Oryeong-san (오령산) is a time-tested East Asian herbal formula with roots in the Han Dynasty classic 'Shang Han Lun' (Treatise on Cold Damage), written around 200 CE. It combines five botanicals — Alisma, Polyporus, Poria, Atractylodes, and Cinnamon twig — chosen specifically to work together on the body's fluid regulation. It has been continuously used in Chinese, Japanese (Kampo), and Korean traditional medicine for nearly two millennia, making it one of the most studied classical formulas in modern herbal research.

The formula works primarily by supporting healthy kidney and urinary function, helping the body excrete excess fluid without depleting electrolytes the way harsh diuretics can. Alisma and Polyporus contribute the main diuretic-like action, while Poria calms the nervous system and supports digestion. Atractylodes strengthens the digestive system's role in fluid absorption, and the small amount of Cinnamon twig is thought to warm circulation and direct the formula's effects to the right places. Together they address what classical medicine called 'water accumulation' — the modern equivalents being edema, bloating, and urinary irregularity.

The granule form (dissolved in warm water) is the most widely used in modern clinical settings in Japan, Korea, and Taiwan. Traditional decoction — simmering the dried herbs in water — is still practiced but less convenient. Capsule and tablet forms are increasingly available in Western markets, though granules and decoctions are generally considered most clinically effective.

• Edema and water retention
• Urinary difficulty or reduced urine output
• Bloating and abdominal water accumulation
• Nausea and vomiting (fluid-related)
• Headache tied to fluid retention
• Hangover symptoms
• Liver cirrhosis-related fluid buildup (ascites support)
• Nephrotic syndrome (supportive care)
• Motion sickness and fluid-triggered dizziness
• Metabolic syndrome (fluid and lipid components)

• Recurrence of kidney stones (limited evidence — some Kampo clinical data suggest it may reduce oxalate stone recurrence when used long-term)

Oryeong-san is a multi-herb formula and is not found in food. To support the same fluid-balancing and kidney-supporting goals, focus on: (1) Asparagus — a natural mild diuretic that encourages healthy urine output; (2) Celery — contains phthalides that support blood pressure and fluid regulation; (3) Cucumber — high water content, supports hydration and kidney flushing; (4) Watermelon — contains citrulline and high water content, supports kidney function; (5) Barley water — traditionally used across East and South Asian cultures to support urinary health and ease fluid retention. Limit sodium, alcohol, and highly processed foods, which worsen fluid retention and counteract this formula's effects. Foods to limit: High-sodium processed foods (worsen fluid retention), Alcohol (adds fluid burden and liver stress), Excess caffeine (disrupts kidney fluid regulation).

• Mild diarrhea or loose stools (most common, usually dose-related)
• Nausea or stomach upset (rare, often resolves with food)
• Increased urinary frequency (expected and usually temporary)
• Electrolyte imbalance with prolonged high-dose use (rare)
• Allergic skin reaction (very rare)

• Recommended daily: Granule form: 7.5 g/day divided into 2–3 doses (standard Japanese Kampo dose). Traditional decoction: 1 packet of dried herbs boiled and divided across the day. Capsule dosing varies by manufacturer — follow label guidance.
• Best time of day: Traditionally taken before meals, 2–3 times daily. Morning and early afternoon dosing is preferred to avoid nocturia (nighttime urination).
• With or without food: Traditionally taken on an empty stomach or 30 minutes before meals for best absorption, but can be taken with a small amount of food if stomach upset occurs.
• Time to effect: Acute fluid symptoms may respond within 1–3 days. Chronic conditions typically require 2–8 weeks of consistent use.
• How long to take it: For acute conditions (hangover, nausea, mild edema): short-term use of days to 2 weeks is appropriate. For chronic conditions (nephrotic syndrome support, liver ascites, stone prevention): 1–3 months under practitioner supervision. No established maximum duration, but periodic reassessment is advised.