These little bottles of green liquid often accompany the Chinese on their travels. Feng You Jing oil can be used to ease aches and pains (though it is less strong in this regard than the lotions and oils that are used specifically for this purpose) but it excels at clearing the sinuses, relieving headache and clearing the mind and helping concentration - just dab a drop on each temple. It is also effective as a mosquito repellent - just dab a drop on the inner knee and elbow, the neck and the wrists and ankles.