GMP certification primarily is concerned with quality of the manufacturing process. It is that part of quality assurance that ensures that cosmetics products are consistently produced and controlled to the quality standards appropriate to their intended use and as required by the marketing authorization. It is concerned with all aspects of production and quality control.
GMP is aimed primarily at diminishing the risks inherent in any cosmetics production, which may broadly be categorized into two groups: cross contamination/mix-ups and false labeling. Above all, manufacturers must not place clients at risk due to inadequate safety, quality, or efficacy.
Additional tenets include ensuring the end product is free from contamination, that it is consistent in its manufacture, that its manufacture has been well documented, that personnel is well trained, and that the product has been checked for quality more than just at the end phase.
Good Manufacturing Practices (GMP) of cosmetic products are mandatory in the EU, and are highly recommended by many other countries, such as the United States.