Bird's nest has high nutritional value.

Bird's nest refers to the saliva secreted by some of the swiftlets of the Rainbird family of the order Rainbird and several species of swiftlets of the genus Swiftlet, and then mixes with other substances to build nests, also known as bird's food, bird's root, bird's vegetables, bird's nests according to the nesting place can be divided into the "House Swiftlet" and the "Cave Swiftlet" two kinds of bird's nests. "Cave Swallows have different colors due to the minerals in their nests, such as white, yellow, and red, while Roof Swallows have only one color, ivory white.

Bird's nest is one of the most valuable traditional foods consumed in China since the Ming Dynasty, and the so-called "blood bird's nests" on the market are rumored to be made from artificially farmed swiftlets through the "dung fumigation method". The main nutrient in bird's nest is protein, which has one kind of essential amino acid (lysine) and three kinds of conditionally essential amino acids, while the human body needs 8 kinds of essential amino acids and 13 kinds of conditionally essential amino acids.