Genuine bird's nests are mainly produced in Southeast Asia, with countries such as Indonesia, Malaysia, Thailand and Vietnam being the most famous. These regions have suitable climatic and environmental conditions that help swallows to nest and grow. Swallows build their nests in cliffs and caves, using their own saliva and feathers to form nests. Such nests are rich in collagen, amino acids and other nutrients. Therefore, bird's nests from these places are the best and most authentic.