Vietnamese Coriander, or Rau Răm, is a perennial herb that thrives in tropical and subtropical climates, particularly in hot and humid conditions. Its leaves and young stems are widely used and add a distinctive flavor to Vietnamese cuisine.
Botanically known as Persicaria odorata, Vietnamese Coriander also goes by other names such as Daun kesum or Daun lak in Malaysian, and Lặc sa diệp in Chinese.
The main chemical constituents of Vietnamese Coriander include long-chain aldehydes such as decanal (28%), dodecanal (44%), and decanol (11%) found in its essential oil. Sesquiterpenes, including α-humulene and β-caryophyllene, make up about 15% of the essential oil.
The Benefits and Drawbacks of Vietnamese Coriander
1. Benefits of Vietnamese Coriander
In traditional East Asian medicine, Vietnamese Coriander is believed to have a warm and spicy character. It is used to strengthen the spleen and stomach, aid digestion, and dispel dampness. It is commonly employed in cases of stomach coldness, indigestion, and rheumatism. It is often added to dishes with cooling properties or those that are difficult to digest.
Additionally, Vietnamese Coriander is nutrient-rich and offers various health benefits. The seeds, when decocted with Mexican marigold, are used to treat cholera (characterized by vomiting and frequent diarrhea). The roots, when decocted in alcohol, can alleviate heart pain. When crushed and applied topically, the fresh herb can treat skin infections such as ringworm, tinea versicolor, and scabies, as well as snakebites.
2. Drawbacks of Excessive Consumption
Despite its myriad benefits, excessive consumption of Vietnamese Coriander can have negative effects on health.
Impact on Libido
Regular and excessive consumption of Vietnamese Coriander can lead to an imbalance of heat and cold in the body, resulting in reduced libido and sexual function in both men and women. It is believed that the herb can deplete “jing,” which is the essence of life force and reproductive energy.
In men, this can manifest as decreased sexual desire and erectile dysfunction, while women may experience disruptions in their menstrual cycle.
Potential Risk During Pregnancy
Due to its spicy and warming nature, as well as its ability to stimulate qi and blood flow, Vietnamese Coriander is contraindicated during pregnancy. Its stimulating effect on the uterus may induce contractions and pose a risk to the pregnancy.
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