What does 500 mg on a NAD+ vial mean?
A vial labeled 500 mg describes the total mass of NAD+ in that vial. It is not, by itself, a dose, a concentration or a schedule. Concentration requires a final solution volume: 500 mg in 5 mL is 100 mg/mL, while 500 mg in 10 mL is 50 mg/mL. The same vial mass can therefore correspond to different volumes for a specified amount.
Vial arithmetic: mass, concentration and volume
The arithmetic is concentration in mg/mL = total mass in mg divided by final volume in mL. For an amount that has already been specified, volume in mL = that amount divided by the concentration. These examples demonstrate unit conversions; their amounts and volumes are assumed inputs.
| Total vial mass | Assumed final volume | Calculated concentration | Volume corresponding to an assumed 25 mg |
|---|---|---|---|
| 500 mg | 5 mL | 100 mg/mL | 0.25 mL |
| 500 mg | 10 mL | 50 mg/mL | 0.50 mL |
| 500 mg | 20 mL | 25 mg/mL | 1.00 mL |
On a U-100 scale, 100 marks correspond to 1 mL. Accordingly, 0.25 mL corresponds to 25 marks and 0.50 mL to 50 marks on that specific scale. A syringe mark is a volume designation in this calculation, not a universal NAD+ mass. Changing the concentration changes the mass associated with the same mark.
What human NAD+ infusion research measured
Grant and colleagues' 2019 pilot assigned eight healthy men to an intravenous NAD+ infusion and three to saline. The NAD+ group received 750 mg over six hours. Researchers measured plasma and urine metabolites during the infusion and afterwards. This was a small metabolism experiment, not a comparison of 500 mg schedules or a trial establishing a longevity benefit.
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Why NAD+ is not the same intervention as NR or NMN
NAD+ is a cofactor. Nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN) are related precursors with different administered molecules and study protocols. Findings from a precursor study do not supply a dose conversion for an injected NAD+ vial. Likewise, a change in a blood metabolite is different from demonstrated improvements in symptoms, function or lifespan.
Does buffering determine a 500 mg protocol?
No. Buffering describes a formulation property. A laboratory study compared NAD+ and NADH stability in three aqueous buffers under specified temperatures and pH conditions, rather than testing a human dosing schedule. The actual formulation, concentration and route remain separate variables. See the buffered versus unbuffered NAD+ evidence comparison.
Frequently asked questions
Is 500 mg a single dose?
The number is the labeled total vial mass. It does not identify a single administration amount or frequency.
How many syringe marks are in 25 mg?
That cannot be calculated from vial mass alone. With the assumed 100 mg/mL concentration above, 25 mg equals 0.25 mL, or 25 marks on a U-100 scale. At 50 mg/mL it equals 0.50 mL, or 50 marks.
Did the 2019 pilot prove a longevity protocol?
No. It examined short-term metabolites in a small group and did not measure a lifespan outcome or compare repeated dosing schedules.
Sources
- Grant et al., 2019: plasma and urine metabolite changes during a six-hour NAD+ infusion
- Wolfe et al., 2024: NAD+ and NADH stability in aqueous buffers
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