Stop in for a cup of coffee

I should bring you all some bottles of this Xau Xanh.( Green Oil ). There aint a woman in Viet Nam that doesn't have one in her purse. Lol. It's a fix everything ointment to them. They put it on their temples if headache. On the ears. On the throat if sore. Got a tummy ache? Yup on the navel.She even trys to rub it under my nose before sleep. Never heard of it till I came to VN...
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Does it work?