Bird’s nest, also known as the swiftlet nest, is created by the swiftlets using solidified saliva, glutinous strands of starch-like saliva produced by a pair of large salivary glands under their tongue. After being collected, it’s sterilized and consumed as a luxurious soup, especially in Asian countries. It’s particularly prized in China due to its rarity, supposedly high nutritional value, and flavor, believing it promotes good health, especially for the skin.

Experimentally, a bird’s nest has been proven to facilitate cellular regeneration, replenish energy and gain physical strength, accelerate the recovery from disease and improve the immune system functions of human bodies.