Topic

What does NAD do?

NAD is a molecule every cell uses to shuttle energy and run repair enzymes — and its levels decline with age, which is why it anchors so much longevity research.

This topic collects our articles on NAD injections and the science around them: what NAD actually does, what supplementation research shows, side effects, and how injectable NAD compares with oral precursors like NMN and NR. Injectable NAD through Promise is prescription-only after a provider review. Oral precursors and injections are not interchangeable, and the articles below explain the difference.

5 articles on this topic

  1. A woman in a sage top and navy trousers waters a houseplant during her morning routine

    How Long Do Peptides Take to Work?

    Peptide timelines range from hours on a lab test to months on a scale. The useful answer depends on the molecule, the outcome being measured and the quality of the evidence behind it.

    September 2, 2026 · Elena Marsh, Health Writer
  2. A woman in a sage sweater rests on a linen sofa in a quiet sunlit room

    NAD Injection Dosage: What Human Studies Used

    There is no validated subcutaneous or intramuscular NAD+ schedule. The best-known IV pharmacokinetic study used 750 mg over six hours, so a prescriber must set route, concentration, amount and frequency together.

    August 31, 2026 · Elena Marsh, Health Writer
  3. A woman in a sage shirt sits in an armchair beside a window holding a plain mug

    Is NAD a Peptide? What NAD+ Actually Is

    NAD+ is a dinucleotide coenzyme, not a peptide. Its chemistry, cellular jobs, and evidence are different from the peptide therapies it often appears beside.

    August 30, 2026 · Priya Raman, Health Writer
  4. A man in a long-sleeve shirt and work trousers kneels beside a raised vegetable bed in a small garden

    NAD Injection Side Effects: What Is Reported

    Published intravenous data describe transient infusion-associated symptoms in one small retrospective series and no reported adverse events in an earlier slow-infusion pilot; because the studies differed in design and did not randomize infusion rate, they do not establish speed as the cause.

    August 27, 2026 · Julian Reyes, Health Writer
  5. A woman stands at a sunlit kitchen counter in the morning, holding a cup of coffee and looking out the window.

    A Patient's Guide to NAD+ Injections

    NAD+ is a coenzyme found in every living cell, yet most human trial data comes from oral precursors like NR and NMN — including a 2025 meta-analysis in adults with mean ages of 61 to 83 that found no significant muscle benefit.

    August 12, 2026 · Nadia Okonjo, Health Writer