Good Manufacturing Practices are used to prevent introduction of undeclared allergens.

良好生产规范是用来防止未申报的过敏原介绍。

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Suppliers must conform to good manufacturing practices and to internationally recognized quality standards.

供应商的生产必须符合规定，并达到国际质量认证标准。

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Quality Assurance: IQPP certified plasma centers are based on compliance with current Good Manufacturing Practices (GMP).

质量保证：国际质量血浆项目鉴定中心是以当前良好的制造规范(GMP)为基础的。

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"The ITA represents reputable small businesses throughout the U.S. that already adhere to the highest professional standards including good manufacturing practices, " the group said.

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The FDA is very demanding and has a standard set of Good Manufacturing Practices to which all ingredient manufacturers as well vitamin or supplement manufacturers using these ingredients must comply to.

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In my opinion, the best solution would be to go with a brand that carries the seal of USP or NSF, two nonprofit organizations that certify that vitamins are contaminant free and made according to good manufacturing practices.

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