Since the Food and Drug Administration do not regulate ginkgo and other supplements, potency and purity vary from brand to brand.

美国食品与药物管理局尚未对银杏制剂和其它保健品进行规范化管理，商标不同，药品的效力和纯度也不一样。

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Since the Food and Drug Administration do not regulate ginkgo and other supplements, potency and purity vary from brand to brand .

美国食品与药物管理局尚未对银杏制剂和其它保健品进行规范化管理，商标不同，药品的效力和纯度也不一样。

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Control the quality of drug products during production to ensure that they meet standards of potency, purity, uniformity, stability and safety.

在生产过程中控制药物产品的质量，以确保它们符合效价，纯度，均匀性，稳定性和安全标准。

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Markowitz says the drug has modest potency, but is undergoing a trial in combination with interferon and ribavirin that may show better results.

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"This means that drug developers have had to modify toxins to retain their potency and make them safe for drug use, " said Dr Casewell.

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Until April 2010 it was considered a "legal high", but given its potency and powerful side effects the drug was reclassified.

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