Dokudami is a perennial herb native to Japan, China, and Korea. It has a long-standing culinary use in Asian cooking and has been used for centuries in Ayurvedic traditional medicine.
Known by its scientific name, Houttuynia cordata, dokudami is a flowering plant native to Asia. Dokudami grows mostly in dark, moist areas, sometimes submerged deep in freshwater areas. It’s known as “fishy-smell herb” in Asia because when you press its leaves it produces an odor similar to that of fish.
Researchers have examined the biological behavior of dokudami and extensive research has uncovered surprising revelations about its relation to human health.
When you’reallergic to a substance, your body produces histamine, a compound that initiates an immune response. Studies demonstrate that dokudami has inhibitory effects on histamine release, possibly blocking it and reducing its effects. Researchers have even evaluated dokudami’s effects against allergies and asthma, issues partially characterized by excessive release of histamine.
Dokudami contains potent compounds high in antioxidant activity that battle free radicals. Free radicals have a free, unpaired electron and are often unstable. They damage other compounds, cells, and DNA and research has linked free radicals toaging, cancer and many illness. Dokudami has been billed as an excellent free radical scavenger and helps neutralize circulating free radicals. 
Not all bacteria is bad. In fact you need a balance of bacteria in your digestive system asgood bacteria support digestive system. A recent article has shown that dokudami promotes intestinal balance by discouraging harmful bacteria from thriving in the digestive system. 
Research has shown that dokudami may help support the immune system by stimulating the production of lymphocytes, white blood cells that are crucial for thebody natural defense system. Dokudami, in this case, should be seen as merely a natural component in an overall healthy lifestyle. Exercise, a vegetarian diet, and plenty of sunshine and sleep are also instrumental for supporting immune system function.