation.9PubMed. Extract of Perilla frutescens enriched for rosmarinic acid, a polyphenolic phytochemical, inhibits seasonal allergic rhinoconjunctivitis in humans In an animal model, rosmarinic acid from perilla also prevented eosinophil buildup in the airways and suppressed key allergy-driving signals.10PubMed. Rosmarinic acid in perilla extract inhibits allergic inflammation induced by mite allergen, in a mouse model
Korean mugwort (Artemisia princeps cv. Sajabal, known as ssuk) is another kitchen staple that doubles as medicine. An ethanolic extract of this particular Korean cultivar reduced aortic lesion formation by about 37% and macrophage accumulation by 43% in an animal model of atherosclerosis. It also tamped down expression of adhesion molecules and inflammatory cytokines in blood vessel walls.11PubMed. Antiatherosclerotic effects of Artemisia princeps Pampanini cv. Sajabal in LDL receptor deficient mice These are animal findings, not clinical proof in humans, but they align with the long Korean tradition of using mugwort in soups, rice cakes, and moxibustion as a general anti-inflammatory.
Astragalus and Immune Support
Astragalus (Astragalus membranaceus), called hwanggi in Korean, is one of the most commonly prescribed herbs in Korean traditional medicine, typically used to “tonify qi” in classical terms. In modern research language, its polysaccharides activate macrophages and influence both arms of the immune system by stimulating T and B cell function and promoting the release of a range of immune-signaling molecules.12Journal of Functional Foods. Potential benefits of incorporating Astragalus membranaceus into the diet of people undergoing disease treatment: An overview It also has protective effects on immune organs including the spleen, liver, and bone marrow.
An interesting nuance emerged from a study that gave astragalus water extract to healthy mice. Their peritoneal macrophages showed increased expression of scavenger receptors, meaning they became better at clearing debris and pathogens. But when those same macrophages were challenged with a strong inflammatory stimulus, they actually produced a more restrained response, with reduced expression of molecules that would normally ramp up T cell activation, while still maintaining their ability to produce key inflammatory cytokines.13PubMed Central. Exploring the complex immunomodulatory effects and gut defense via oral administration of Astragali radix water extract to normal mice This is what researchers mean by “immunomodulation” rather than simple “immune boosting”: the herb appears to help calibrate the immune response rather than just cranking it up.
Neuroprotection and Cognitive Health
Korean angelica (Angelica gigas Nakai), or dang-gwi, is one of the most distinctive Korean herbs partly because it differs from the Chinese and Japanese angelica species used in those countries’ traditions. Its root contains pyranocoumarins, primarily decursin and decursinol, that have shown neuroprotective and cognitive-enhancing effects across multiple laboratory and animal studies.14PubMed Central. Neuroprotective and Cognitive Enhancement Potentials of Angelica gigas Nakai Root: A Review Human clinical data remain limited, but the preclinical profile is strong enough that Korean angelica root extracts have become a common ingredient in Korean brain-health supplements.
Solomon’s seal (Polygonatum odoratum), known as dunggulle and widely consumed as a roasted tea in Korea, has a pharmacological profile that spans antioxidant, anti-inflammatory, antiviral, and blood sugar-lowering effects.15PubMed. Botany, chemistry, bio-activity, and application of Polygonatum odoratum (Mill.) Druce: a comprehensive review The glucose-lowering mechanism is particularly interesting: compounds called homoisoflavonoids isolated from Solomon’s seal roots turned out to be potent inhibitors of the glucose transporter GLUT2. In lab tests, these compounds blocked about 40-50% of glucose transport at a standard test concentration, outperforming well-known flavonoids like quercetin and apigenin by a wide margin.16PubMed. Homoisoflavonoids Are Potent Glucose Transporter 2 (GLUT2) Inhibitors: A Potential Mechanism for the Glucose-Lowering Properties of Polygonatum odoratum This suggests Solomon’s seal tea could have a real, if modest, effect on post-meal blood sugar spikes, though controlled human trials are still needed.
