1, healthy bean sprouts smell fresh, and bean sprouts with special smells such as urea are abnormal.

2. Try not to choose a head that is too uniform, too thick and too long. These bean sprouts may have added chemicals, so don't choose rootless ones. This may use a rootless proxy.

3. What emerges without water on the stem surface is naturally cultivated bean sprouts, and what emerges with water may be bean sprouts soaked with chemical fertilizer.