The edible bird's nest chosen are all constructed on the dangerously steep grotto and cliff during the nesting period and from  the area of South Asia, such as Indonesia, Thailand, Vietnam, etc. Its efficacy is to treat Yin deficiency by reinforcing body fluid and nourishing the blood, to nourish body dryness, to promote cell's regeneration as well as immune function, and to play a role in maintaining youth. It is indeed a valuable desert before or after a meal.