Danshen is a traditional Chinese medicinal herb derived from the dried root of Salvia miltiorrhiza, a deciduous perennial plant in the mint family. It has been used for centuries across East Asia, primarily to treat cardiovascular and circulatory problems. Today it remains one of the most widely studied herbs in Chinese medicine, with active research into its effects on the heart, blood vessels, liver, and kidneys.
The Plant and Its History
Salvia miltiorrhiza is native to China and other parts of East Asia. The plant produces distinctive red-brown roots, which are harvested, dried, and used in medicinal preparations. In Korean traditional medicine, where it’s called “dansam,” the herb was documented in the 17th-century text Donguibogam as effective for removing blood stasis and enriching the blood. That core idea, improving circulation and resolving stagnant blood flow, has remained central to how danshen is used in clinical practice across China, Korea, and Japan.
Active Compounds in Danshen
Danshen’s medicinal effects come from two main groups of compounds. The first group is water-soluble: salvianolic acids A and B, which dissolve easily and are absorbed through the digestive tract. The second group is fat-soluble: tanshinone I, tanshinone IIA, and cryptotanshinone, which are extracted with oils or alcohol-based solvents. These two classes of compounds work through different pathways, which is why danshen preparations often vary depending on which compounds they’re designed to deliver.
The salvianolic acids act primarily as antioxidants and anti-inflammatory agents. The tanshinones have their own anti-inflammatory effects but also influence how blood cells behave, particularly platelets, the small cell fragments responsible for clotting.
How Danshen Affects the Heart and Blood Vessels
The most established use of danshen is for cardiovascular conditions, especially angina (chest pain from reduced blood flow to the heart). It works through several overlapping mechanisms. Its compounds help relax the smooth muscle lining blood vessels, which widens those vessels and allows more blood to flow through. This process involves boosting the body’s production of nitric oxide, a signaling molecule that tells blood vessels to dilate.
Danshen also inhibits platelet aggregation, meaning it reduces the tendency of platelets to clump together. When platelets clump excessively, they can form blockages that restrict blood flow to the heart. By keeping platelets from sticking, danshen helps maintain open blood flow through coronary arteries. Its antioxidant properties add another layer of protection by reducing damage to the cells lining blood vessels, which is one of the early steps in developing heart disease.
The most well-known cardiovascular product is Compound Danshen Dripping Pills, a formulation that combines danshen with two other traditional ingredients. This product became the first traditional Chinese medicine compound to complete a Phase II clinical trial under the U.S. Food and Drug Administration’s investigational new drug process. That trial enrolled 125 patients with moderate chronic stable angina across 15 medical centers in the United States. While this represented a significant milestone for traditional Chinese medicine in Western regulatory systems, the product is not yet FDA-approved as a drug.
Effects on the Liver and Kidneys
Beyond the cardiovascular system, danshen has shown protective effects on the liver and kidneys in laboratory and animal studies. Research has found that danshen injections can protect against liver injury and hepatic fibrosis (scarring of the liver). In kidneys, animal studies demonstrated that danshen reduced damage caused by lead exposure by lowering lead accumulation in kidney tissue, decreasing markers of kidney dysfunction, and reducing oxidative stress. It also suppressed a type of cell death called apoptosis in kidney tissue.
These organ-protective effects appear to stem from danshen’s antioxidant activity. The herb boosts the activity of the body’s own protective enzymes while reducing harmful byproducts of oxidative stress. However, most of this evidence comes from animal models, and the results haven’t been confirmed in large human trials for liver or kidney disease specifically.
Forms and Typical Dosage
Danshen is available in several forms: dried root slices for brewing into tea or decoctions, concentrated extract capsules, tinctures, and injectable preparations used in Chinese hospitals. In clinical Chinese medicine practice, a typical daily dosage of the dried herb is around 3 grams per day. Standardized extract products vary in concentration, so the dose depends on how the product is formulated. Compound preparations like dripping pills combine danshen with other herbs at specific ratios that differ from using danshen root alone.
Side Effects and Safety Concerns
Danshen is generally well tolerated at standard doses. In a Phase I clinical trial of one of its key compounds (salvianolic acid B) in healthy volunteers, no serious adverse events occurred and no participants dropped out. The most common side effects were mild: dizziness in about 4% of participants and occasional chest discomfort. Some participants showed temporary increases in liver enzymes, triglycerides, and markers related to kidney and heart function, but these returned to normal within days.
The liver enzyme elevations are worth noting. Because danshen’s compounds are processed in the liver, there is potential for mild, transient liver stress, particularly at higher doses. Kidney effects appear similarly slight and short-lived based on available data. These findings suggest that while danshen is safe for most people at normal doses, anyone with existing liver issues should be cautious.
Interactions With Blood Thinners
The most important safety concern with danshen is its interaction with anticoagulant and antiplatelet medications. Because danshen itself inhibits platelet aggregation, combining it with drugs like warfarin or aspirin can alter how those medications work in your body. Animal research found that co-administering danshen with warfarin significantly changed warfarin’s absorption and its blood-thinning effect. Similarly, taking danshen alongside aspirin increased the amount of aspirin and its breakdown products circulating in the blood.
These interactions can be clinically meaningful. If you take blood thinners or antiplatelet drugs for any reason, including heart conditions, stroke prevention, or after a stent placement, combining them with danshen could either amplify or unpredictably alter their effects. This is one of the most well-documented herb-drug interactions in Chinese medicine, and it applies to all forms of danshen, whether taken as raw root, extract, or compound formulations.