Houttuynia cordata, also known as fishy smelling herb because of the strong odor as being freshly cut, has long been used in Asia as a kind of wild herb. Houttuyniae has good clinical functions such as assisting body fluid circulation, clearing heat, and resolving toxin. It is an important herb in many traditional medicine systems well indicated in its Japanese name Dokudami, which means “poison blocking plant”.


Usually people take it as an appetizing food. The leaves, stems and rhizomes of houttuynia are widely used in south-east Asia, both fresh and cooked. It is used as an aromatic vegetable/spice and is added to salads, soups, stews, fish meals, curry dishes and stir-fries. It can also be used for daily health care due to its health benefit.


The components of houttuynia include evaporating oil and flavonoids. The evaporating oil mainly composed of decanonyl acetaldehyde (houttuyfonate) and lauric aldehyde. These 2 elements have unique and strong odor which result in the fishy smell as grating the fresh stems and leaves. The smell disappears when dried because decanonyl acetaldehyde is unstable and easy to decompose into odorless methyl-n-nonyl ketone. The other components include α-pinene, linlool, camphene, myrcene, limonene, bonyl acetate, caryophellene, etc.


The flavonoids in houttuynia include afzelin, hyperin, and nutin. Inside the leaves contains auercitrin and inside its flower and ears contain isoquercitrin.


In addition, there are alkaloids like cordarine, organic acids like chlorogenic acid, and esters including β-sitosterol, stearic acid, oleic acid, linoleic acid, etc. It is also rich in potassium, magnesium and sodium.


Dalong Biotechnology obtained houttuynia from Taichung District Agricultural Research and Extension Station, council of Agriculture. These houttuynia were cultivated through contract farming by outstanding farmers and guarded seriously to ensure the quality.


In the process of extracting houttuynia, houttuyfonate, one of the most important ingredients within, is easy to get lost with the evaporating oil. Dalong Biotechnology extracts houttuynia with the steam distillation skill to keep the essential functional ingredient. The antibacterial tests were conducted to see the bacteriostatic effect of the houttuynia extraction.


Antimicrobial test report