Bird's nest itself is a tonic, which has the function of whitening, nourishing yin and moistening lung. Yan's bird's nest can be added for free I bought it at a treasure that day and it arrived the next day. This is really a newly stewed bird's nest. Haha ~ Generally, the shelf life of ready-to-eat bird's nest is one year, while the shelf life of Yan's stewed bird's nest is only 15 days, which really guarantees the real taste and nutrition of bird's nest.