First peptides

NAD+ for beginners

NAD+ is a cell helper molecule, rather than a peptide. It is not FDA-approved. Promise Peptides prescribes now. U.S. patients only. A licensed U.S. provider reviews each request and decides. Not everyone qualifies. Availability varies by state and treatment. Compounded medicines are not FDA-approved.Visit Promise Peptides for NAD+. Neo may earn money when readers become Promise patients.

5 min read. Updated 8 October 2026.

The short version

NAD+ stands for nicotinamide adenine dinucleotide. It is not a peptide. It is a coenzyme, a helper molecule that every cell in your body uses in the chemical reactions that turn food into usable energy.

Your body makes NAD+ itself, and the amount in several tissues tends to fall with age. That is why people have become interested in topping it up, through supplement pills, drips into a vein, or injections.

Studies in people show that some supplement pills raise NAD+ levels in the blood. Whether that leads to better health is still unproven, and the drips and injections have the least research behind them. No NAD+ product is an FDA-approved drug.

What NAD+ is

Think of NAD+ as a delivery van inside the cell. In the reactions that release energy from food, it picks up tiny charged particles called electrons and passes them along, so the cell can make its energy supply. The "+" in the name tells chemists which form it is in: NAD+ is the empty van, and NADH is the loaded one.

NAD+ has a second job. Some enzymes, the proteins that speed up chemical reactions, use NAD+ up as they work. These include enzymes involved in repairing DNA, the cell's instruction code.

Your cells make NAD+ from tryptophan, an amino acid you get from food, and from related molecules called nicotinic acid and nicotinamide. They also recycle it.

So why is it on a peptide site? Because the clinics and online services that offer peptides often offer NAD+ too, and beginners meet the two side by side.

Why levels fall, and why people care

Research in several tissues, including skin, muscle, brain and blood, suggests NAD+ levels drop by somewhere around 10 to 50 percent across adult life. Studies in mice point to one reason: an enzyme called CD38, which breaks NAD+ down, becomes more active with age.

Most of the dramatic results you may read about come from mice. Animal results often do not carry over to people.

Where the research stands

The forms you will see work in different ways, and the evidence is very different for each.

Pills of NAD+ itself. NAD+ is poorly taken up by cells in its whole form, and some experts consider plain NAD+ capsules largely ineffective.
Pills of precursors. A precursor is a raw material the body turns into something else. The two studied most are NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside). Several randomized trials, where people are assigned by chance to the supplement or a dummy pill, show they raise NAD+ in the blood. Results for anything beyond that blood level are mixed. A 2025 review of the human evidence concluded that effects on health have so far been limited.
Drips and injections. These have the weakest evidence. In a small 2019 study, researchers measured NAD+ and related substances in blood and urine during a six-hour infusion into a vein. A 2026 look back at clinic records linked drips with stomach upset, a faster heartbeat and chest pressure.

Where NAD+ stands with the FDA

NAD+ is not an FDA-approved drug in any form. As a pill, it and its precursors are sold as dietary supplements. As an injection or drip, NAD+ is usually made by a compounding pharmacy, which makes a medicine to order from a prescription. Compounded medicines are not FDA-approved. Like other compounded injections, they can be contaminated if they are not prepared properly.

Sports rules cover both substances and how they are given. An NAD+ drip can fall under anti-doping restrictions even if NAD+ itself is not a banned substance. Athletes need to check their sport's current rules.

What a prescription route looks like

With a licensed route, a clinician looks at your health history and your other medicines before anything is decided, and the answer can be no. If an injection is prescribed, a licensed pharmacy decides separately whether it can lawfully prepare it, and a prescription does not guarantee that it will. Because injected products skip the body's first defences, how carefully they are made matters.

That is the difference from a product sold for lab research and labelled not for human use: there, no one reviews your health, and it is hard to know what is really inside.

What is not known

Whether raising NAD+ improves health in people. Blood levels go up; hard outcomes such as living longer or avoiding disease have not been shown.
How injected NAD+ compares with pills. Controlled studies are few.
Cancer. Growing cells use NAD+ too, so researchers raise a theoretical concern about boosting it in people with cancer.
What is in the bottle. Supplement quality varies widely, and outside lab testing of what is inside is not assured.

Talking to a licensed clinician about NAD+

Promise Peptides is a U.S. telehealth platform. Promise prescribes peptides now through licensed U.S. providers. A licensed U.S. provider reviews every request and your health history, then decides whether to prescribe. Not everyone qualifies, and the answer can be no. Prescribed medicines are prepared by licensed U.S. compounding pharmacies. Each pharmacy separately decides whether it can lawfully prepare a prescription; a prescription does not guarantee it will be filled. Compounded medicines are not FDA-approved. How Neo is paid for sets out the rest. U.S. patients only. Availability varies by state and by treatment. Promise is LegitScript-certified. That certification is not FDA approval.

Visit Promise Peptides for NAD+

Neo may earn money when readers become Promise patients.