The brain consumes a great deal of oxygen. Therefore, the living environment should be well-ventilated to ensure plentiful supply of oxygen. Besides, it is the best for the working environment to be in a natural light with moderate brightness. Intense or weak light may impair eyesight. The working environment should be kept quiet and free from noises. The brain may be injured when the noise surpasses 60 dB. Apart from the above, the room temperature of 16℃ is the most beneficial to maintaining the brain in a refreshing state. More information, please continue to read Radix Polygoni Multiflori (Heshouwu).