Is Ashitaba a Diuretic? Exploring the Science Behind the Traditional Japanese Herb

January 3, 2026 •

4 min read

Ashitaba, a traditional Japanese herb from the Angelica family, has been used for centuries for its purported health benefits. Its name, meaning "Tomorrow's Leaf," comes from its ability to quickly regenerate leaves when harvested. Among its many traditional uses, Ashitaba is considered to have mild diuretic properties, which is supported by some modern research.

Quick Summary

This article explores the scientific basis behind Ashitaba's traditional use as a diuretic, examining its active compounds and potential impact on fluid balance and blood pressure. It also discusses its other health benefits, potential risks, and comparison to other natural diuretics.

Key Points

Chalcone Content: Ashitaba contains chalcones, which are bioactive compounds linked to its diuretic function and ability to lower high blood pressure.
Traditional Use: Historically, Ashitaba has been used as a folk remedy with mild diuretic effects in traditional Japanese medicine, particularly in the Izu islands.
Blood Pressure Regulation: The herb's potassium content and chalcones help regulate blood pressure by promoting urination and supporting heart health.
Mild vs. Pharmaceutical: Ashitaba's diuretic effect is considered mild compared to prescription medications and is best viewed as a supportive wellness supplement.
Safety Precautions: Individuals on medications, especially those for blood thinning or diabetes, and pregnant women should consult a healthcare provider before use due to potential interactions and lack of safety data.
Holistic Benefits: Beyond diuresis, Ashitaba is valued for its antioxidant, anti-inflammatory, and digestive health benefits.

Understanding Ashitaba and Its Diuretic Potential

Ashitaba (Angelica keiskei) is a popular botanical medicine and food source in Japan, revered for its robust nutritional profile and therapeutic properties. The core of its potential diuretic effect lies in its unique chemical makeup, which includes a high concentration of prenylated chalcones, such as xanthoangelol and 4-hydroxyderricin. These chalcones are a primary focus of scientific inquiry regarding Ashitaba's health effects.

The Role of Chalcones in Diuretic Activity

Chalcones are a class of natural phenols known for their potent antioxidant and anti-inflammatory properties. In the context of diuresis, studies suggest that Ashitaba's chalcones may help lower high blood pressure by promoting the excretion of excess water and sodium from the body. While the exact mechanism in humans requires more extensive research, this effect aligns with Ashitaba's traditional use for managing hypertension. The herb's natural potassium content also plays a crucial role, helping to regulate blood pressure and supporting heart muscle contraction.

Traditional Use and Supporting Evidence

Historically, Ashitaba has been used as a folk remedy for a variety of conditions, including those related to fluid retention. In traditional practices on the Izu islands of Japan, where the plant is native, it was consumed as a tonic with diuretic and mild cathartic effects. This long-standing traditional use provides anecdotal support for its diuretic properties, even though more rigorous human clinical trials are still needed to confirm its efficacy and safety profile for this specific purpose.

Beyond Diuresis: Other Health Benefits

Ashitaba offers a wide range of benefits that contribute to overall wellness, extending far beyond its potential diuretic effects. These include:

Cardiovascular Health: Chalcones and coumarins in Ashitaba support heart health by improving blood circulation, reducing inflammation, and potentially lowering blood pressure.
Digestive Health: Rich in dietary fiber, Ashitaba aids digestion, promotes regular bowel movements, and supports a healthy gut microbiome.
Antioxidant Power: The high concentration of chalcones provides strong antioxidant protection, which helps combat oxidative stress and may contribute to anti-aging effects.
Anti-inflammatory Effects: Ashitaba compounds help to reduce inflammation throughout the body, potentially benefiting conditions like arthritis and inflammatory bowel disease.
Blood Sugar Regulation: Studies suggest that Ashitaba may improve insulin sensitivity and regulate blood sugar levels, making it beneficial for individuals with or at risk of diabetes.

Comparing Ashitaba to Other Diuretics

To better understand Ashitaba's place among diuretics, it's helpful to compare it to both conventional pharmaceuticals and other herbal alternatives.


