What do NAD+ injections do?

NAD+ injections deliver a coenzyme called nicotinamide adenine dinucleotide into your body, where it helps your cells convert food into usable energy and supports DNA repair. In practice, people use them hoping for steadier energy, faster recovery, better sleep, and clearer thinking, and the underlying cell biology offers a plausible reason why. What the research does not yet show is that injected NAD+ reliably produces those outcomes in healthy adults, because the human trials are small, short, and mostly done with oral precursors rather than injections.

This guide covers what NAD injections actually are, what the evidence supports, what it doesn't, what they cost, and where to get them legally. It's educational and isn't medical advice.

What is NAD+, and why does it decline with age?

NAD+ is a coenzyme found in every living cell. It has two main jobs.

Energy production. Your mitochondria, the structures inside cells that generate ATP (your body's energy currency), cannot run without NAD+. It acts as an electron shuttle, picking up electrons from the food you've broken down and delivering them into the machinery that produces ATP. Fewer shuttles means a slower production line, even with plenty of fuel available.

Repair and stress response. NAD+ is the required raw material for two enzyme families: sirtuins, which regulate metabolism and cellular stress responses, and PARPs, which repair damaged DNA. When those systems are busy, during illness, inflammation, poor sleep, or intense training, they consume NAD+ that would otherwise go toward making energy.

Now the part most articles get wrong. The standard claim is that NAD+ drops steadily with age, and that's the whole story. It isn't. Some studies have found lower NAD+ in aging human tissue, including skin and skeletal muscle. But whole-blood NAD+ measured across seven separate human cohorts stayed remarkably stable with age and did not change with lifestyle interventions [1]. A review of the human evidence concluded that age-related NAD+ decline in people is inconsistent, and that data on NAD+ inside human tissues is sparse [2].

The most defensible reading: NAD+ availability probably does decline in some tissues under some conditions, blood tests are a poor window into that, and we don't yet have the tissue-level human data to say much more.

What do NAD injections do in the body?

Injecting NAD+ subcutaneously (into the fat layer under the skin, with a very small needle) bypasses your digestive tract. That matters because NAD+ taken orally is largely broken down before it reaches circulation, which is why oral products typically use precursors like NMN or NR instead of NAD+ itself.

Once absorbed, NAD+ and its breakdown products enter the pool your cells draw from. Here's what the human evidence actually supports, organized from strongest to weakest:

Raising measurable NAD+ levels: well supported. In a randomized, placebo-controlled crossover trial, 24 healthy adults aged 55 to 79 took either 1,000 mg/day of nicotinamide riboside or placebo for six weeks, and NAD+ in their immune cells rose about 60% [3]. Later trials have replicated the basic finding that supplementation raises NAD+.

Physical function: modest, mixed signals. In a 60-day trial, 80 healthy middle-aged adults took 300, 600, or 900 mg of NMN daily or placebo; six-minute walking distance improved significantly versus placebo, most clearly in the higher-dose groups [4]. In a separate 12-week trial, 60 older adults took 250 mg/day of NMN and had faster 4-meter walking times and better sleep-quality scores than placebo, though that study's own primary outcome, a stepping test, showed no difference between groups [5].

Fatigue and sleep: early and inconsistent. A randomized trial gave 2,000 mg/day of nicotinamide riboside to people with long COVID for up to 20 weeks. It did not significantly improve cognition, fatigue, sleep, or mood versus placebo; only exploratory, within-group analyses hinted at improvement after about 10 weeks. It was a small, single-center study, which the authors flagged as a reason to read the signal cautiously [6].

Energy, focus, and recovery in healthy people: mechanistically plausible, clinically unproven. This is what most people actually buy NAD+ for, and it's where the evidence is thinnest. Notably, in that crossover trial, raising NAD+ by about 60% did not change VO₂ max, resting metabolic rate, insulin sensitivity, or motor function [3].

What NAD+ injections don't do

This section exists because the marketing around NAD+ has gotten far ahead of the science. Being clear about the limits is how you make a good decision.

• They don't reverse aging. No human trial has shown that NAD+ supplementation extends lifespan or reverses biological aging. Impressive results in mice have repeatedly failed to translate cleanly to humans.
• They aren't a weight-loss treatment. There is no credible human trial evidence that NAD+ causes fat loss. If a provider pitches it that way, that's a marketing claim, not a clinical one.
• They aren't a treatment for any disease. NAD+ is not FDA-approved for fatigue, cognitive decline, addiction, long COVID, or anything else. Injectable NAD+ is dispensed as a compounded prescription product, which means it isn't FDA-approved and the FDA doesn't evaluate it for safety, effectiveness, or quality.
• They won't fix an undiagnosed cause of fatigue. This is the important one. Thyroid dysfunction, iron deficiency, sleep apnea, anemia, and depression are common, treatable, and routinely missed. If you're exhausted, the first step is finding out why, not adding an injection on top of an unanswered question.
• They aren't a substitute for sleep, food, and movement. Nothing in the research suggests NAD+ compensates for chronic short sleep or inactivity.

