Rehmanniae Radix, Rehmanniae Root, Di Huang
It was some time in Tang dynasty that a plague broke up along the downstream of Huang He river. Many people died. The county Mayor went to herb King temple in mountain Shen Nong to ask protection. He was offered an herb plant called Di Huang (Huang meant Emperor which meant that it was given by Emperor. He was told that these herb plants grew in a place over the mountain. The Mayor got some people to climb up to the mountains to pick up the herbs. The herbs saved many people’s lives. After the outbreak, people started to plant the herbs and called them Di Huang due to their yellow colour. Huang meant yellow this time not Emperor.
Rehmanniae Radix are cultivated in many provinces on the south of Yang Zi river in China, such as Hu Bei and Zhe Jiang provinces.
They are sweet and a little bitter in taste and very cold, non-toxic in nature. They are attributed to the heart, liver, and kidneys meridians.
Therefore, it clears the heat and cools the blood. It is used to remove toxin from the blood to detoxify, increase body fluid, and reduce thirst. It is also used for breaking fevers, cardiac stimulation, and hemostasis.
Morden pharmacological effects:
1, Rehmanniae Radix have anti-inflammation and anti-oxidation effects. They are effective in treating dermatitis such as atopic dermatitis.
2, They are effective in reducing blood sugar and in restoring STZ-induced pancreatic islet damage.
3, They are effective in activating the autonomic nervous system, but effectively affects vital signs.
4, They are effective for improving cognitive function, antidepressant action, and immunity control, for treating cervical cancer and nephrotic hypertension, and for repairing damaged liver tissue. It can also reduce intestinal peristalsis.
Seok-hee Kim et al J Pharmacopuncture. 2017 Jun; 20(2): 81–88.