Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Isatis, also known as Isatis tinctoria or "ban lan gen" in Traditional Chinese Medicine (TCM), has been used for centuries in East Asia to help prevent and manage colds and other respiratory infections. Its root and leaf are common components in herbal formulations aimed at "clearing heat," "removing toxins," and supporting the body's defenses against infection. The traditional rationale is rooted in TCM theory rather than modern virology or immunology.

A limited number of laboratory studies have suggested that Isatis extracts may have antiviral and anti-inflammatory effects, but these studies are mostly in vitro or animal-based and do not provide robust clinical evidence for efficacy in humans. There are a few small-scale clinical trials in China, but many have methodological weaknesses, such as lack of blinding, small sample sizes, or insufficient controls. Systematic reviews and Western medical literature generally consider the evidence for Isatis's use in preventing or treating colds to be inconclusive or insufficient.

In summary, Isatis is primarily used for cold prevention based on traditional use in TCM. While there is some preliminary scientific interest in its active compounds (such as indirubin and tryptanthrin), strong, high-quality clinical evidence is lacking. Its use for colds remains rooted in tradition rather than validated by rigorous scientific studies.

More about Isatis
More about Colds (prevention)

Other ingredients used for Colds (prevention)

Other health conditions supported by Isatis

Products containing Isatis