FDA clears inactive baker's yeast as a vitamin D2 source in four food groups

The U.S. Food and Drug Administration has added a new permitted source of vitamin D to the food supply. In a final order effective 25 September 2026, the agency amended its food additive regulations "to provide for the safe use of vitamin D2 inactive bakers yeast as a source of vitamin D2 in specific food categories," acting on a petition filed by the ingredient maker Lallemand Inc. [s1].

What the order allows

The rule concerns an ingredient, not a product on the shelf. Inactive baker's yeast — yeast that has been treated so it no longer leavens — can be processed to contain vitamin D2 (ergocalciferol), the plant- and fungus-derived form of the vitamin. The order lets food manufacturers use that yeast as a vitamin D2 source in four defined categories, each with a ceiling on how much vitamin D2 the finished food may contain, measured in International Units per 100 grams as served [s1].

The maximum use levels are: breakfast cereals, 350 IU per 100 g; grain products and pasta, 90 IU per 100 g; milk products, 89 IU per 100 g; and milk, 42 IU per 100 g [s1]. Those ceilings are not new numbers. The FDA states that the maximum use levels for vitamin D2 inactive baker's yeast "are the same, on a vitamin D2 basis, as those for vitamin D2 mushroom powder," an ingredient the agency approved in 2020 [s1][s2].

That equivalence is central to the agency's safety reasoning. Because the limits match an already-approved source, the petitioner concluded that the new use "would not increase the cumulative dietary exposure to vitamin D," and referenced the FDA's existing estimate of how much vitamin D Americans already get across the diet [s1]. In food additive law, the question the agency must answer is whether a use is safe at the expected level of exposure — not whether a nutrient is beneficial — and the matched ceilings keep total projected intake within the range the FDA had already evaluated [s1]. That cumulative-exposure test is why the agency anchored the new ingredient to an existing one rather than setting fresh limits: holding the ceilings identical, on a vitamin D2 basis, to those for mushroom powder let the FDA rely on an exposure assessment it had already completed [s1][s2].

How it fits the existing rules

Vitamin D reaches American food through a patchwork of authorisations built up over decades. The order notes that vitamin D is affirmed as "generally recognized as safe" for use in infant formula and in margarine, and that vitamin D2 is already an approved additive for plant-based beverages marketed as milk alternatives, plant-based yogurt alternatives, and several soy-based products [s1]. Vitamin D3 — the form made in skin and found in animal foods — carries its own separate approvals, including certain fortified fruit juices and meal-replacement products [s1].

The new order slots inactive baker's yeast into that structure as one more permitted way to deliver vitamin D2, alongside the mushroom-powder route cleared in 2020 [s1][s2]. For manufacturers, it widens the menu of fortification ingredients; for the label, a product fortified this way would still show vitamin D in its Nutrition Facts and declare the yeast-derived source in its ingredient list, as any food additive must.

What it means for a reader

This is a supply-side authorisation, and it carries no dietary advice. It does not change how much vitamin D anyone needs, nor does it recommend fortified foods over other sources. What it does is give food companies another sanctioned tool to raise the vitamin D content of cereals, grains, milk and milk products up to the stated caps — the same caps that already apply to mushroom-powder fortification [s1].

The decision also illustrates how incremental food additive regulation is. A single company petitioned for a single ingredient; the FDA evaluated it against prior exposure estimates and an equivalent approved source, then published an order that applies industry-wide [s1]. The order took effect on publication, but it is not the last word: the FDA set a deadline of 26 October 2026 for interested parties to file objections and request a hearing [s1].

What to watch

Whether any objections are filed before the October deadline; whether manufacturers actually adopt yeast-derived vitamin D2 in reformulated cereals, pasta or dairy; and whether the FDA receives further petitions to extend the same source into additional food categories. For now, the change is narrow and technical — a new, capped source of a familiar added nutrient, cleared at limits the agency had already judged safe [s1][s2].