Coenzyme / NAD axisModerate evidenceNot a peptide

Nicotinamide Riboside (NR)

Another NAD+ precursor. ChromaDex's branded form (Niagen) is the most-studied. Competes with NMN for the 'oral path to NAD+' market.

What it actually is

Not a peptide. NR is a form of vitamin B3, a pyridine nucleoside that serves as a substrate for NAD+ biosynthesis via the salvage pathway. One enzyme step (NRK1/2) converts NR to NMN, then on to NAD+. Patent and IP differences from NMN drive the dueling supplement market.

Why peptide users come across it

Direct competitor to NMN in the longevity supplement market. NR has more clinical trial data than NMN (ChromaDex funded extensive human studies). Both raise NAD+, partisans argue about which is more efficient.

Mechanism

Crosses cell membrane via specific transporters, gets phosphorylated by NRK1/2 to NMN, then converted to NAD+. Functionally similar end-result to NMN supplementation; different upstream enzyme dependencies.

Documented dose range

Members only

Side effects

Mild flushing in some users
Vivid dreams
Mild GI upset
Methylation strain at high doses (consider B-complex co-factor)

Contraindications

Active cancer (NAD+ caveat)
Pregnancy and breastfeeding (insufficient data)

The Pepdex take

More human trial data than NMN, that's the honest selling point. Whether NR or NMN is 'better' is largely market positioning; both raise NAD+ measurably. Niagen costs more than generic NR for arguable purity-and-trial-data premium. If you're already on NMN with no issues, switching to NR is unnecessary.

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