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Blue butterfly, also known as butterfly bean flower, is rich in vitamins A, C and E, and it can improve immunity, help and promote skin elasticity and collagen, while also supporting the brain, promoting brain vitality, preventing stomach pain, anti-depression, Anti-stress, calm, stop convulsions, ease mood and other natural health effects. The natural blue pigment in the butterfly bean flower is also effective. If you add it to a lemon and make it into a flower tea drink, it is a great drink for your heart and blood vessels. The bubble is blue, and the lemon juice will turn purple. It can be used as a food coloring agent or as a cocktail.