sentences:  Under the "Law on Guarding State Secrets", the formula as well as the production processes regarding Yunnan Baiyao are considered secret and possess the longest period of product proprietary secrecy protection of four levels of secrecy under Chinese trade law.As a result, Yunnan Baiyao's exact ingredients are not printed on its packaging in China, and its production process was not disclosed to workers in the factory.Some of the Yunnan Baiyao's products are sold in the US as diet supplements.