GRAS vs NDI: the two ingredient pathways for US supplements

There are two main ways a new ingredient can lawfully enter a US supplement, and confusing them is a costly mistake. One is the NDI notification; the other is the GRAS route. They overlap, they are debated, and which one applies shapes how — and whether — you can use an ingredient. Here is how the two pathways differ.

The two pathways

For an ingredient that is new to the US market, a manufacturer is generally looking at one of two justifications for using it lawfully: that the ingredient is the subject of an NDI notification (or is otherwise grandfathered), or that its use is Generally Recognized As Safe (GRAS) for the relevant conditions of use.

These are not the same thing, and they come from different parts of food law — but in practice they are the two doors through which a new ingredient walks into a product.

What GRAS means

GRAS — Generally Recognized As Safe — is a food-law concept: a substance whose use is recognised, by qualified experts, as safe under the conditions of its intended use, based on scientific evidence (or, for older substances, a long history of use). A GRAS substance does not need the same pre-market treatment as a food additive.

An important wrinkle is that GRAS status can be self-determined: a company can conclude, with appropriate expert support, that an ingredient is GRAS, with or without notifying the FDA. This self-affirmed GRAS route is both widely used and the subject of ongoing debate.

How GRAS and NDI interact

The relationship between the two is where it gets subtle. An ingredient that is a lawfully used food ingredient — including one that is GRAS for use in food — may not need an NDI notification to be used in a supplement, depending on the circumstances. Conversely, a genuinely new ingredient with no food status may need the NDI route.

The analysis depends on the ingredient, its history, its intended use, and how it is made. The two pathways are connected, and the right one is not always obvious — which is exactly why the question deserves careful attention before formulating.

Why this is contested right now

Both routes are part of the current debate about modernising US supplement and food-ingredient regulation. There is discussion about GRAS reform — particularly around self-affirmed GRAS and transparency — and about how the NDI process should work for modern ingredients. The boundaries between the pathways, and the expectations around each, are actively being examined.

Because GRAS and NDI policy are both under active review, confirm the current FDA position for your specific ingredient and intended use rather than relying on a general summary.

The common thread: characterise the ingredient

Whichever pathway applies, the foundation is the same: you have to know exactly what the ingredient is, where it comes from, how it is made, its history of use, and its intended use and level. That characterisation is what an NDI notification needs, what a GRAS conclusion rests on, and what tells you which route you are even on.

An ingredient that is well characterised — identity, source, process, use level — is one whose regulatory pathway can be analysed. A vaguely specified ingredient is a pathway question waiting to become a problem.

Building it into the ingredient record

The practical approach is to hold this characterisation as part of the ingredient's record in the formula: what it is, its status, its history, its conditions of use. When that travels with the ingredient, the question of which pathway applies — and whether an ingredient is cleared for use — can be assessed as it is added, rather than reconstructed later.

The takeaway

GRAS and NDI are the two main pathways for using a new ingredient in a US supplement, connected but distinct, and both are under active regulatory review. Determining which applies depends on a precise characterisation of the ingredient — identity, source, process, history, and use. Holding that characterisation with the ingredient is what makes the pathway analysable instead of a late surprise.

Lemoniq holds each ingredient's identity, source, and status as part of the formula, so the characterisation behind a GRAS or NDI analysis is in one place and a pathway question surfaces as you formulate. We solve this exact problem. See how it works