Blood bird's nest refers to the blood that flows out of the swallow's throat or mouth after being injured during the bird's nest production process, and the blood that coagulates on the surface of the bird's nest. Because the production of blood bird's nest is less and it contains some special ingredients, its price is usually more expensive than ordinary bird's nest.

The difference between blood bird's nest and ordinary bird's nest lies in its color, shape and nutritional content. Blood bird's nest is dark red or brownish red, irregular in shape, and usually purer than ordinary bird's nest. In addition, blood bird's nest contains more iron and other nutrients, and is more nourishing than ordinary bird's nest.

According to traditional Chinese medicine theory, blood bird's nest has the effects of nourishing yin and moistening the lungs, relieving cough and reducing phlegm, invigorating qi and nourishing blood, strengthening tendons and bones. It is suitable for people with qi and yin deficiency, lung deficiency cough, anemia, etc.