Bringing a new food contact substance to the US market without a premarket review is not an option. Since 2000, the US FDA has required a FDA food contact notification (FCN) for most new substances that contact food, and the toxicology data expectations behind an effective FCN have tightened year after year. This guide walks through what an FCN actually requires in 2026: the data tiers, the dietary exposure estimate, the migration evidence, and the toxicology package that reviewers now expect.
What the FDA food contact notification pathway achieves
An FCN authorises a specific sponsor to market a specific substance for a specific food-contact use. Unlike older GRAS self-affirmation or Food Additive Petition pathways, the FCN is sponsor-specific and intended to be a streamlined, 120-day review. It is the primary route into the US market for new plasticisers, adhesive components, polymer production aids, antimicrobials, and similar substances.
FDA publishes the inventory of effective FCNs on its website. Every sponsor who wishes to use a substance must either have their own FCN, rely on an authorised generic listing in 21 CFR, or file a new FCN. The FDA food contact notification system is therefore the main mechanism by which the US food contact substances inventory grows.
Dietary exposure: the number that drives the toxicology tier
Every FDA food contact notification is anchored on the Estimated Daily Intake (EDI) for the substance. The EDI is calculated from the Consumption Factor (CF, the fraction of the US diet represented by the intended food-contact application) and the food-type distribution factor (f<sub>T</sub>, accounting for aqueous, acidic, fatty, and other food categories), multiplied by the worst-case migration level.
FDA publishes default CF values in its guidance for industry on preparing FCNs. The EDI threshold determines the toxicology data tier:
- EDI < 0.5 µg/person/day (0.15 ppb in the diet): minimal toxicology data required, Threshold of Regulation pathway applies.
- EDI 0.5-150 µg/person/day (0.15 ppb to 50 ppb): genotoxicity and subchronic data expected.
- EDI 150-3000 µg/person/day (50 ppb to 1 ppm): full subchronic, reproductive screening, and extended genotoxicity data expected.
- EDI > 3000 µg/person/day: chronic toxicity, carcinogenicity, and multigenerational reproductive studies expected.
The FDA food contact notification toxicology data package
Tier 1: genotoxicity
A standard Ames test and an in vitro chromosomal aberration or micronucleus test cover the baseline. If either is positive, a follow-up in vivo study is required, and a positive in vivo result usually pushes the substance out of the FCN pathway entirely.
Tier 2: subchronic toxicity
A 90-day rodent study is the workhorse for EDI in the 50 ppb to 1 ppm range. Endpoints include body weight, food consumption, clinical chemistry, haematology, gross pathology, and histopathology. The NOAEL from this study is the basis for the Acceptable Daily Intake (ADI) that must be greater than the EDI by an appropriate uncertainty factor (typically 100 or 1000).
Tier 3: chronic and reproductive
For high-exposure substances, a chronic bioassay (typically 2-year rodent) and a multigenerational reproduction study are expected. FDA accepts OECD test guideline data for all tiers, which simplifies reuse of data generated for EU or Asia-Pacific filings.
Supporting data
Pharmacokinetics, metabolism, and specific target-organ studies may be requested depending on substance class. Structural alerts for endocrine disruption or developmental toxicity increasingly trigger additional requests, particularly for bisphenols, phthalate analogues, and per-and-polyfluoroalkyl substances. FDA’s FCN program page is the authoritative source on current expectations and an invaluable reference when scoping the toxicology plan.
Migration testing in the FDA food contact notification
Migration studies must mimic the intended food contact conditions. FDA’s 21 CFR 176.170 provides simulant and condition combinations broadly similar to the EU framework but with notable differences: 10% ethanol for aqueous and alcoholic foods, 50% ethanol for higher-alcohol applications, Miglyol 812 or food oil for fatty foods, and 3% acetic acid for acidic foods. Time and temperature pairs cover hot-fill, retort, microwave, refrigerated, and frozen storage.
The worst-case migration level across the intended use matrix is the number that feeds into the EDI calculation. Every FDA food contact notification dossier therefore depends on an analytical method validated to a limit of quantification below the target migration.
Common deficiencies in FDA food contact notification submissions
Deficiency 1: EDI calculation errors. Using optimistic CF values or misclassifying the food-type distribution is the number-one reason for clarification requests. FDA reviewers recalculate.
Deficiency 2: Inadequate migration study design. Single-simulant studies, insufficient replication, or unjustified time/temperature choices can force a restart of the analytical workstream.
Deficiency 3: Missing NIAS evaluation. Non-intentionally added substances, degradants, impurities, reaction products, need the same EDI-driven evaluation as the main substance. Omitting this is a common gap. See our Read-Across Assessment method for evaluating NIAS without compound-specific data.
Deficiency 4: Outdated genotoxicity battery. Legacy data generated under older OECD guidelines may not pass current acceptability criteria. FDA can request repeat studies.
Deficiency 5: Weak identity and purity documentation. The FCN substance must be chemically defined, with a clear specification and an analytical method to verify it. Loosely defined polymer or mixture sponsors face immediate deficiency letters.
Timing and strategy for the FDA food contact notification
An FCN has a statutory 120-day review clock, but the real timeline is often longer due to clarification rounds. Sponsors who invest in a pre-submission meeting with FDA, a well-scoped toxicology plan, and a migration study that addresses every relevant use case typically achieve first-review approval without rework. Our Toxicology Monographs are frequently used to accelerate FCN preparation by providing verified tolerable-intake derivations for the regulated substance, NIAS, and degradation products.
For cross-border strategy, consider that an EU 10/2011 dossier and a US FCN have significant overlap in data but differ in exposure assumptions and reporting format. Our earlier piece on EU 10/2011 migration testing maps the European side of the workstream.
How ToxLibrary supports your FCN programme
If your team is scoping a new FDA food contact notification, responding to a deficiency letter, or weighing whether a substance qualifies for the Threshold of Regulation pathway, we can help. Our toxicologists have contributed to FCNs for polymer additives, polymer production aids, and novel antimicrobial formulations. Reach out, a well-constructed toxicology narrative is the fastest route through the 120-day clock.
