Buy Guyuan ointment online, don't be greedy for cheap, cheap Ejiao is definitely not good, either fake Ejiao or cut corners. The most important effect of Guyuan ointment lies in the quality of Ejiao. Whether the Guyuan cream you bought is good or not depends on whether he uses real Ejiao. If it's Fupai Ejiao or Dong 'e Ejiao, that's fine. If you use other Ejiao, I won't say much. Think about the quality yourself. I want to buy something that doesn't buy miscellaneous brands anyway, so I will look for the Guyuan cream made by Fupai Ejiao. Fupai Ejiao has a long history and is the most authentic. Its quality is even better than Dong 'e Ejiao, but it doesn't advertise, so the price is more affordable. You can search online for a shop called Fushantang, which is a Fupai Ejiao store. Guyuan ointment must be genuine.