Multi-Herb Formulas and the Korean Approach to Compounding
Korean herbal medicine rarely uses single herbs in isolation. The tradition emphasizes multi-herb formulas, or cheobangs, designed so that individual ingredients complement, buffer, or enhance one another. One of the best-known examples is Kyung-ok-ko (also called Gyeongokgo), a traditional paste made from ginseng, rehmannia, poria mushroom, and honey. A narrative review of its research found evidence of antioxidant, anticancer, anti-inflammatory, immune-stimulating, and growth-promoting properties, along with effects on the central nervous, cardiovascular, gastrointestinal, and respiratory systems, without significant toxicity or side effects.17PubMed Central. The efficacy, effectiveness, and safety of Kyung-ok-ko: A narrative review
The constitutional framework that guides many of these formulas is unique to Korean medicine. Called Sasang typology, it classifies people into four body types, each with different herbal affinities. A pharmacognostic analysis found that herbs prescribed for each type cluster around distinct chemical families. Herbs for the So-Yang type, for instance, are enriched in compounds with antipyretic and diuretic effects, while herbs for the So-Eum type tend to feature monoterpenes and sesquiterpenes that aid digestion.18Integrative Medicine Research. Pharmacognostic outlooks on medical herbs of Sasang typology Whether or not you accept the typology itself, the chemical clustering confirms that the traditional herb-to-type assignments were not random. They reflect real phytochemical patterns.
Korean Herbs for Sleep
Sleep disorders in Korea have roughly doubled over the past decade, with prevalence rising from about 7.6% of the population in 2011 to about 14.4% in 2020. Within that growing patient population, roughly 10% were prescribed herbal medicines for their sleep problems, accounting for about 9.6% of total hospital visits related to sleep disorders. The most commonly prescribed herbal formula was Gamisoyo-san, with over 100,000 cases, followed by Hwanglyeonhaedok-tang and Sosiho-tang.19PubMed Central. Elevated prevalence and treatment of sleep disorders from 2011 to 2020: a nationwide population-based retrospective cohort study in Korea These formulas are covered under Korea’s National Health Insurance system, meaning herbal sleep treatments are part of mainstream, insured medical care in Korea, not an alternative fringe practice.
Skincare and Topical Uses
The Korean beauty industry’s embrace of traditional herbal ingredients is not purely marketing. Data mining of the Donguibogam, the foundational Korean medical text compiled in 1613, identified 52 medicinal herbs significantly associated with 26 skin-related keywords. Ginseng was strongly associated with tonification and anti-aging, while rehmannia was linked specifically to anti-aging.20Integrative Medicine Research. Identification of candidate medicinal herbs for skincare via data mining of the classic Donguibogam text on Korean medicine Many of the herbs that turned up in this analysis are the same ones now appearing in premium K-beauty products.
One herb gaining particular research attention for topical use is Houttuynia cordata, known as eoseongcho in Korean. Its essential oil inhibited the growth of several skin-relevant microbes including the bacterium most associated with acne. It also suppressed inflammatory signaling in immune cells at very low concentrations and showed wound-healing and anti-melanogenic properties in vitro.21PubMed Central. In vitro bioactivities and formulation stability of Houttuynia cordata essential oil for cosmetic applications The researchers noted that while the results are promising for acne-focused skincare formulations, in vivo confirmation is still needed.
Korean tangerine peel (Citrus unshiu), especially from Jeju Island, rounds out the topical and internal-use overlap. In an animal model, peel extracts improved lipid metabolism, showed a protective effect against fatty liver changes, and improved bone-related markers, all without raising estrogen levels or liver enzymes.22PubMed Central. Preventive effects of Citrus unshiu peel extracts on bone and lipid metabolism in OVX rats Dried tangerine peel is a common ingredient in Korean herbal formulas and teas, and it appears in numerous skincare products targeting brightening and antioxidant protection.
