Mechanism of Action
Nicotinamide riboside is absorbed in the intestine and transported into cells through specific membrane carriers. Inside the cell, an enzyme (nicotinamide riboside kinase) converts it into NMN (nicotinamide mononucleotide), then into NAD+.
The newly formed NAD+ takes part in two major families of reactions. It acts as an electron shuttle in the redox reactions that produce cellular energy. It is also consumed as a substrate by sirtuins (enzymes that regulate gene expression and DNA repair) and by PARPs (DNA repair enzymes activated in response to damage).
This dual demand creates a biological tension. As cellular damage accumulates with age, more NAD+ is consumed for repair, leaving less available for energy production. Nicotinamide riboside aims to replenish this NAD+ pool through oral supplementation.
Key Benefits
- Strong
Multiple randomized controlled trials have evaluated oral NR supplementation at doses of 300 to 1,000 mg per day. They show a significant, dose-dependent increase in NAD+ levels in blood and tissues.
- Strong
Niacin contributes to normal energy-yielding metabolism. As a form of vitamin B3, NR supports the cellular reactions that convert nutrients into energy.
- Strong
Niacin contributes to the reduction of tiredness and fatigue. Clinical trials show that NR raises NAD+ levels in skeletal muscle, a tissue highly reliant on energy metabolism.
- Strong
Niacin contributes to normal functioning of the nervous system. The brain consumes roughly 20% of total body energy and relies on NAD+ for its ATP production.
- Strong
Niacin contributes to the maintenance of normal skin. NAD+ is involved in skin cell renewal processes.
- Moderate
A controlled trial in older men evaluated 21 days of NR supplementation at 1 g per day. Results show a reduction in circulating inflammatory markers and anti-inflammatory signatures in the muscle transcriptome.
- Emerging
Preliminary data in overweight adults suggest favourable changes in body composition after six weeks of NR supplementation. These findings require confirmation in larger-scale trials.
Dosage & Forms
Three NAD+ precursors are available for oral supplementation. Nicotinic acid causes vasomotor flushing from 50 mg onward, limiting its use at higher doses. Nicotinamide inhibits sirtuins at high concentrations, a counterproductive effect when the goal is to support their activity.
Nicotinamide riboside avoids both drawbacks. Human pharmacokinetic studies show a dose-dependent increase in blood NAD+ between 100 and 1,000 mg per day, without flushing or sirtuin inhibition. NMN (nicotinamide mononucleotide) is another promising precursor, but its human pharmacokinetic data remains less extensive at this stage.
Singular selects nicotinamide riboside chloride at calibrated doses of 100, 200, or 300 mg based on individual profile. This range corresponds to the dosages used in major clinical trials.
In the Singular Formula
Inclusion rationale
Form of vitamin B3 identified in milk and certain foods. Nicotinamide riboside is a direct precursor of NAD+ (nicotinamide adenine dinucleotide) via the nucleotide salvage pathway. NAD+ is a coenzyme present in every living cell, involved in hundreds of metabolic reactions. It plays a dual fundamental role: coenzyme in energy metabolism (glycolysis, Krebs cycle, mitochondrial respiratory chain) and substrate consumed by DNA repair and cellular maintenance enzymes. NAD+ levels decline by 40 to 60% between ages 40 and 60, a decline correlated with many aspects of biological aging. NR is the NAD+ precursor form with the best characterized human pharmacokinetics: clinical trials confirm a biochemical elevation of blood and tissue NAD+. Long-term functional benefits are the subject of ongoing studies in larger populations. In the formula, NR pairs with PQQ (also present), which supports mitochondrial renewal. These two compounds act complementarily: NR fuels energy production via NAD+, while PQQ promotes the genesis of new mitochondria.
Selected form
Nicotinamide riboside chloride, a stabilised form of vitamin B3 naturally found in milk. Direct precursor to NAD+ (nicotinamide adenine dinucleotide), an essential coenzyme present in every cell and involved in energy metabolism. Unlike conventional nicotinamide or nicotinic acid, nicotinamide riboside uses the nucleotide salvage pathway, a more direct metabolic route to NAD+. The chloride form ensures optimal stability at ambient temperature. Quality: non-GMO.
Formula dosage
0 to 300 mg.
Synergies in the formula
Safety & Precautions
Nicotinamide riboside is generally well tolerated in published clinical trials. The Conze et al. (2019) trial involving 140 adults assessed doses of 100 to 1,000 mg per day for 8 weeks with no serious adverse events reported.
Reported side effects are minor and transient: mild nausea, passing warmth sensation, pruritus. These manifestations are rare and resolve within a few days.
Individuals on medication, pregnant or breastfeeding women, and children should consult a healthcare professional before supplementation. NR is not recommended in combination with immunosuppressive drugs without prior medical advice.
Nicotinamide riboside chloride is authorised as a Novel Food in the European Union. The track record of human supplementation remains limited to roughly a decade of clinical studies.
Scientific Studies
| Authors | Year | Type | Journal | |
|---|---|---|---|---|
| Martens CR et al. | 2018 | Randomised Controlled Trial | Nature Communications | View on PubMed |
Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults Randomized trial in 24 healthy adults aged 55 to 79 showing that 1 g/day of NR for 6 weeks is well tolerated and increases NAD+ levels by 60% compared to placebo. | ||||
| Elhassan YS et al. | 2019 | Randomised Controlled Trial | Cell Reports | View on PubMed |
Nicotinamide Riboside Augments the Aged Human Skeletal Muscle NAD+ Metabolome and Induces Transcriptomic and Anti-inflammatory Signatures Controlled trial in 12 older men showing that 1 g/day of NR for 21 days augments the muscle NAD+ metabolome and induces anti-inflammatory transcriptomic signatures. | ||||
| Conze D et al. | 2019 | Randomised Controlled Trial | Scientific Reports | View on PubMed |
Safety and Metabolism of Long-term Administration of NIAGEN (Nicotinamide Riboside Chloride) in a Randomized, Double-Blind, Placebo-controlled Clinical Trial of Healthy Overweight Adults Double-blind randomized trial in 140 overweight adults confirming the safety of NR at doses of 100 to 1,000 mg/day for 8 weeks. | ||||
| Dollerup OL et al. | 2018 | Randomised Controlled Trial | American Journal of Clinical Nutrition | View on PubMed |
A randomized placebo-controlled clinical trial of nicotinamide riboside in obese men: safety, insulin-sensitivity, and lipid-mobilizing effects Controlled trial in 40 obese men receiving 1 g/day of NR for 12 weeks, showing good tolerance without significant change in insulin sensitivity. | ||||
| Trammell SAJ et al. | 2016 | Randomised Controlled Trial | Nature Communications | View on PubMed |
Nicotinamide riboside is uniquely and orally bioavailable in mice and humans Pharmacokinetic study demonstrating oral bioavailability of NR in humans and its efficient conversion into NAD+ and its metabolites. | ||||
| Remie CME et al. | 2020 | Randomised Controlled Trial | American Journal of Clinical Nutrition | View on PubMed |
Nicotinamide riboside supplementation alters body composition and skeletal muscle acetylcarnitine concentrations in healthy obese humans Randomized trial in 13 obese adults showing that 1 g/day of NR for 6 weeks alters body composition and skeletal muscle acetylcarnitine concentrations. | ||||