A reasonable way to hold all this: NAD+ is a plausible, generally well-tolerated option worth trying under supervision after the obvious causes have been ruled out, not a first move, and not a shortcut.

Who typically considers NAD+ therapy

In practice, the people who ask about it tend to fall into a few groups:

• Adults in their 40s to 60s noticing a gradual drop in stamina and mental sharpness, whose standard labs come back normal
• People recovering from a prolonged illness or a period of heavy stress, dealing with lingering fatigue and brain fog
• Athletes and heavy trainers focused on recovery between sessions
• People already pursuing longevity protocols who want to add a NAD+-targeted intervention with provider oversight
• Shift workers and frequent travelers whose circadian rhythm is chronically disrupted

Who should hold off: anyone pregnant, trying to conceive, or breastfeeding (there's no safety data); anyone with an active or recent cancer diagnosis, since NAD+ metabolism intersects with cell proliferation; anyone with significant kidney or liver disease; and anyone with a new, unexplained symptom that hasn't been diagnosed yet.

Where to buy NAD+ injections

If you're wondering where to buy NAD injections, the short answer is that injectable NAD+ is a prescription product in the US, so every legitimate route involves a licensed provider. You have three realistic options.

1. Telehealth providers. You complete an online intake, a licensed provider reviews your health history (along with any lab work arranged through your own provider or physician), and if it's appropriate you receive a prescription filled by a licensed compounding pharmacy and shipped to your door. You self-inject at home in under a minute. This is generally the least expensive supervised route and the easiest to sustain, since there are no appointments to schedule. What to verify: US-licensed prescribers, a named compounding pharmacy partner, whether they coordinate with your own provider on any needed lab work, and real follow-up rather than a single transaction.

2. IV drip bars and wellness lounges. These offer NAD+ intravenously, usually as a walk-in service. The appeal is a larger single dose; the drawbacks are cost, clinic time, and tolerability. In a small real-world pilot study, all six participants who received 500 mg of NAD+ intravenously reported moderate-to-severe abdominal cramping, nausea, and chest pressure during infusion, symptoms that stopped when the infusion did; sessions averaged 97 minutes because participants slowed their own drip rate [7]. Ask who is medically supervising, and be skeptical of any venue treating this as a spa service.

3. Medical clinics and longevity practices. In-person evaluation with a physician, nurse practitioner, or PA, often offering both IM shots and IV. Best suited to people with complex medical histories. Expect higher prices and, in many practices, membership fees.

What to avoid: any site selling NAD+ vials without a prescription, especially those labeled "for research use only, not for human consumption." That label is how these sellers try to sidestep drug regulations, not a technicality. These products aren't made to pharmaceutical standards, they're injected, and no one is screening you for contraindications. The FDA has issued warning letters to companies marketing unapproved injectable drugs to consumers.

Cost overview

Budget separately for any lab work your provider orders, roughly $80 to $300 for a baseline panel. Insurance almost never covers NAD+ for wellness or longevity purposes, so plan on paying out of pocket.

Frequently asked questions

What are NAD injections, exactly?
They're prescription injections of nicotinamide adenine dinucleotide, a coenzyme your cells use for energy production and DNA repair. Most commonly they're given subcutaneously at home, though clinics also offer intramuscular shots and IV infusions. Because there's no FDA-approved NAD+ injectable product, they're prepared by licensed compounding pharmacies against a prescription, and compounded products are not FDA-approved or evaluated by the FDA for safety, effectiveness, or quality.

Are NAD+ injections safe?
Subcutaneous dosing is generally well tolerated. Common effects are mild and short-lived: injection-site redness, flushing, mild nausea, or a brief headache. The severe cramping and chest pressure sometimes reported with IV NAD+ largely reflect how fast the dose enters the bloodstream. Long-term safety data in healthy adults is limited, which is a real gap, not a reassurance.

How is NAD+ injection therapy different from taking NMN or NR?
Injections deliver NAD+ directly, bypassing digestion and absorption variability. Oral NMN and NR are precursors your body converts into NAD+, and they have considerably more randomized trial data behind them. Neither is clearly superior; the trade-off is evidence quality versus delivery efficiency.

Do I need a prescription for NAD+ injections?
Yes. Injectable NAD+ requires a prescription from a licensed provider in the US. Oral supplements like NMN and NR are sold over the counter, but the injectable form is not.

Next steps

If you're weighing NAD+ therapy, the sensible next step is a clinical review, not a checkout page. With Luvo, you complete a short intake questionnaire (about two minutes) covering your health history, current medications, and goals. A licensed provider reviews it and decides whether NAD+ is appropriate or whether another option fits better; nothing is prescribed or shipped without that review. If it's approved, a licensed compounding pharmacy fills and ships it, and your provider adjusts the plan through a short check-in every four weeks. Any lab work is arranged through your own provider or physician.

Explore Luvo's Longevity Program.