Sadly Wang Ming didn't have many medicinal herbs at his home, most is only normal ingredients he uses in his cooking. They are 'healthy' ingredients that supply the body with vitamins and minerals. The only proper medicinal herb he had in his home is ginger.
Hopefully, he could get his hands on ginseng, dong quai, rhubarb, ling zhi ect. He needed something that could replenish life energy. Even though ginger could in the theory work, a ginseng is much more effective in replenishing energy.
Since Aunt Fu's injured, her body uses a lot of energy to heal her body. The more energy she has, the faster the healing process can be. His only problem was the clock, how could he get a ginseng at night. Even if he went to a herb shop now, most likely, it would be closed.