Yanzhan.

Yanzhan is to select nest-shaped or boat-shaped bird's nests from the collected bird's nests, and then sell them after small plucking. The cup shape is taken out naturally, so the shape and size are different. Its nutrition, fragrance and hair are all the best.

Yanzhan can nourish the lungs and nourish yin, relieve cough due to lung deficiency, reduce lung-qi lesions, nourish the deficiency and nourish the stomach, relieve stomach coldness, make people's skin smooth, elastic and shiny, thereby reducing wrinkles, etc. effect. The denser the fiber of the bird's nest should be, the better. The shape should be rough and complete. Natural bird's nests will have a slight fishy smell. Choose those with rough appearance and different colors. Generally speaking, a good bird's nest should have thin and dense silk. The overall shape is better, it has a little fishy smell, it feels dry and has a small amount of fine hair, and the horns are relatively thin. In addition, the color of bird's nest can be divided into shades, light and dark. This is because swallows do not eat pure white food every day, so their saliva will not be pure white. If the color is too white and there is no hair at all, it was probably rinsed.