A NAD injection delivers nicotinamide adenine dinucleotide, a molecule found in every cell of your body, directly into your tissue or bloodstream. NAD+ plays a central role in how your cells convert nutrients into energy and repair damaged DNA. As you age, your natural levels decline, and the premise behind these injections is simple: replenish what your body has lost. The treatment has gained popularity in wellness and anti-aging clinics, though it remains outside the scope of FDA-approved therapies.
What NAD+ Does in Your Body
NAD+ is a coenzyme, meaning it helps other enzymes do their jobs. Its most essential role is in energy production. Inside your mitochondria, NAD+ shuttles electrons during the chemical reactions that turn food into ATP, the molecule your cells use as fuel. When NAD+ levels drop, this energy production slows down, and cells start to struggle under stress.
Beyond energy, NAD+ activates a family of proteins called sirtuins. These proteins regulate a wide range of processes: gene expression, DNA repair, inflammation, metabolism, and even your circadian rhythm. Sirtuins can only function when NAD+ is available to power their chemical reactions. Research published in Circulation Research describes sirtuins as largely responsible for the metabolic benefits of lean diets and exercise, and notes that increasing NAD+ levels, especially in older age, is linked to beneficial health effects across multiple study models.
How the Injection Works
NAD+ injections come in two main forms. Subcutaneous injections go into the fat layer just beneath the skin, while intramuscular injections go directly into muscle tissue, which has more blood vessels and typically allows faster absorption. A third option, IV infusion, delivers NAD+ directly into the bloodstream over two to four hours, but this is a clinic-based procedure rather than a simple injection.
The core argument for injecting NAD+ rather than taking it as a pill is bioavailability. The NAD+ molecule is too large to survive the digestive system intact. An oral supplement has to withstand stomach acid, get absorbed through the small intestine, and pass through the liver, where a significant portion is broken down before it ever reaches your wider circulation. This is called the first-pass effect. Even high-quality oral supplements deliver only a fraction of the dose to your cells, and your body still has to convert precursor molecules into usable NAD+, a process that can be slow and less efficient in older or stressed bodies. An IV infusion bypasses all of that, delivering 100% of the NAD+ directly to your bloodstream. Subcutaneous and intramuscular injections also skip the digestive tract, though absorption rates vary depending on the injection site.
Typical Dosages and Protocols
Dosages vary by method. Intramuscular injections typically use around 50 mg per shot. Subcutaneous protocols often start lower, around 30 mg daily for at least a week, then increase to 50 mg on weekdays. IV infusions use higher amounts: 250 mg infused over two hours, or 500 mg over four hours. These numbers are based on compounding pharmacy guidelines using a standard concentration of 100 mg per milliliter, not on FDA-approved dosing, since none exists.
Most first-time users report noticing increased energy, improved mood, and sharper mental clarity within 12 to 24 hours. These effects typically last three to five days after a single treatment. With repeated sessions, the benefits can extend to one or two weeks. Therapeutic protocols for anti-aging or detox purposes usually involve an initial series of two to four treatments, after which effects may persist for weeks or months with periodic boosters.
What People Use It For
The most common reasons people seek NAD+ injections fall into a few categories: energy and mental clarity, anti-aging, and addiction recovery.
For energy and cognitive function, the logic is straightforward. More NAD+ means more efficient mitochondrial energy production and better-functioning sirtuins, which influence everything from inflammation to how your cells handle stress. People often describe feeling more alert, sleeping more deeply, and recovering faster from exercise.
The anti-aging angle centers on DNA repair. Two specific sirtuins, SIRT6 and SIRT7, are directly involved in fixing DNA damage, a process that becomes less efficient as NAD+ levels fall with age. Early research in yeast showed that boosting the activity of sirtuin-related genes reduced DNA damage and extended lifespan. Whether this translates meaningfully to human aging remains an open question, but it drives much of the clinical interest.
Addiction treatment is perhaps the most visible use. Some clinics offer NAD+ infusions as part of detox protocols for opioid and alcohol withdrawal, based on the idea that restoring cellular energy metabolism can ease withdrawal symptoms and reduce cravings. However, WebMD notes that NAD therapy is not approved to treat addiction or withdrawal and has not been tested in enough people to confirm that it works or how well. The evidence remains preliminary.
Side Effects and Risks
Most side effects are mild. Pain, redness, or burning at the injection site is the most common reaction. Headaches and nausea also occur frequently, with nausea sometimes triggered by stimulation of the vagus nerve during treatment.
Less common reactions include a firm lump under the skin where the injected fluid hasn’t dispersed, heart palpitations from metabolic shifts, and temporary changes in blood pressure that can cause dizziness. People with heart conditions or arrhythmias should get clearance from a cardiologist before starting treatment.
Rare but serious complications are possible. These include severe infection at the injection site and, in the worst case, sepsis from contaminated products. This risk is not theoretical. The FDA has received adverse event reports following use of injectable NAD+ products, including severe chills, shaking, vomiting, and fatigue serious enough to require medical treatment. The agency traced these reactions to endotoxin contamination, which is consistent with products made from food-grade ingredients not suitable for injection.
Regulatory Status
NAD+ injections are not FDA-approved for any medical condition. They are produced by compounding pharmacies, which mix custom formulations that fall outside the standard drug approval process. This is a significant distinction because it means the products have not undergone the rigorous safety and efficacy testing required for approved medications.
The FDA has specifically warned that some compounders are using food-grade NAD+ sold by repackagers to make intravenous products. Food-grade ingredients carry a high risk of contamination with microbes and endotoxins and are not suitable for sterile drug compounding without additional processing. This means the quality and safety of NAD+ injections depend heavily on the pharmacy producing them, and there is no standardized oversight ensuring consistency across providers.
It is also worth noting that no published clinical evidence currently demonstrates the safety, efficacy, or clinical benefit of NAD+ administered via subcutaneous or intramuscular injection. The theoretical basis is strong, the animal data is promising, and individual reports of benefit are widespread, but large-scale human trials have not been completed. Anyone considering this treatment is essentially making a decision based on incomplete evidence, which makes choosing a reputable provider and understanding the risks all the more important.