GenuinePurity NMN-H uses reduced NMN (NMNH), a newer NAD+ precursor. We review the mainly lab and animal evidence, the unverified dose, the guarantee and the safety unknowns.
We don't know yet. NMN-H (reduced NMN, or NMNH) is a newer NAD+ precursor with mainly cell and mouse evidence; we found no peer-reviewed human trial. Claims that it is more stable or better absorbed than standard NMN haven't been shown in people, and we couldn't verify the dose per serving. If you want an NAD+ product with human data, standard NMN has more evidence.
NMNH is the reduced form of nicotinamide mononucleotide (NMN). Like NMN, it is a building block the body can use to make NAD+, a molecule involved in energy metabolism and cell repair. Cell and mouse studies suggest NMNH raises NAD+ more strongly than NMN, but human evidence for standard NMN does not automatically apply to NMNH.
The only human study we found is a trial registered by ingredient maker Effepharm for its UthPeak NMNH. Its claimed results appear only in sponsor marketing, not in a peer-reviewed journal, and we could not confirm which NMNH supplier GenuinePurity uses. Claims that NMN-H is "more stable" or "more bioavailable" have not been shown in people.
We could not read an official Supplement Facts panel: one source implies 250 mg per capsule and a 2-capsule (500 mg) serving, another lists 1 capsule a day, so check the label. The guarantee runs 97 days from delivery, with conditions (returns must arrive within 97 days; shipping isn't refunded). As a newer compound, NMNH has even less human safety data than NMN: avoid it if you are pregnant, breastfeeding, under 18, or have cancer or a history of it unless your oncologist agrees, and ask your doctor if you take diabetes or blood pressure medicines.
Our top pick among NMN supplements is standard GenuinePurity NMN, because NMN has small human trials behind it.