Synopsis

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

Java tea (Orthosiphon stamineus, also known as cat's whiskers) has a traditional history of use in Southeast Asia for various ailments, including as a remedy for hypertension. Scientifically, several preclinical and a small number of clinical studies have explored its potential antihypertensive effects. The plant is rich in bioactive compounds such as flavonoids, sinensetin, rosmarinic acid, and orthosiphols, which are thought to have diuretic, antioxidant, and vasodilatory properties. Animal studies have shown that extracts of Java tea can significantly reduce blood pressure, likely via diuresis and relaxation of vascular smooth muscle.

However, human evidence is limited. A handful of small clinical trials have suggested a modest blood pressure-lowering effect, but these studies often lack rigorous design, have small sample sizes, or use combinations with other herbs. Systematic reviews and authoritative sources, such as the WHO monographs and some pharmacopoeias, note the traditional use and some supportive preclinical data, but generally conclude that more robust clinical trials are needed to confirm efficacy and safety for hypertension management.

In summary, while Java tea's antihypertensive use is justified by both tradition and preliminary scientific findings, the level of scientific evidence supporting its effectiveness in humans is currently weak to moderate (rated 2/5), and it should not be considered a substitute for standard antihypertensive therapies.

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