Feature	Ashitaba (Herbal)	Dandelion (Herbal)	Pharmaceutical Diuretics (e.g., Furosemide)
Potency	Mild. Often used for general wellness and mild fluid retention.	Mild to moderate. Known for its effective, yet gentle, diuretic action.	High. Prescribed for specific medical conditions like severe hypertension or heart failure.
Mechanism	Contains chalcones and potassium, thought to help regulate fluid balance and lower blood pressure.	Contains taraxasterols and high potassium, which promote increased urine output.	Work by various mechanisms to inhibit sodium and water reabsorption in the kidneys.
Electrolytes	Contains potassium, which helps balance electrolyte levels.	Exceptional source of potassium, helping to replenish what is lost during diuresis.	Can lead to significant potassium loss, often requiring supplementation.
Safety	Generally considered safe for short-term use, but can interact with some medications. Avoid during pregnancy.	Generally safe, but consult a doctor if pregnant or on other medications.	Can have significant side effects and require strict medical supervision.
Primary Use	Holistic wellness, mild edema, and supporting blood pressure regulation.	Supporting kidney and liver health, and reducing mild water retention.	Treatment of severe medical conditions where fluid removal is critical.

How to Incorporate Ashitaba Safely

While Ashitaba is generally regarded as safe for most people in moderation, it is crucial to exercise caution and consult with a healthcare provider, especially if you have pre-existing medical conditions or are taking other medications. It can be consumed in several forms:

Fresh Leaves and Stems: These can be added to salads, smoothies, or stir-fries. The yellow sap is an indicator of freshness and potency.
Ashitaba Tea: The dried leaves can be steeped to make a warm, healthful tea.
Powder and Capsules: Supplements are widely available and provide a convenient way to consume the herb, though dosages vary.

Potential Side Effects and Interactions

Some individuals may experience mild gastrointestinal discomfort. Ashitaba's compounds may also interact with certain medications metabolized by the liver, including blood thinners and some drugs for diabetes and high blood pressure. Pregnant and breastfeeding women are generally advised to avoid its use due to insufficient safety data. As with any new supplement, start with a low dose and monitor your body's response.

Conclusion: The Final Verdict on Ashitaba's Diuretic Nature

Is Ashitaba a diuretic? The evidence suggests that, yes, it possesses mild diuretic properties, supported by centuries of traditional use and preliminary scientific findings pointing to its active chalcone compounds. It is not a powerful, fast-acting diuretic like a pharmaceutical, but rather a gentle herbal remedy that supports fluid balance and offers a host of other health benefits, particularly for cardiovascular and digestive health. It is important to approach Ashitaba as a wellness supplement and not a replacement for prescribed medical treatment. For those interested in exploring its benefits, incorporating it into a balanced diet or using it as a tea offers a natural and holistic way to support overall health.

For more in-depth information on the bioactive compounds in Ashitaba and their effects, consult a comprehensive review of the medicinal uses of this unique herb.

Frequently Asked Questions

Ashitaba contains naturally occurring compounds called chalcones and a good source of potassium, which collectively help regulate fluid balance. The chalcones may assist in promoting urination, while potassium helps maintain proper electrolyte balance, which is vital for kidney function and blood pressure regulation.

Ashitaba has been traditionally used to help manage blood pressure due to its potential antihypertensive effects. However, it is not a replacement for prescribed medication and individuals with hypertension should consult their doctor before using it as a supplement.

For mild fluid retention and bloating, Ashitaba may offer some relief due to its mild diuretic properties. Its rich fiber content also aids in digestive health, which can help reduce bloating caused by constipation. For significant water retention, always seek medical advice.

Ashitaba is generally considered safe for short-term oral consumption. However, some people may experience mild gastrointestinal discomfort. Due to potential interactions with medications and a lack of safety data for long-term use, consulting a healthcare professional is recommended.

Ashitaba can be consumed in various forms, including as a fresh leaf in salads or smoothies, steeped as a tea from dried leaves, or taken as a dietary supplement in powder or capsule form. Dosage depends on the format and individual health needs.

Ashitaba is traditionally used to support detoxification and kidney function. While some studies on rats showed no pathological impact on the kidneys with excessive intake, research on human kidney effects is limited. The best approach is to consult with a doctor, especially if you have kidney issues.

Ashitaba may interact with certain medications, including blood thinners, drugs for diabetes, and those metabolized by the liver. It is crucial to speak with a healthcare provider before combining Ashitaba with any prescription medications to avoid adverse effects.