I've been to Shangri-La, from Lijiang over, everyone will have more or less plateau reaction, we follow the group has a strong reaction fainted. The main thing is to look at the individual physique. General guide will strongly buy several bottles, in fact, there is no need. Appropriate on the good, mainly for prevention do not wait until the faint before inhaling oxygen. After the arrival of the main look at their nails and lips will be purple, then we should pay attention to, drink more water, good rest are generally no problem.
As for the price varies according to the amount of different, I bought 50 yuan 100 times. There is also a range of 25 to 100