Nicotinamide Riboside vs NRH
Written by Aaron CuhaReviewed Sep 2026
The short answer
The reduced form raises NAD in cells by 2.5 to 10 fold within an hour, more than NR or NMN at the same strength. It has never been given to a person in a published trial, and it is already sold to shoppers. That is the comparison.
- Nicotinamide Riboside people
- 90
- Nicotinamide Riboside nulls
- 1
- NRH people
- 65
- NRH nulls
- 0
Dose
No human dose established
Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.
4 completed trials, 90 people given it
Dose
No human dose established
Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.
1 completed trial, 65 people given it
First-hand reports are counted on each profile and never added together. This page sets two published records side by side. It does not pick a winner.
Column A
Nicotinamide RibosideNicotinamide Riboside (NR)
A form of vitamin B3 that reliably raises NAD in people. That part is proven. A big mouse program found it did not help mice live longer.
Column B
NRHDihydronicotinamide riboside, the reduced form of nicotinamide riboside
In cells grown in a dish, NRH raised NAD 2.5 to 10-fold within an hour, more than NR or NMN at the same amount. It also reaches body tissues in mice. It has never been given to a person in a published study, and it is already sold to consumers.
Side by side, on the facts we can check
| What we compare | Nicotinamide Riboside | NRH |
|---|---|---|
| Category | Longevity | Longevity |
| FDA status | Sold as a supplement; not an approved drug | Not an approved drug, and not a recognised supplement ingredient in the United States. Research-chemical and supplement sellers sell it with no published human safety data. The FDA has not reviewed it. |
| Half-life | Short | No human pharmacokinetic study has been published, so no half-life in people can be stated. The mouse work used intraperitoneal injection and oral gavage and reported tissue NAD rather than compound clearance. |
| Molecular weight | 255.2 Da | About 256 Da for the reduced free base, against 255 Da for the nicotinamide riboside cation. |
| How it works | The body turns NR into NAD through a recycling route. That tops up the NAD that falls with age. NAD feeds the parts of cells that make energy and do repairs. | Inside cells, an energy-using enzyme turns NRH into NMNH. That step does not need NRK1 or NRK2. Other enzymes then turn NMNH into NADH, which joins the NAD pool. Skipping the NRK step is the likely reason NRH beats NR, because NRK1 is the slow step for NR. Because it comes in as the reduced form, it also shifts the balance between NAD and NADH differently from NR and NMN. That is the least understood part of how it works, and the part that matters most for whether it is safe. |
| Studies in people | 5 | 1 |
| Evidence | Limited: 4 completed trials, 90 people given it | Limited: 1 completed trial, 65 people given it |
| Legal status, US | Sold as a dietary supplement | Not approved; research use only |
Frequently asked questions
What is the difference between Nicotinamide Riboside and NRH?
Nicotinamide Riboside: A form of vitamin B3 that reliably raises NAD in people. That part is proven. A big mouse program found it did not help mice live longer. NRH: In cells grown in a dish, NRH raised NAD 2.5 to 10-fold within an hour, more than NR or NMN at the same amount. It also reaches body tissues in mice. It has never been given to a person in a published study, and it is already sold to consumers.
Which has stronger research evidence, Nicotinamide Riboside or NRH?
Each compound gets a band worked out from facts we counted, with the math shown. Nicotinamide Riboside is Limited (4 completed trials, 90 people given it). NRH is Limited (1 completed trial, 65 people given it). That counts how much has been done in people. It does not rate whether either one works, and neither one is called the winner.
Are Nicotinamide Riboside and NRH FDA-approved?
Nicotinamide Riboside: Sold as a supplement; not an approved drug. NRH: Not an approved drug, and not a recognised supplement ingredient in the United States. Research-chemical and supplement sellers sell it with no published human safety data. The FDA has not reviewed it..
Related posts
Blog articles that cover Nicotinamide Riboside or NRH, newest first.
Reviewed Sep 2026. This page puts two published records side by side. It is for learning, and it is not medical advice. When this site shows a dose, it is the dose a trial or a clinic actually used, or what people say they did, with the source attached. None of it tells you what to take.