Legal status · United States
Is NRH legal in the United States?
Written by Aaron CuhaReviewed Sep 2026
Direct answer
No. NRH is not an approved medicine in the United States; its classification is "Not approved; research use only". Nothing containing it is authorized for any use in people. Vials labeled "for research use only" are not exempt: that label does not make human use lawful. On the evidence, 1 human study is cited on its profile.
NRH in the United States at a glance
| Classification | Not approved; research use only |
|---|---|
| Note | Sold online as a supplement or research chemical despite no published human trial of any kind. No New Dietary Ingredient notification is publicly associated with it. |
| FDA approval status | Not an approved drug and not an established dietary ingredient in the United States. It is sold by research-chemical and supplement vendors without any published human safety data. FDA has not evaluated it. |
| Human studies cited | 1 of 4 citations on the profile |
| Reviewed | Sep 2026 |
Classification and note come from the NRH profile, checked against U.S. Food and Drug Administration (FDA) listings at the reviewed date.
What this means
- 01
No product containing NRH is approved by FDA for any use in the United States, so nothing on the market is authorized for people.
- 02
"Research use only" is a vendor label, not a legal category that permits human use. It does not exempt a product from medicines law.
- 03
Importing, supplying or promoting it for human use can fall under medicines legislation in the United States. This page is general information, not legal advice.
What NRH is
Raises cellular NAD by 2.5 to 10-fold within an hour in cultured mammalian cells, more than NR or NMN at equivalent concentrations, and reaches tissues in mice. It has never been given to a human being in a published trial, and it is already sold to consumers.
NRH is the reduced form of nicotinamide riboside, and it is the most potent NAD-raising molecule in this batch by a wide margin. Every number supporting that statement comes from cultured cells or from mice.
Mechanism: NRH is converted to NMNH by an ATP-dependent kinase activity found in cell lysates that is independent of NRK1 and NRK2, and NMNH is then adenylylated by NMNAT enzymes to NADH, which enters the NAD pool. Bypassing the NRK step is the proposed reason NRH outperforms NR, since NRK1 expression is rate-limiting for NR utilisation and is not required here.
Regulatory history: Not an approved drug and not an established dietary ingredient in the United States. It is sold by research-chemical and supplement vendors without any published human safety data. FDA has not evaluated it.
How FDA treats this kind of product
Approves prescription drugs by indication and polices unapproved products, including peptides sold online. Compounding pharmacies may prepare some compounds under a prescription when the FDA places them on a permitted bulk-substances category.
The classification above is the The Longevity Archive reading of U.S. Food and Drug Administration listings for NRH at the reviewed date, not a legal opinion. Rules change, and importing, prescribing and possessing a compound can each be treated differently. Check the regulator directly before acting on anything here.
NRH in other countries
Frequently asked questions
Is NRH legal in the United States?
No. NRH is not an approved medicine in the United States; its classification is "Not approved; research use only". Nothing containing it is authorized for any use in people. Vials labeled "for research use only" are not exempt: that label does not make human use lawful. On the evidence, 1 human study is cited on its profile. Note: Sold online as a supplement or research chemical despite no published human trial of any kind. No New Dietary Ingredient notification is publicly associated with it.
Can I buy NRH in the United States?
No approved product exists to buy. In the United States NRH is classified as "Not approved; research use only", so there is no licensed pharmacy product. Vendors selling it "for research use only" are not selling it for human use, and that label does not change its legal status. This site does not list or recommend vendors. Note: Sold online as a supplement or research chemical despite no published human trial of any kind. No New Dietary Ingredient notification is publicly associated with it.
Is NRH FDA approved?
No. FDA status: Not an approved drug and not an established dietary ingredient in the United States. It is sold by research-chemical and supplement vendors without any published human safety data. FDA has not evaluated it.. Current US classification: "Not approved; research use only". On the evidence, 1 human study is cited on its profile.
Related compounds in the United States
Full research profile
Mechanism, cited studies, FDA status and the full legal summary for NRH live on its compound profile.
NRH profileThis page is general information about the regulatory status of NRH in the United States, current as of Sep 2026. It is not legal advice, and classifications change; check U.S. Food and Drug Administration directly or consult a lawyer for a specific situation. Educational use only. This database summarizes published research. It is not medical advice and contains no dosing protocols or recommendations for personal use. The Longevity Archive has no vendor relationships and does not recommend where to buy anything.