NAD+ injections deliver nicotinamide adenine dinucleotide, a molecule found in every cell of your body, directly into your tissue via a needle. The goal is to raise your levels of this molecule faster and more completely than oral supplements can. NAD+ is essential for converting food into energy, repairing damaged DNA, and keeping your cells functioning as you age. Clinics market these injections for everything from anti-aging and mental clarity to addiction recovery, though the evidence behind many of these claims is still largely based on animal research.
What NAD+ Does in Your Body
NAD+ is a coenzyme involved in hundreds of metabolic reactions. Its two most critical jobs are energy production and DNA repair. Inside your mitochondria, NAD+ helps drive the chain of reactions that turns nutrients into ATP, the energy currency your cells run on. Without adequate NAD+, this process slows down, and cells become sluggish.
When your DNA gets damaged (which happens constantly from sun exposure, pollution, normal metabolic stress, and aging), repair enzymes consume NAD+ at a dramatic rate. DNA damage can ramp up NAD+ consumption by as much as 500-fold. If your body can’t keep up, the deficit cascades: damaged mitochondria aren’t cleared out properly, cells produce more harmful reactive oxygen species, and DNA damage accumulates further. This cycle is now considered one of the core mechanisms behind aging itself.
NAD+ levels naturally decline with age. Researchers have identified nine cellular changes that drive age-related decline, and falling NAD+ levels intersect with several of them, including DNA damage, mitochondrial dysfunction, and cellular senescence (when cells stop dividing and start releasing inflammatory signals). Restoring NAD+ to youthful levels in animal studies has reversed multiple metabolic conditions and improved cardiovascular function.
Why Injections Instead of Pills
The NAD+ molecule is large and highly polar, which means it doesn’t cross cell membranes easily and gets broken down in your gut before reaching your bloodstream. Several studies have confirmed that taking NAD+ by mouth does not effectively raise NAD+ levels in plasma or tissues. The intestinal environment degrades it, and whatever survives can’t passively enter cells. High oral doses of NAD+ have also been linked to insomnia, fatigue, and anxiety.
Intravenous infusion is currently the only clinically recognized method to directly increase NAD+ levels in humans. Injections (subcutaneous or intramuscular) offer a middle ground: they bypass the digestive system and deliver NAD+ into tissue where it can be absorbed into the bloodstream, though absorption is slower than an IV drip. Oral precursors like NMN and NR take a different approach entirely. Rather than delivering NAD+ directly, they provide building blocks your body converts into NAD+. NMN, for instance, reaches the bloodstream from the intestine within 2 to 3 minutes and arrives in tissues within 15 minutes in animal studies, but plasma levels return to baseline quickly.
How the Injections Are Given
Most people who use NAD+ injections at home receive subcutaneous shots, meaning the needle goes into the fat layer just under the skin. Common injection sites include the abdomen (at least two inches from the navel), the outer upper arm, the front or outer thigh, and the upper buttocks. Subcutaneous injections provide slow, steady absorption and are simple enough for self-administration.
Intramuscular injections go deeper into muscle tissue, which allows faster uptake into the bloodstream and can accommodate larger volumes of fluid. These are typically given by a healthcare professional because of a higher risk of hitting a nerve or causing tissue injury.
A common starting protocol uses a concentration of 100 mg/mL and begins with 30 mg daily (0.3 mL) for at least one week. After that initial period, some protocols increase to 50 mg on weekdays only. Vials need to be refrigerated between 36 and 46°F and used within 28 days of the first puncture.
What People Use Them For
The most popular reasons people seek out NAD+ injections are anti-aging, energy, cognitive sharpness, and recovery from substance use. The science behind these applications varies considerably in strength.
In animal models of neurodegenerative diseases like Alzheimer’s and Parkinson’s, boosting NAD+ levels restores mitochondrial function, improves neuronal survival, enhances memory, and reduces the brain inflammation that drives disease progression. NAD+ augmentation has also been shown to promote the growth of new neural progenitor cells in Alzheimer’s mouse models and to protect motor neurons from oxidative stress in models of ALS. These findings are compelling but have not yet been replicated in large human clinical trials.
The addiction recovery angle has a longer anecdotal history. Some clinics have used high-dose NAD+ IV therapy for decades as part of detox protocols, reporting that it reduces withdrawal symptoms and cravings. The biological rationale is sound: NAD+ supports the enzymes involved in synaptic plasticity and neuronal stress resistance, both of which are disrupted by chronic substance use. Rigorous controlled trials remain limited, however.
Side Effects and Safety Concerns
The most common side effects are mild and typically resolve within hours. These include nausea, stomach discomfort, flushing or a warm sensation, headache, lightheadedness, fatigue, and mild redness or tenderness at the injection site. With IV infusions specifically, many of these reactions are tied to how fast the drip runs. Slowing the rate usually reduces symptoms.
More serious but less common reactions include allergic responses (skin rash, difficulty breathing, low blood pressure), significant spikes in inflammation markers (seen in up to 70% of patients in some reports), signs of glucose intolerance or liver stress with long-term or high-dose use, and worsening of mood disorders. Injection site infections are possible any time a needle breaks the skin, particularly outside of sterile clinical settings.
The FDA has flagged a specific safety concern. In October 2024, the agency issued a reminder that some compounding pharmacies have been using food-grade NAD+ to make injectable products. Food-grade ingredients carry a high risk of contamination with bacteria and endotoxins, which are not acceptable in sterile preparations. The FDA has received adverse event reports following use of these products, including severe chills, shaking, vomiting, and fatigue serious enough to require medical treatment. These reactions are consistent with endotoxin contamination, not NAD+ itself.
What They Cost
Single NAD+ injection sessions at clinics across the U.S. typically range from $25 to $200, depending on the dose and location. A 100 mg intramuscular shot runs about $40 to $95 at most clinics. Monthly injection packages average $105 to $350. Online subscription services like Hone Health and Shed offer monthly plans in the $165 to $169 range, which usually include the medication and sometimes a membership fee.
IV infusions cost significantly more because they take longer (often 1 to 4 hours), require medical supervision, and use higher doses. A single IV session ranges from $250 for a low-dose drip up to $1,500 or more for high-dose protocols. Some premium clinics charge $2,000 per session. Insurance does not cover NAD+ therapy, so all costs are out of pocket.
Regulatory Status
NAD+ injections are not an FDA-approved drug for any condition. They are available through compounding pharmacies, which prepare custom medications that aren’t commercially manufactured. This means the quality, purity, and potency of what you receive depends entirely on the compounding pharmacy your provider uses. The FDA’s 2024 warning about food-grade ingredients underscores that not all compounded NAD+ products meet the same safety standards. If you’re considering NAD+ injections, asking your provider which pharmacy compounds their product and whether it uses pharmaceutical-grade ingredients is a reasonable step.