Protein Efficiency Ratio Rat Bioassay Studies To Demonstrate That a New Infant Formula Supports the Quality Factor of Sufficient Biological Quality of Protein; Guidance for Industry; Availability
FDA released guidance on using the Protein Efficiency Ratio (PER) rat bioassay to demonstrate sufficient biological quality of protein in new infant formulas. This affects dietary supplement and infant formula manufacturers who must comply with updated testing protocols.
Aforeworn detected this change in the Dietary-Supplement Labeling (FDA) space on July 5, 2026 and published this briefing so affected operators are forewarned rather than caught off guard. It is rated Medium urgency. Infant formula manufacturers, supplement brands producing protein-based products, contract manufacturers, ingredient suppliers should confirm how it applies to their specific situation before acting. There is a time constraint attached: Immediately for new submissions; existing products may need to comply upon next regulatory review or if reformulated.. Acting after that point can mean penalties, a lapsed licence, or lost eligibility — exactly the kind of surprise Aforeworn exists to prevent. Aforeworn monitors Dietary-Supplement Labeling (FDA) continuously and turns every detected change into a plain-English briefing like this one, so you always know first. Forewarned is forearmed.
What changed
FDA issued guidance detailing the PER rat bioassay study requirements for demonstrating that a new infant formula supports the quality factor of sufficient biological quality of protein.
Who it affects
Infant formula manufacturers, supplement brands producing protein-based products, contract manufacturers, ingredient suppliers
What you must do
Review the guidance to ensure any new infant formula submissions include appropriate PER bioassay data. Update testing protocols and documentation accordingly.
Deadline
Immediately for new submissions; existing products may need to comply upon next regulatory review or if reformulated.
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