The medicine for nourishing yin is Lycium barbarum L., which is also used as medicine and food. The dosage can be slightly larger, ranging from 5 grams to 1 grams. There are several ways to eat Lycium barbarum L., one is to take it directly, because it has a slight sweetness; Take another one in water. Lycium barbarum can nourish yin and strengthen yang. Compendium of Materia Medica calls it nourishing kidney, moistening lung and improving eyesight. 3 grams of Lycium barbarum is about 8.