Coenzyme · established cellular biology
What is NAD+?
NAD+ stands for nicotinamide adenine dinucleotide. It is a coenzyme, a small helper molecule used by enzymes, rather than a peptide. Cells continually make, use and recycle it. Its role in normal biology is well established; that does not establish the effectiveness of every product sold under the NAD+ name.
How does NAD+ work?
NAD+ accepts electrons during metabolic reactions and becomes NADH. This reversible change helps connect the breakdown of nutrients with energy production. Other enzymes consume NAD+ in reactions involved in cellular signalling and DNA-damage responses. [1]
What does the research show?
A 2021 review of NAD+ homeostasis explains how synthesis, recycling and consumption influence cellular function and disease. It describes a complex metabolic system, rather than a simple relationship in which more NAD+ always means better health. [1]
What the evidence does not establish
NAD+, NADH and precursors such as nicotinamide riboside are different substances. A result involving one form, route or population cannot automatically support another. Cell biology alone does not show that an NAD+ infusion increases energy, slows ageing or treats a disease.
Safety questions to discuss
Ask what exact substance and formulation a product contains, which human studies support that route, and how risks are monitored. A normal molecule in the body is not automatically safe in an injected product. [2]
Frequently asked questions
Is NAD+ a peptide?
No. It is a coenzyme involved in metabolism, not a chain of amino acids.
Does NAD+ biology prove anti-ageing benefits?
No. An essential cellular role is different from evidence that a particular supplement or infusion improves health outcomes.
Sources and further reading
- NAD+ homeostasis in human health and disease — biochemical review, 2021
- Cellular and Mitochondrial NAD Homeostasis in Health and Disease, 2023
These are selected sources, not a systematic review. Check publication dates, study methods and the exact substance tested. Artwork does not establish clinical benefit.