About Da Qing Ye
TCM 'heat-clearing, blood-cooling' herb derived from the leaf of the same plant as Ban Lan Gen (Isatis Root) but with distinct chemistry and traditional indications — Da Qing Ye is traditionally used for high fever, sore throat, and skin eruptions. Higher indigo and indirubin content than the root. In-vitro antiviral and anti-inflammatory signals exist; no high-quality RCTs in Western literature support clinical efficacy in healthy adults. Indirubin has been studied separately as an anti-leukemic compound, but those findings do not transfer to whole-leaf supplement dosing. Caution with anticoagulants given platelet-modulating constituents.
What Da Qing Ye supports
- TCM herb traditionally used for 'heat-clearing' during fever and sore throat
How much Da Qing Ye to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
500–1500
mg
Traditional use only — no clinical efficacy threshold established. TCM decoction equivalent is 9–15 g raw leaf; even at a 10:1 extract ratio the floor sits at ~900 mg. Sub-500 mg supplement doses are folk-symbolic, not translated decoctions.
Clinical evidence
Limited clinical evidence. No modern RCTs in healthy adults; traditional use only.
Reference