FDA 2020 — Supporting Document for Action Level for Inorganic Arsenic in Rice Cereals for Infants
This U.S. FDA government document provides the background and rationale for the 100 µg/kg (100 ppb) action level for inorganic arsenic (iAs) in rice cereals for infants. It draws on FDA’s risk assessment for arsenic in rice and rice products (published 2016, peer-reviewed) and three rounds of market surveillance (2011-2013, 2014, and 2018) to demonstrate both the public health basis and achievability of the 100 ppb limit. It is the companion supporting document to the “Guidance for Industry: Inorganic Arsenic in Rice Cereals for Infants: Action Level” and should not be confused with that guidance or with the underlying risk assessment report. This wiki already carries the guidance itself at fda-iAs-rice-cereal-2020.md.
Key numbers
Three surveillance datasets for U.S. infant rice cereals:
2011-2013 dataset (n=81): mean iAs 116.7 ppb (SD 43.3), 90th percentile 183.4 ppb, range 39-254 ppb. Achievability at 100 ppb: 36% of samples met the limit.
2014 dataset (n=76): mean iAs 103.1 ppb (SD 24), 90th percentile 126.4 ppb, range 21-176 ppb. Achievability at 100 ppb: 47% of samples met the limit.
2018 dataset (n=149): mean iAs 85 ppb (SD 21), 90th percentile 107 ppb, range 22-142 ppb. Achievability at 100 ppb: 76% of samples met the limit.
The downward trend across sampling periods (mean 116.7 → 103.1 → 85 ppb) is cited as evidence that selective sourcing by manufacturers is already driving iAs reduction, making the 100 ppb action level achievable under current good manufacturing practices.
Cancer risk reduction modeled from the 100 ppb limit: 37% reduction in lifetime cancer risk attributable to brown-rice infant cereal consumption; 18.8% reduction for white-rice infant cereal consumption (based on 2016 FDA risk assessment).
Modeled effect of the 100 ppb limit on mean iAs concentrations if non-compliant cereals are removed from market: brown-rice cereals from 119.0 ppb to 79.0 ppb; white-rice cereals from 103.9 ppb to 83.5 ppb.
Achievability at hypothetical thresholds, 2011-2013 dataset: 75 ppb = 20%, 100 ppb = 36%, 125 ppb = 62%, 150 ppb = 84%. Achievability at hypothetical thresholds, 2014 dataset: 75 ppb = 3%, 100 ppb = 47%, 125 ppb = 89%, 150 ppb = 95%. Achievability at hypothetical thresholds, 2018 dataset: 75 ppb = 33%, 100 ppb = 76%, 125 ppb = 99%, 150 ppb = 100%.
Baseline estimated lifetime cancer risk attributable to infant white-rice cereal consumption: 1.6 cases per million. For infant brown-rice cereal: 1.9 cases per million (per capita basis, children under 1 year, from Risk Assessment Table 5.1).
Methods (brief)
This is a regulatory supporting document, not a primary study. Analytical data comes from three FDA sampling programs cited as separate reports (Refs. 9-11 in this document). The 2011-2013 dataset combined 69 FDA-analyzed samples with 12 Consumer Reports samples. The 2014 dataset comprised 76 FDA-analyzed samples. The 2018 dataset comprised 149 FDA-analyzed samples. FDA’s official method for iAs in rice is posted separately (https://www.fda.gov/media/95197/download). The risk assessment drew on a dose-response model for iAs and lung/bladder cancer using Taiwanese drinking-water exposure data (Chen et al. 2010a, 2010b). Cancer risk estimates are for lung and bladder cancer combined.
Implications
Certification: This document establishes the U.S. regulatory floor for iAs in infant rice cereal at 100 ppb. HMT&C thresholds for infant rice cereal should reference this document alongside fda-iAs-rice-cereal-2020.md (the guidance itself) and fda2016-arsenic-rice-risk-assessment.md (the underlying risk assessment). The 36% achievability in 2011-2013 rising to 76% by 2018 documents the trajectory; HMT&C can cite the 2018 distribution when establishing a tighter precautionary limit. The 2018 90th percentile of 107 ppb means a 100 ppb HMT&C standard already positions certified products well within the achieved range by 2018.
Courses: Illustrates the FDA regulatory process: action level vs. tolerance, achievability assessment as a complement to risk assessment, and how surveillance data from multiple years informs standard-setting. Also illustrates that a 100 ppb limit does not eliminate risk but substantially reduces it, which is the basis for HMT&C’s ratcheting approach.
App: The 2018 distribution (mean 85 ppb, 90th pctile 107 ppb, range 22-142 ppb) provides the most current U.S. market baseline for infant rice cereal iAs. The app should use this as the reference distribution for U.S.-market rice-based infant cereals when no brand-specific data is available.