What is a new dietary ingredient and who checks it?

A new dietary ingredient (NDI) is a vitamin, mineral, herb, amino acid or similar ingredient that was not sold in the United States as a supplement before October 15, 1994. The company that wants to sell it has to send FDA a notification with its safety reasoning at least 75 days before launch. FDA reviews that filing, but it does not approve the ingredient or the product.

That last point surprises many shoppers. This guide explains who checks what, what an NDI notification does and does not tell you, and what you can actually verify from the couch. It is general information, not medical advice.

What counts as a new dietary ingredient?

FDA's consumer Q&A on supplements starts with the definition of a "dietary ingredient" in the Dietary Supplement Health and Education Act of 1994 (DSHEA). It must be one of these: a vitamin, a mineral, an herb or other botanical, an amino acid, a dietary substance used to supplement the diet by increasing total dietary intake, or a concentrate, metabolite, constituent, extract or combination of any of those.

A "new" dietary ingredient is one that fits that definition and was not marketed in the United States before October 15, 1994. So "new" is a legal date, not a measure of how novel the ingredient sounds. A plant extract that has been in capsules for thirty years is not an NDI. A newly engineered extract, a new compound, or an old herb prepared in a way nobody sold before might be.

Who checks a new dietary ingredient before it is sold?

Mostly, the company itself. FDA says that under DSHEA it cannot approve dietary supplements before they are marketed, and that manufacturers and distributors have the initial responsibility for making sure their products meet the safety standards. FDA is, in its own words, generally limited to postmarket enforcement: it can act after a problem product reaches shelves.

Ordinary supplements do not need to send FDA their safety evidence before or after launch. The NDI notification is the exception. FDA's Q&A says a manufacturer or distributor of a supplement containing a new dietary ingredient must notify FDA at least 75 days before putting it into interstate commerce, unless the ingredient is already present in the food supply as an article used for food in a form that has not been chemically altered.

A 2017 review of dietary supplement regulation in the journal Drug Testing and Analysis describes the same design: DSHEA required manufacturers to give FDA information supporting a conclusion that an ingredient is reasonably expected to be safe if it was not marketed in the USA before October 15, 1994. Later amendments added mandatory reporting of serious adverse events and gave FDA mandatory recall authority.

The notification has to include the information on which the firm concluded that the product "will reasonably be expected to be safe" under the conditions of use suggested in the labeling. In plain terms: the company writes down why it thinks the ingredient is safe, and FDA gets to read it before the product ships.

What does an NDI notification mean, and what does it not mean?

It means the company filed a safety argument with the agency. It does not mean FDA certified the ingredient. FDA's consumer page "FDA 101: Dietary Supplements" is blunt: the agency does not have the authority to approve dietary supplements for safety and effectiveness, or to approve their labeling, before they are sold.

FDA's own ingredient directory repeats the reminder that FDA does not approve dietary supplements for safety and effectiveness, and notes that the directory is not a complete list of every ingredient used. It also points readers to a separate FDA list of submitted 75-day premarket notifications for new dietary ingredients, which is where the ingredient-level filings are posted.

A notification also says nothing about whether an ingredient does anything for you. The safety filing is about whether the ingredient is reasonably expected to be safe as labeled. Whether a sales page claim is supported is a separate question, handled by different rules (see our guide to how we review supplement offers).

Which ingredients skip the notification?

Three situations come up most often.

• Old ingredients. If an ingredient was marketed in the United States before October 15, 1994, it is not "new," so no NDI notification applies. FDA held a public meeting on October 3, 2017 about developing a list of pre-DSHEA dietary ingredients, which shows how hard it can be to prove what was on the market that long ago.
• Ingredients already in the food supply. The notification requirement has an exception for an ingredient present in the food supply as an article used for food, in a form that has not been chemically altered.
• Ingredients that are not dietary ingredients at all. FDA's Q&A notes that the dietary supplement definition generally excludes substances approved as new drugs or licensed as biologics, unless they were previously marketed as a supplement or food.

The practical result is that the NDI pathway covers only a slice of what is sold. Most supplement ingredients on a shelf never needed a notification.

What can a shopper actually check?

Less than you would hope. A label will not tell you whether the ingredient needed an NDI notification, and a seller who says an ingredient is "FDA-approved" is describing something FDA says it cannot do. Our Nerve Fresh review, for example, flags the sales page's "FDA-approved facility" wording as a claim to treat with caution.

What you can check is whether the label lets you identify the ingredients at all. If you cannot read what is in the capsule, you cannot ask whether any of it is new, unusual, or safe at the dose. Two offers we reviewed show the problem. The HP9 Guard review found no ingredient names, no doses and no supplement facts panel on the sales page, the FAQ or the policy pages. The KundaliniFlow review found no ingredient names or amounts anywhere on the sales page, checkout or terms page.

Partial disclosure creates a smaller version of the same gap. The Pineal 10X review lists eight ingredients with no stated amount, including iodine, and notes that iodine has a real and fairly narrow safe intake range. The NervoLink review found that five of its nine ingredients sit inside an undisclosed proprietary blend. None of this says these products contain a new dietary ingredient. It says a reader cannot tell, and that is the point.

This is also why our reviews score transparency separately: a label that names every ingredient and its amount gives you something concrete to look up. Browse the full list of reviews to see how different offers compare.

A short checklist before you buy an unfamiliar ingredient

1. Find the Supplement Facts panel or "View label" link. If there is none, treat the offer as unverifiable.
2. Write down each ingredient's exact name, including the plant part or compound form.
3. Search the name on FDA's ingredient directory and on PubMed. A long human research record suggests an ingredient has been around; a blank result for an odd name is a reason to ask questions.
4. Ask the seller in writing whether the ingredient is the subject of an NDI notification, and whether the formula has changed since launch. A vague answer is itself an answer.
5. Check whether the sales page says "FDA-approved" about the product or ingredient. FDA says it does not approve supplements.
6. Talk to your doctor or pharmacist before starting anything unfamiliar, especially if you take prescription medicines.
7. If you have a bad reaction, stop the product and report it to FDA through the Safety Reporting Portal that FDA's Q&A describes.

FAQ

Does FDA approve new dietary ingredients?

No. FDA reviews an NDI notification, but the law gives it no authority to approve a dietary supplement or its ingredients for safety and effectiveness before sale. The company is responsible for the safety conclusion it files.

How long before launch must the notification be sent?

At least 75 days before the product is introduced into interstate commerce, according to FDA's Q&A on dietary supplements.

Is every ingredient with a strange name an NDI?

No. "New" means not marketed in the United States before October 15, 1994. An unfamiliar name can be an old ingredient under a trade name, and an ingredient that sounds ordinary can still be an NDI if it was prepared in a way that was not previously sold. The label cannot settle it.

Can a supplement be sold without FDA ever seeing its safety evidence?

For most ingredients, yes. FDA's Q&A says a firm generally does not have to give FDA the evidence it relies on to substantiate safety, with the NDI notification as the main exception. FDA adds that the manufacturer must still follow current good manufacturing practices and must forward serious adverse event reports it receives.

If you want to see how these rules play out on real sales pages, start with our ClickBank refund guide, then browse the energy and wellness category, where several of the reviews above sit.