NAD+ Side Effects
Medically reviewed by Dr. Jonathan Snipes, MD
Reviewed for clinical accuracy · Last reviewed July 22, 2026 · Review policy
Quick answer
The most common NAD+ side effects are flushing, warmth, or nausea (iv, infusion-rate related), and are usually mild and dose-related. Serious effects are less common; the full breakdown and cautions are below.
| Effect | Frequency |
|---|---|
| Flushing, warmth, or nausea (IV, infusion-rate related) | Common |
| Chest or abdominal tightness during IV | Less common |
| Injection-site reactions | Reported |
| Headache | Reported |
The most common NAD+ side effects come from IV administration and are related to how fast it is infused: flushing, nausea, warmth, and a sensation of chest or abdominal tightness, which typically ease when the drip is slowed. Subcutaneous injections can cause local reactions. Oral precursors are generally well tolerated. None of this establishes long-term benefit, which is the actual open question.
Frequently asked questions
What are the most common NAD+ side effects?+
The most common NAD+ side effects are flushing, warmth, or nausea (iv, infusion-rate related). See the full frequency table above for less common and rare effects.
Is NAD+ safe?+
NAD+'s human safety is not well characterized because it has not completed formal human safety trials. Any use should be through a licensed clinician and a legitimate pharmacy, not research-chemical suppliers.