Nicotinamide Riboside (NR)
NR · Niagen · Tru Niagen · Basis
Nicotinamide Riboside (NR) is a vitamin B3 derivative and direct precursor to nicotinamide adenine dinucleotide (NAD+), the central electron-carrier molecule in cellular metabolism. NR is found in trace amounts in cow's milk and produced commercially as nicotinamide riboside chloride (Niagen, the most-studied form). NAD+ levels decline measurably with age (50% reduction by age 60 in many tissues), driving multiple age-related dysfunctions; NR supplementation reliably elevates NAD+ in human blood and tissues, making it one of the most-studied longevity interventions.
Take with breakfast or lunch. Most clinical trials use 300-1000mg/day. Pairs well with TMG (250-500mg) to support methylation balance, since NAD+ metabolism consumes methyl groups.
Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.
How it works
NR is converted to NAD+ via a 2-step enzymatic pathway: nicotinamide riboside kinases (NRK1, NRK2) phosphorylate NR to NMN (nicotinamide mononucleotide), and nicotinamide mononucleotide adenylyltransferases (NMNATs) then convert NMN to NAD+. This bypasses the rate-limiting NAMPT step required for nicotinamide salvage, making NR a more direct route to NAD+ than nicotinamide. The NRK enzymes are expressed across nearly all human tissues, supporting broad tissue NAD+ elevation.
Elevated NAD+ supports the function of three major NAD-consuming enzyme families: sirtuins (SIRT1-7, NAD-dependent deacetylases regulating gene expression, mitochondrial function, and metabolism), PARPs (poly-ADP-ribose polymerases for DNA repair), and CD38 (NADase). With age, CD38 activity rises (driven by inflammation), accelerating NAD+ consumption; NR supplementation partially compensates by replenishing the substrate pool.
Downstream effects include mitochondrial biogenesis via PGC-1alpha activation, improved mitochondrial respiratory efficiency, enhanced fatty acid oxidation, reduced oxidative stress, and improved endothelial function. In older adults, NR supplementation has shown reduced systolic blood pressure (-10mmHg in stage 1 hypertension subgroup), improved muscle mitochondrial function, and modest improvements in inflammatory markers (IL-6, TNF-alpha).
What to expect
Days 1-14: NAD+ levels rise. Some users notice energy / clarity early; many no subjective change.
Evidence
Claims we could not support
No abstract we checked supports these for this molecule at this route. That is not the same as saying they are false — it marks where the evidence is missing.
Dose/route: 300mg; Oral; Daily. No checked live PubMed abstract verified this exact displayed dose, route, and frequency for the same molecule/formulation and relevant population.
Mechanism: NR is converted to NAD+ via a 2-step enzymatic pathway: nicotinamide riboside kinases (NRK1, NRK2) phosphorylate NR to NMN (nicotinamide mononucleotide), and nicotinamide mononucleotide adenylyltransferases (NMNATs) then convert NMN to NAD+. This bypasses the rate-limiting NAMPT step required for nicotinamide salvage, making NR a more direct route to NAD+ than nicotinamide. The NRK enzymes are expressed across nearly all human tissues, supporting broad tissue NAD+ elevation.. No checked live PubMed abstract provided an exact-molecule/formulation sentence supporting this source-JSON mechanism claim.
Primary safety claim: Mild GI effects (nausea, bloating) at higher doses (>500mg) - take with food to reduce. No checked live PubMed abstract directly verified this source-JSON safety claim at the displayed formulation, route, and regimen.
Interactions & stacking
Two different questions: what is documented about running these together, and what is documented about drawing them into the same syringe. A good pharmacological partner can still have to be pinned separately.
Documented together
Keep separate
Check any specific pair in the Stack & Interaction Checker, which answers both questions separately. Absence of a documented conflict is not evidence of safety.
Pharmacokinetics
NAD+ in blood, with daily dosing maintains plateau
Oral
NAD+ pool turnover
High oral bioavailability via NRK enzymes - NR rapidly converted to NAD+ in liver, blood, and tissues.
NAD+ elevation sustained with daily dosing. Skipping doses results in gradual NAD+ decline over 2-3 days back to baseline.
Hepatic and tissue conversion to NAD+, then standard NAD+ catabolism (sirtuin/PARP/CD38 consumption, recycling via NAMPT salvage pathway).
Storage. Store at room temperature (20-25C) in a cool, dry place. Niagen capsules are shelf-stable for 18-24 months. Powder form may degrade faster - keep sealed and dry. Refrigeration extends shelf life but not required.
Regulatory status
Classified as a dietary supplement in the US (FDA NDIN status as of 2016 for ChromaDex's Niagen). GRAS (Generally Recognized as Safe) self-affirmed. Available over the counter. EU Novel Food authorization granted 2017. Major commercial brands include Tru Niagen (ChromaDex/Niagen) and Basis (Elysium, NR + pterostilbene).
Put it to work
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The guide & community
The complete Nicotinamide Riboside (NR) walkthrough, real protocol discussion and coaching live inside the BlessUp community on Skool.
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