FDA Closer to Zero — 20 ppb Lead Action Level for Single-Ingredient Root Vegetables (Baby Food)
Under the Closer to Zero program, the US Food and Drug Administration has established a 20 ppb action level for lead in processed single-ingredient root vegetables intended for babies and young children less than two years of age (FDA CTZ Pb 2025). Single-ingredient root vegetables are held to a separate threshold from other processed vegetable products because carrots and sweet potatoes accumulate lead from soil at rates substantially higher than other vegetable crops, because root vegetables are nutritionally important commodities for this age group, and because at the 10 ppb level applicable to other vegetables the achievability for root vegetables would have been 79 percent, a level FDA considered likely to reduce market availability of these products (FDA CTZ Pb 2025).
Scope
The category of single-ingredient root vegetables, as used in the guidance, means a food that consists of either carrots or sweet potatoes, with or without additional ingredients such as water or preservatives. A puree that consists of sweet potatoes, water, and ascorbic acid is a single-ingredient root vegetable. A puree that consists of carrots, white potatoes, and water is a mixture and not a single-ingredient root vegetable. A puree that consists of sweet potatoes and apples is likewise a mixture (FDA CTZ Pb 2025). This definitional detail matters for enforcement: a two-ingredient product is evaluated under the 10 ppb mixture threshold, not under the 20 ppb single-ingredient root vegetable threshold.
Exact limit and units
Limit parameters from FDA CTZ Pb 2025:
| Parameter | Value |
|---|---|
| Action level | 20 ppb |
| Unit definition | Parts per billion equals micrograms per kilogram (µg/kg) |
| Basis | Whole sample, as sold |
| Analytical method | Inductively coupled plasma mass spectrometry (ICP-MS) |
| Sample composition | 12 randomly selected subsamples from a single lot, per Toxic Elements Program protocol |
Enforcement posture
The action level is non-binding guidance, consistent with the framework that applies to the other matrices under this guidance. FDA may regard a single-ingredient root vegetable baby food with lead at or above 20 ppb as adulterated within the meaning of section 402(a)(1) of the Federal Food, Drug, and Cosmetic Act, and will consider the action level alongside analytical confidence when deciding whether to bring an enforcement action (FDA CTZ Pb 2025).
Achievability assessment
At the 20 ppb action level, 88 percent of single-ingredient root vegetable samples in the combined Toxic Elements Program and FDA survey dataset fall at or below the level. FDA noted that at a hypothetical 10 ppb level (the level applied to other vegetable products), root vegetable achievability would have been 79 percent (FDA CTZ Pb 2025). The occurrence statistics:
| Matrix | n | Mean ± SD (ppb) | 90th percentile (ppb) | 95th percentile (ppb) |
|---|---|---|---|---|
| Single-ingredient root vegetables | 90 | 8.2 ± 7.8 | 20.9 | 23.9 |
Exposure reduction
| Scenario | Mean Pb concentration (ppb) | 90th percentile dietary exposure (µg/day) |
|---|---|---|
| Status quo (no action level) | 8.2 | 0.87 |
| With 20 ppb action level | 5.8 | 0.62 |
Exposure reduction: 29 percent (FDA CTZ Pb 2025). The 90th percentile 2-day average consumption by eaters only, 0 to 23 months, is 106 g/day (FDA CTZ Pb 2025).
Why root vegetables get a separate category
FDA gave two reasons for placing root vegetables in a distinct category rather than folding them into the broader vegetables category with a uniform 10 ppb threshold.
The first reason is toxicokinetic. Root vegetables absorb lead more readily from soil than most other crops. The guidance cites a 2020 sweet potato study (Huang et al., Ecotoxicology and Environmental Safety 203:111012) in the supporting evidence for this pattern (FDA CTZ Pb 2025). The occurrence data reflect the biology: the mean lead concentration in single-ingredient root vegetables (8.2 ppb) is approximately four times the mean for non-root vegetables (2.1 ppb), and the 95th percentile (23.9 ppb) is approximately three times the non-root 95th percentile (7.0 ppb) (FDA CTZ Pb 2025).
The second reason is nutritional availability. Carrots and sweet potatoes are sources of beta-carotene, dietary fiber, potassium, and other nutrients relevant to infant growth and development. An action level set at 10 ppb would have achieved 79 percent compliance in the existing supply, which FDA judged likely to reduce market availability of these foods enough to outweigh the marginal exposure reduction. The 20 ppb level accepts a higher residual exposure in exchange for preserving supply (FDA CTZ Pb 2025).
Reference value context
See fda-ctz-Pb-babyfood-10ppb for the IRL derivation. The 2.2 µg/day IRL for children is the same reference value against which all three action levels under this guidance were evaluated.
History
See fda-ctz-Pb-babyfood-10ppb for shared program history. The draft guidance issued under docket FDA-2022-D-0278 preceded this final January 2025 version; sample size in the achievability dataset increased by 594 samples between draft and final (FDA CTZ Pb 2025).
Comparison to EU, Codex, and state rules
For the Category 1 lead comparison layer, see lead-benchmark-context. EU Regulation 2023/915 maps covered baby food to 20 ppb lead as placed on the market, so the EU value aligns numerically with FDA’s single-ingredient root-vegetable lead action level. California Proposition 65 remains exposure-based; using FDA’s 110 g ready-to-serve infant-food reference amount, the 0.5 ug/day lead MADL converts to about 4.5 ppb for 110 g/day.
Parent program
Sources
- FDA CTZ Pb 2025 (evidence tier A, US government work)