Deep Dive: FDA Proposes First Major Update to Infant Formula Nutrient Standards in Nearly 30 Years

Background

Infant formula nutrient standards in the United States have not had a comprehensive update since 1998. Under the Federal Food, Drug, and Cosmetic Act, the FDA is expected to review these requirements periodically so they reflect the best available science on infant growth and development. For many families, formula is the sole or primary source of nutrition for the first months of life, so the minimum and maximum levels of the 30 required nutrients matter for thyroid function, bone development, vision, immune support, and overall growth.

Operation Stork Speed, launched in March 2025 as part of broader administration priorities, directed the FDA to expand options for safe, reliable, and nutritious formula, increase contaminant testing, and modernize the nutrient framework. Earlier this year the agency issued a Request for Information; the comment period closed in September. Today’s action is the first formal proposed rule from that review.

What changed on October 29

The FDA issued a proposed rule covering the first phase of its three-phase review of the 30 required nutrients. The rule would update or reaffirm specifications for eight nutrients and invite input on others commonly added by manufacturers.

Key proposed changes (per 100 kcal):

1. Iodine: Minimum rises from 5 µg to 15 µg; maximum falls from 75 µg to 50 µg. Iodine supports thyroid hormone production and early brain development.
2. Manganese: Minimum drops from 5 µg to 1 µg; a new maximum of 50 µg is established. Manganese supports enzyme function and bone development.
3. Vitamin A: Units shift from International Units to microgram retinol activity equivalents (µg RAE). Minimum moves to 70 µg RAE; maximum to 120 µg RAE. Only preformed vitamin A (not beta-carotene) would count toward the limits. Vitamin A supports vision, immune function, and cell growth.
4. Vitamin D: Units shift to micrograms. Minimum rises from 1 µg (40 IU) to 2 µg (80 IU); maximum rises to 3 µg (120 IU). Vitamin D supports bone and tooth development and helps prevent rickets.
5. Chloride, potassium, selenium, and sodium levels are reaffirmed as appropriate.
6. Labeling requirements would be updated to match the new units and limits.
7. Public comment is requested on potential requirements for nutrients such as arachidonic acid (ARA), docosahexaenoic acid (DHA), and L-carnitine, which manufacturers often add and which have evidence linking them to neurodevelopmental support.

The FDA also released new chemical contaminant testing results (arsenic, lead, mercury, cadmium, PFAS, pesticides, and others). Across the market-basket samples examined, most formula products showed low or non-detectable levels of contaminants. The agency launched an Infant Formula Testing Webpage and Chemical Contaminants Dashboard so parents and clinicians can review the data. This aligns with the Closer to Zero initiative aimed at reducing childhood exposure to heavy metals in food.

The comment period runs until February 26, 2027 (120 days from Federal Register publication). Docket: FDA-2026-N-10832 / FDA-2026-56789. Comments can be submitted at regulations.gov. The agency plans two more proposed rules covering the remaining nutrients, then a single comprehensive final rule. Compliance would be expected three years after the final rule’s effective date so manufacturers can reformulate and relabel.

Competing viewpoints

Supporters, including HHS Secretary Robert F. Kennedy Jr. and FDA leadership, frame the proposal as a long-overdue modernization that aligns U.S. standards with current science on human milk composition and infant needs. They emphasize that current formulas remain safe and that the changes are proactive rather than driven by an immediate safety crisis. The simultaneous release of contaminant testing data is presented as building parent confidence: most samples tested clean, and results are now publicly available.

Critics and cautious observers note that any nutrient-limit change can affect manufacturing costs (the FDA estimates annualized costs in the $8–32 million range, primary estimate ~$17.6 million) and that reformulation takes time. Some nutrition scientists have long argued that U.S. minimums for certain micronutrients lag behind other countries or human-milk reference values; others caution that raising minimums or lowering maximums must be validated so that no subpopulation (for example, infants with higher needs or those on specialized formulas) is left short. The decision to count only preformed vitamin A, excluding beta-carotene, and the new manganese ceiling may draw technical debate about bioavailability and safety margins. Finally, because the review is phased and the full set of changes will not be final for years, some families and clinicians may feel the update arrives slowly relative to the pace of infant-nutrition research.

What to watch next

1. Public comments through late February 2027 and any revisions the FDA makes in response.
2. Phase 2 (B vitamins, vitamin C, choline, inositol, etc.) and Phase 3 (protein, fat, iron, calcium, DHA/ARA, carbohydrate sources) proposed rules.
3. Peer review of the scientific basis under the Information Quality Act.
4. Manufacturer reformulation timelines and any temporary supply effects once a final rule is issued.
5. Updates to the contaminant dashboard and progress toward formal action levels under Closer to Zero.
6. Whether the agency ultimately requires (or continues to leave optional) DHA, ARA, and L-carnitine.

Current formulas on store shelves remain the regulated, safe products available today. Families with specific concerns about nutrient levels or medical conditions should consult their pediatrician or a registered dietitian. The proposed rule is open for comment; parents, clinicians, and others can submit views at regulations.gov.

Sources: HHS press release, FDA proposed rule page and Federal Register notice, FDA contaminant testing results, Reuters, Contemporary Pediatrics, CNN.