NAD+ gets described in marketing copy as everything from a “fountain of youth molecule” to a “cellular battery”. Neither is accurate. Here is what it actually does.
It is a coenzyme, not a fuel
NAD+ (nicotinamide adenine dinucleotide) is present in every cell in your body. The clearest way to think about it is as a shuttle.
Turning food into usable energy is a chain of chemical reactions, and several of those steps involve moving electrons from one molecule to another. NAD+ is the thing that carries them. It picks up electrons at one step (becoming NADH), drops them off at another, and returns to being NAD+ ready to go again.
It is not consumed the way fuel is. It cycles.
Where that cycle happens
Most of it happens in your mitochondria, the compartments inside your cells where the majority of ATP — the molecule cells actually spend as energy — gets produced. If the NAD+ pool available to those reactions is smaller, the throughput of that process is lower.
That is the entire mechanistic argument for the category, stated honestly.
The other jobs
Energy metabolism is the best-understood role, but NAD+ is also a substrate for several families of enzymes — including sirtuins and PARPs — that are involved in DNA repair processes and in regulating how genes are expressed. Those enzymes consume NAD+ rather than recycling it, which is one reason the pool needs continuous replenishing.
This is an area of active research. It is also the area where supplement marketing tends to get furthest ahead of the evidence, so treat confident claims about it with suspicion — including from us.
What changes with age
Published research reports that tissue NAD+ levels tend to be lower in older adults than in younger ones. That observation is what launched this product category.
Two things are worth being precise about:
- It is a finding about measured levels, not about how anyone feels.
- Observing that levels differ is not the same as demonstrating that raising them with a supplement produces a specific outcome.
Anyone selling you certainty here is selling you something that is not in the literature yet.
Where supplements fit
A NAD+ supplement is a dietary supplement taken to support those everyday cellular processes. Two things determine whether one is worth taking:
- What form it is in. NAD+ is a large, fragile molecule. Liposomal delivery wraps it in a phospholipid shell, the same class of material your cell membranes are built from, as a way of protecting it through digestion.
- What else is in the bottle. Compounds such as resveratrol, pterostilbene, quercetin, glutathione, alpha lipoic acid and astaxanthin are commonly formulated alongside it.
How to read a label properly
Check the serving size before the headline number. “1,000 mg” across four capsules is not the same offer as 1,000 mg across two. Check whether the product is third-party tested, and check whether the company will tell you where it was manufactured. If any of those three are missing from the page, that is information too.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare professional before use if you are pregnant, nursing, taking medication, or have a medical condition.