#joy. Blue butterfly pea flowers also known as Blue tea or Asian pigeonwings are natural herbs with wonderful health benefits. Which is a caffeine-free herbal tea. This is the most beautiful tea which is very common in south-east Asia. Butterfly pea flower tea makes an amazing color drink. When mixed with lime & lemon it changes color(blue color would change to purple ). This butterfly pea tea are not only beautiful for the eyes, they are also good for your health. Benefit : Effective for weight loss, Controls blood sugar level, Relieves pain, Improve eyesight & Improve hair growth.