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NewsRegulatoryTesting & AnalysisMethodsFDAGuidelines

FDA Issues Guidance on Protein Quality Testing for Infant Formula

By Food Safety Magazine Editorial Team
full baby bottle on a pink blanket
Image credit: fabrikasimf via Magnific
May 21, 2026

The U.S. Food and Drug Administration (FDA) has issued final guidance for manufacturers of infant formula and laboratories conducting testing on infant formula.

The guidance was developed to help manufacturers and laboratories in the design, conduct, evaluation, and reporting of Protein Efficiency Ratio (PER) studies. PER studies are used to assure the quality of the protein in infant formulas.

The guidance is intended to help industry, particularly those looking to introduce new infant formula to the U.S. market, by outlining how PER studies can be conducted to meet FDA’s requirement that a new infant formula meets the quality factor of sufficient biological quality of protein.  

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KEYWORDS: infant formula protein quality assurance

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The Food Safety Magazine editorial team comprises Bailee Henderson, Director of Content Strategy and news editor ✉, and Adrienne Blume, M.A., Director of Editorial and Industry Engagement.

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