Each product manufactured by Zhengzhou Pharmaceutical has an anti-counterfeiting code printed on it that can be used for checking. This way you can be sure that the product you use is legitimate.
You can check it on their website: http://anticounterfeiting.tk/
ZPHC is one of my favorite brands. I have ran several things from them. If anyone has questions feel free to reach out. The test, eq, deca, anadrol and turinabol is absolutely excellent.