Introduction
At the earliest stages of market entry, ingredient manufacturers targeting the U.S. market invariably encounter a pivotal regulatory hurdle:
Should we pursue GRAS (Generally Recognized as Safe), or file an NDI (New Dietary Ingredient) notification?
Although these two pathways both fall under U.S. FDA oversight and both focus on ingredient safety, they serve very different regulatory purposes. Choosing the wrong one can mean wasted time, unnecessary cost, and delayed market entry.
Below is a practical guide for GRAS vs. NDI, covering the common ways and differences between GRAS and NDI, and how to decide which path aligns with your product strategy.
What Is GRAS (Generally Recognized as Safe)?
GRAS originates from the 1958 Food Additives Amendment to the U.S. Federal Food, Drug, and Cosmetic Act. Under U.S. law, a substance may be considered GRAS if:
Its safety is generally recognized by qualified experts, based on scientific procedures, or
It was widely consumed in food prior to 1958 and has a documented history of safe use.
The key concept here is “general recognition.” The safety conclusion must be supported by publicly available data and be broadly acceptable within the scientific community.
Importantly, GRAS status applies to ingredients used in conventional foods and beverages, and a GRAS substance that already applied in the food industry can be extrapolated for use in dietary supplements.
What Is NDI (New Dietary Ingredient)?
NDI was established under the 1994 Dietary Supplement Health and Education Act (DSHEA), a landmark law that created a distinct regulatory category for dietary supplements in the U.S.
An NDI is a dietary ingredient that was not marketed in the United States before October 15, 1994.
Under DSHEA, “dietary ingredients” include:
Vitamins
Minerals
Herbs or botanicals
Amino acids
Dietary substances used to supplement the diet
Concentrates, extracts, metabolites, or combinations of the above
Two critical thresholds define NDI:
“New” is strictly date-based.
If FDA determines the ingredient was already legally marketed before 1994, the agency may reject the notification as unnecessary.It must be legally qualified as a dietary ingredient.
FDA first evaluates whether the substance meets the statutory definition. If not, the notification will not proceed.
NDI applies only to dietary supplements, not conventional foods.
NDIN: New Dietary Ingredient Notification
A notification (NDIN) must be submitted 75 days before marketing if:
The ingredient was not marketed in the U.S. before October 15, 1994.
And it has not been present in the food supply as an article used for food in a form in which the food has not been chemically altered.
GRAS vs. NDIN: Key Regulatory Differences
| Category | GRAS (Generally Recognized as Safe) | NDIN (New Dietary Ingredient Notification) | Notes |
| Scope of Application | Broad. Applicable to conventional foods, beverages, functional foods, and may also be used for dietary supplements. | Narrow. Applicable only to dietary supplements (e.g., capsules, tablets, powders, softgels). | If your commercial strategy includes foods or beverages, GRAS is the only viable regulatory pathway. |
| Nature of Safety Data | Publicly available. Safety evidence must be published or otherwise accessible to the scientific community and capable of achieving general expert consensus. | Proprietary data permitted. Safety evidence may rely on company-owned, unpublished studies and does not need to be publicly available. | NDIN can help establish technical barriers and protect proprietary R&D investments. |
| Regulatory Outcome | Following FDA review of a voluntary GRAS notification, the agency may issue a “no questions” letter, indicating at this time it has no objections to the notifier’s GRAS conclusion. | FDA conducts a 75-day review after receiving the NDIN. If no objections are raised within that period, the ingredient may be legally marketed, and FDA typically issues an acknowledgment letter. | An NDIN acknowledgment letter does not constitute FDA approval or endorsement of safety. It simply indicates that FDA has not identified immediate safety concerns. FDA retains authority to take action if new safety data emerge. |
| Likelihood of Success | Self-affirmed GRAS does not require mandatory FDA review, which generally results in faster process and a higher practical success rate when supported by strong data. | Increasingly stringent review standards. Objection rates remain high, and deficiencies in data or reasoning frequently result in negative responses. | GRAS generally offers greater regulatory predictability and is often better suited for ingredients targeting broad food and beverage markets. NDIN carries a higher evidentiary burden and lower overall success rates. |
Why Do Both Pathways Exist?
Understanding the historical origins clarifies everything.
GRAS emerged from food law reform in 1958. Its purpose was to exempt widely accepted, safe substances (like salt or baking soda) from the lengthy food additive approval process. It reflects a framework built around conventional foods.
NDI, created in 1994, responded to rapid growth in the supplement industry. Congress sought to balance innovation with consumer safety by requiring advance notification for newly introduced dietary ingredients.
What Do GRAS and NDI Have in Common?
Despite distinct legal frameworks, GRAS and NDI share three core principles:
Same Ultimate Goal: Demonstrate Safety
Both pathways require robust scientific evidence showing that the ingredient is safe under its intended conditions of use.
Same Regulator
Both fall under the authority of the U.S. Food and Drug Administration (FDA) and must comply with applicable sections of the Code of Federal Regulations (CFR).
Science-driven Evaluation
Both typically require:
Identity and composition data
Manufacturing process information
Specifications and impurity analysis
Stability data
Estimated dietary exposure
Toxicological studies (as needed)
A well-structured safety narrative is essential in either case.
How Should Companies Decide When Choose Between GRAS and NDI?
If your goal is broad use in foods or beverages, GRAS is typically the more suitable and efficient route.
If your focus is dietary supplements and the ingredient qualifies as “new,” NDI notification may be required—and demands careful preparation.
REACH24H recommends that companies carefully evaluate their target market, product positioning, and technical characteristics before determining a regulatory pathway. Consulting with experienced regulatory professionals can help identify the most appropriate submission strategy, avoid unnecessary detours, and prevent delays in product launch timelines.
For more information or assistance, please feel free to contact our experts at customer@reach24h.com.
