Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| HMB | NR (Nicotinamide Riboside) | |
|---|---|---|
| Category | Supplements | Supplements |
| Standard Dose | — | 300-600mg daily |
| Timing | — | Morning with or without food. |
| Cycle Duration | — | ongoing |
| Evidence Level | Moderate | Moderate-Strong |
Leucine metabolite that reduces muscle protein breakdown and may support recovery under high training or caloric deficit conditions.
NR is converted to NMN by nicotinamide riboside kinases (NRK1/NRK2), then to NAD+ via the salvage pathway. Like NMN, elevated NAD+ activates sirtuins, PARPs, and CD38. NR has demonstrated ability to cross the blood-brain barrier and elevate brain NAD+ levels. It supports mitochondrial function, DNA repair, and circadian rhythm regulation through SIRT1-mediated deacetylation of BMAL1 and CLOCK proteins.
300-600mg daily
Morning with or without food.
ongoing
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