The extraction purity is high. The specification of belladonna is 2 mg (calculated by polypeptide), that is to say, the polypeptide contained is 2 mg, and the purity is very high. The specification of the extension is only 2 mg, indicating that the actual amount of polypeptide contained is less than 2 mg, and the purity is not high. This means that Bellevue is more expensive than Foktor, mainly because of its high purity.