Understand the source comparison
Comparison Table: NAD+ Delivery Methods and Bioavailability
Different NAD+ delivery methods produce vastly different bioavailability and cellular uptake rates. This table compares oral NAD+, NAD+ precursors, sublingual delivery, and intravenous administration. Oral NAD+ capsules 2–5% Degraded by gut enzymes; too large/
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- Different NAD+ delivery methods produce vastly different bioavailability and cellular uptake rates. This table compares oral NAD+, NAD+ precursors, sublingual delivery, and intravenous administration.
- Oral NAD+ capsules
- 2–5%
- Degraded by gut enzymes; too large/polar to cross intestinal membranes
- Minimal to none
- Not recommended. Bioavailability too low for meaningful effect
- Oral NMN or NR
- 40–60% (precursor)
- Crosses membranes via specific transporters (Slc12a8 for NMN, ENTs for NR); converted intracellularly
- 30–90 minutes
- Gold standard for daily supplementation. Balances efficacy and practicality
- Sublingual NMN
- 50–70% (precursor)
- Bypasses first-pass liver metabolism; absorbed through oral mucosa
- 15–45 minutes
- Faster onset than oral; useful for pre-workout or acute cognitive demands
- IV NAD+ infusion
- 95–100%
- Direct bloodstream delivery; no GI degradation
- Immediate (during infusion)
- Highest bioavailability but requires clinical setting; expensive and impractical for daily use
- Liposomal NAD+ or NMN
- 30–50%
- Lipid encapsulation protects from degradation; fuses with cell membranes
- 45–90 minutes
- Moderate improvement over standard oral; cost premium often not justified