Safety, Drug Interactions, and Quality Control
Korean herbs are pharmacologically active, which means they can also cause problems, especially when combined with prescription drugs. Several herbs commonly used in Korean medicine have been shown to inhibit cytochrome P450 enzymes, the liver enzymes responsible for metabolizing most medications. In one in vitro study of 15 herbal medicines used in Korea, Epimedii herba was the most potent inhibitor, affecting six different CYP enzymes. The researchers noted that because usual doses of these herbs involve several grams of freeze-dried extract, clinically significant interactions are plausible even though plasma concentrations of the active compounds were not measured.23PubMed. Inhibition of human cytochrome P450 isoforms and NADPH-CYP reductase in vitro by 15 herbal medicines, including Epimedii herba
Korean Red Ginseng itself has been shown to alter drug transporter expression in the liver and kidneys. In an animal study, ginseng extract significantly increased expression of several drug transporters and decreased the systemic exposure of fexofenadine (a common antihistamine) in a dose-dependent manner.24Journal of Ginseng Research. Effect of Korean Red Ginseng extracts on drug-drug interactions Ssang-hwa-tang, one of Korea’s most popular herbal tonics sold widely as a bottled drink, inhibits CYP1A2 through a mixed reversible mechanism and upregulates CYP2E1, which raises the concern that it could increase the toxicity of certain environmental chemicals through enhanced metabolic activation.25PubMed. In vitro and in vivo assessment of cytochrome P450-mediated herb-drug interaction of Ssang-hwa-tang If you take prescription medications and regularly consume Korean herbal products, disclosing this to your doctor or pharmacist is genuinely important.
On the contamination front, Korea strengthened its regulations on heavy metals in herbal products in 2006, setting limits for lead, arsenic, cadmium, and mercury. However, the regulatory landscape has gaps. Herbal plants and products listed with the Korean FDA are regulated, but formulas individually prescribed by Korean herbal doctors are not subject to the same oversight. Additionally, the same concentration limits apply to raw herbal plants and finished products, even though processing can concentrate or reduce contaminant levels. There are also no standards for evaluating metals as potential allergens in herbal products.26PubMed Central. Quantitative Analysis of Metal Contents in Korean Herbs and Herbal Products to Give Advice for Metal Allergic Patient If you are buying Korean herbal products from overseas, looking for brands that voluntarily test and disclose heavy metal and pesticide results offers some additional assurance.
The Donguibogam and Why Historical Context Matters Here
Korean herbal medicine is often lumped in with Chinese traditional medicine, but the two diverged centuries ago. The Donguibogam, compiled by the royal physician Heo Jun and published in 1613, is the text that codified a distinctly Korean approach. It organized herbs around Korean geography, climate, and constitutional types rather than simply adopting the Chinese materia medica wholesale. Modern text-mining studies of the Donguibogam have found that its herb-to-condition assignments predict phytochemical relationships that only became measurable with 21st-century analytical chemistry.27Integrative Medicine Research. Identification of candidate medicinal herbs for skincare via data mining of the classic Donguibogam text on Korean medicine A separate systematic search of the text identified multiple cognitive-enhancing herbal formulas that are now subjects of modern pharmacological research.28PubMed. Cognitive-Enhancing Herbal Formulae in Korean Medicine: Identification of Candidates by Text Mining and Literature Review
This matters for practical reasons. The Korean herbal tradition is not a static folk practice. It is a documented, internally consistent system that generates testable hypotheses. When researchers find that a 400-year-old formula produces measurable anti-inflammatory or neuroprotective effects, that is not luck. It reflects a systematic empirical process that accumulated data over centuries, even if the language it used to describe its observations sounds foreign to modern ears. The research pipeline in Korean herbal medicine today increasingly works by mining these classical texts for leads, then subjecting them to modern assays and clinical trials, a strategy that has proven surprisingly productive.