How to read a new dietary ingredient notification

Dietary supplements never go through the approval process a drug or device does, and a new dietary ingredient (NDI) notification is often the clearest evidence of that fact — because the word “approval” never appears anywhere in it. The Dietary Supplement Health and Education Act of 1994 (DSHEA) set up a notification system instead, and reading an NDI notification correctly starts with understanding exactly what kind of filing it is, and what FDA does and doesn’t do with it.

Why there’s no approval to look for

Dietary supplements are regulated as a category of food, not as drugs, which is the root of everything else about how an NDI notification reads differently from an FDA drug approval letter. Instead of premarket approval, Congress built a notify-and-wait system: the firm assembles and certifies its own safety evidence, FDA has a fixed window to object, and absent an objection the product can move forward. An NDI notification is an argument a manufacturer is making to itself and to FDA, not a decision FDA has rendered — reading one means reading that argument on its own terms, not looking for an approval that the statute never asked FDA to issue.

What the 75-day window actually does

FDA acknowledges receipt and logs the filing date, and that date starts the clock. For 75 days, the firm can’t introduce the product into interstate commerce. FDA can send an objection letter at any point in the window identifying why the submitted evidence doesn’t support the ingredient’s safety at the labeled conditions of use; if it does, the firm either addresses the objection and resubmits, or doesn’t move forward with that ingredient as submitted. If the 75 days pass without an objection, the firm may proceed — but an unobjected-to file sitting in FDA’s queue isn’t an endorsement, just the end of a filing period that FDA wasn’t required to act on affirmatively.

What the grandfather date is actually doing

Not every supplement ingredient needs an NDI notification at all. An ingredient already present in the food supply, as an article used for food in a form that wasn’t chemically altered, before October 15, 1994 doesn’t count as “new” regardless of how unfamiliar it sounds to a given reader. The real judgment call in many filings sits there — whether an ingredient genuinely predates that line, and whether whatever processing it has undergone counts as a chemical alteration — more than in the safety evidence itself. Reading the statute’s own definition closely, the discipline reading a regulation rather than just the guidance built on it rewards generally, matters more here than almost anywhere else in food and drug law, because the entire notification requirement turns on whether a given ingredient fits inside that definition.

The notify-and-wait structure is unusual enough among FDA-regulated product categories that it’s worth reading against something more familiar before trusting your intuition about it. How to read an FDA guidance document is a useful companion here, if only because it’s a reminder of how much of food and drug law runs on documents that aren’t approvals, decisions, or clearances at all.