Risk-based allergen labeling: reference doses, Japan's 10-ppm policy, and emerging challenges

PURPOSE OF REVIEW: To summarize current advances in risk-based management of unintended food allergen presence, with a particular focus on Japan's unique 10-ppm labeling threshold and precautionary allergen labeling (PAL) prohibition, and to contextualize these within emerging international frameworks based on eliciting doses (EDs) and reference doses (RfDs). RECENT FINDINGS: Quantitative risk assessment has shown that the aforementioned threshold offers a wide safety margin for most consumers allergic to egg, milk, and wheat, with estimated inadvertent exposures below the FAO/WHO RfDs. However, this threshold is associated with overly stringent requirements and a substantial management burden for some allergens, such as crustaceans. The FAO/WHO guidelines, Voluntary Incidental Trace Allergen Labeling (VITAL) 4.0, Codex, and regional initiatives are converging on ED-based RfDs alongside HACCP-based allergen management. In Japan, rapid shifts in nut consumption have altered allergy prevalence and ED distributions, highlighting the need for periodic threshold updates. SUMMARY: Future allergen policy should integrate robust thresholds with realistic, HACCP-based allergen management in packaged foods and food-service settings, anticipate shifting dietary patterns, and support internationally harmonized, evidence-based PAL that enhances the safety and quality of life of food-allergic individuals.