Bringing whey protein powder through custom

I'm traveling to Beijing and Yunnan Province for a 2 month research and study stay. I train every day (strength and running training) and use whey protein powder as a supplement to my food. While I'm in China I would like to continue to use whey protein powder.
My question is are there any problems taking it on a flight to China and go through customs with it? I mean, protein powder can look alittle suspicious and I don't want to cause great confusion at the customs at the airport, but I will also be sorry to do without it because I care a lot about my training.

I hope somebody can help clearify it for me. In advance thank you very much!! :-)