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.