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Source comparison

NAD+ Nasal Spray: Comparison Across Delivery Methods

Intranasal Spray 85–90% 15–30 minutes Bypassed entirely 1–2× daily Highest systemic NAD+ delivery. No hepatic degradation, rapid onset, consistent plasma levels Oral Capsules (NAD+) 5–15% 90–120 minutes Complete hepatic conversion to nicotinamide 2–3× daily Fu

This comparison does not assign a generated winner or score.

  • Intranasal Spray
  • 85–90%
  • 15–30 minutes
  • Bypassed entirely
  • 1–2× daily
  • Highest systemic NAD+ delivery. No hepatic degradation, rapid onset, consistent plasma levels
  • Oral Capsules (NAD+)
  • 5–15%
  • 90–120 minutes
  • Complete hepatic conversion to nicotinamide
  • 2–3× daily
  • Functionally a precursor supplement. Most NAD+ is degraded before systemic absorption
  • Sublingual Tablets (NAD+)
  • 30–45%
  • 45–60 minutes
  • Partial bypass (swallowed portion undergoes metabolism)
  • 2× daily
  • Better than oral capsules but inconsistent. Depends on saliva volume and user compliance with hold time
  • Intravenous NAD+
  • 100%
  • Immediate
  • Clinical setting only
  • Maximum bioavailability but requires medical supervision, sterile technique, and carries infusion site risks
  • Oral NMN or NR (Precursors)
  • 40–60% (as precursor)
  • 60–90 minutes
  • Converted to nicotinamide, then requires cellular salvage pathway
  • More reliable than oral NAD+ but still depends on salvage pathway efficiency. Benefit tied to baseline NAD+ status
  • Intranasal delivery occupies the space between practical self-administration and meaningful systemic absorption. It's the only non-invasive route that delivers NAD+ as the intact coenzyme rather than a precursor requiring cellular conversion.