NAD+ Quick Guide

NAD+ injections deliver nicotinamide adenine dinucleotide (NAD+), a coenzyme in every cell, directly into the body through subcutaneous injection or intravenous (IV) infusion. They’re used in integrative and functional medicine for energy support, healthy aging, cognitive clarity, addiction recovery, and metabolic health. Both compounded NAD+ preparations and clinic-administered protocols are available. Access depends on a prescriber’s evaluation.

About NAD+

How does it work?

Your cells rely on NAD+ to make energy. It shuttles electrons through glycolysis and the Krebs cycle to drive ATP synthesis, the process your cells use to produce usable fuel. NAD+ also powers two key enzyme families: sirtuins (SIRT1–7), which regulate gene expression and stress response, and PARPs (poly(ADP-ribose) polymerases), which patch DNA damage. As described in research published in Cell Metabolism, NAD+ metabolism sits at the center of energy homeostasis, balancing activity between mitochondria and the nucleus.

A third enzyme, CD38, is the body’s primary NAD+ consumer. CD38 activity rises with age and chronic inflammation, steadily draining your NAD+ stores. By middle age, tissues may hold roughly half the NAD+ they had in youth, a pattern documented in age-associated NAD+ metabolism research published in PLoS ONE.

Animal and cell model research shows that replenishing NAD+ may restore mitochondrial function and stimulate mitophagy (the process of clearing out damaged mitochondria) in models of accelerated aging, as demonstrated in a Nature Communications study on NAD+ augmentation in Werner syndrome. That’s preclinical data. Among the available human pharmacokinetic data, a small pilot trial administered 750 mg of NAD+ by IV over six hours to healthy male participants; the study did not formally assess subjective symptoms, but no serious lab changes were observed compared to the control group. Large-scale randomized controlled trials don’t yet exist for most claimed benefits. Individual responses vary, and the evidence base is still developing.

Available forms

Four delivery routes exist for NAD+. Subcutaneous injection and IV infusion have the most clinical use.

  • Subcutaneous injection: Self-administered at home after prescriber instruction. A small insulin-type syringe delivers NAD+ into fatty tissue on the abdomen or back of the arm.
  • IV infusion: Clinic-administered over several hours via slow drip. Achieves the highest plasma NAD+ levels.
  • Oral supplements (NMN or NR): Available without a prescription. These are NAD+ precursors, not NAD+ itself, and have more evidence for directly raising NAD+ levels compared to injectable forms.
  • Nasal spray: An emerging delivery route with limited human data.

Compounded NAD+ comes as a lyophilized (freeze-dried) 500 mg powder. You reconstitute it with bacteriostatic water before use. The prescriber and pharmacy set the specific formulation and dose.

One important regulatory note: NAD+ is not FDA-approved for any specific medical indication. Compounded NAD+ preparations do not undergo FDA review for safety, efficacy, or quality prior to distribution, and the agency has issued general guidance regarding the potential risks associated with compounded drug products.

For these reasons, working with a licensed prescriber and a reputable, accredited compounding pharmacy is essential. As detailed in the FDA’s compounding Q&A, compounded preparations are distinct from commercially approved drugs and are subject to different regulatory standards.

Your Testing-to-Treatment Journey

Step 1: Lab tests to consider first

Baseline labs give your prescriber a clear picture of your metabolic health before starting NAD+ therapy. They check liver and kidney function, flag inflammation, and help put your energy and fatigue symptoms in context.

 

If your CRP is high, your NAD+ may be depleting faster than average. If your CMP shows reduced kidney function, your prescriber will factor that into dosing. These aren’t disqualifying findings on their own. They’re context. Talk with a licensed provider about what your specific results mean before starting.

Step 2: What happens during a prescriber consult

Your prescriber reviews your medical history, current medications, baseline labs, and goals. They screen for key contraindications: known allergy to NAD+ or formulation components, active cancer or cancer history, pregnancy or breastfeeding, severe liver or kidney impairment, and unstable cardiovascular disease.

There’s no BMI threshold for NAD+ therapy. Candidacy is based on your symptoms, health status, and goals. Both telehealth platforms and in-person integrative or functional medicine clinics offer evaluations. A prescription is required.

Step 3: Starting therapy

Subcutaneous protocols usually start at about 20 mg per injection and titrate up gradually to about 100 mg. Most prescribers schedule injections one to three times weekly during the initial phase. Maintenance often settles at 50–100 mg weekly. Slow titration matters. The side effects most people notice (headache, nausea, dizziness) are dose- and rate-dependent, and building up gradually lets your body adjust.

You can self-administer subcutaneous injections at home once your prescriber walks you through the technique. IV infusions are clinic-administered. For intensive addiction detox protocols, IV doses of 500–1,000 mg/day over four to ten days are used under direct medical supervision.

Some prescribers recommend not going above about 300 mg/week subcutaneously without further evaluation. That’s a clinical practice guideline, not a regulatory limit. Your prescriber and pharmacy set the specific protocol.

Step 4: Labs to recheck on therapy

Monitoring labs help your prescriber see how you’re tolerating NAD+ therapy, catch any transient changes in liver markers at higher doses, and track whether your metabolic picture is shifting.

From the Testing.com Medical Review Board

“In practice, the first few weeks of NAD+ therapy are largely about tolerance, whether you’re handling the dose escalation without significant headache or gastrointestinal symptoms. Energy and cognitive changes, when they occur, tend to emerge gradually over four to eight weeks rather than right away. If nothing is noticeable by week eight and labs are unremarkable, that’s the conversation point for reassessing dose or delivery route.”

Testing.com Editorial Review Board

Safety and Side Effects

Common side effects

Most people notice only mild, short-lived reactions: headache, nausea, dizziness, lightheadedness, or flushing. Minor injection site irritation, like redness or a brief burning feeling, is also common. These effects depend mostly on the dose and on how fast NAD+ is given. With a rapid IV infusion in particular, NAD+ widens blood vessels (vasodilation), which can cause flushing, a drop in blood pressure (hypotension), a faster heart rate (tachycardia), and chest tightness.

Slowing the drip usually settles these symptoms, but they’re real cardiovascular responses, not just minor nuisances. That’s why unstable cardiovascular disease is a contraindication: an unstable heart may not tolerate the sudden shifts in blood pressure and heart rate that fast infusion can cause.

A 2019 pilot study published in Frontiers in Aging Neuroscience gave 750 mg of NAD+ by IV over six hours (about 2 mg/min). The study didn’t formally track subjective symptoms, but no serious lab changes showed up compared with the control group. Clinical observation has also found that a fast IV drip can cause immediate headache or shortness of breath, while a slower drip usually doesn’t.

How to manage them

Prescribers usually rely on a few tactics to improve tolerance:

  1. Slow the IV drip rate: This is the primary adjustment for infusions, as a slower rate typically alleviates acute dizziness, chest tightness, or headache.
  2. Titrate subcutaneous doses gradually: Beginning at approximately 20 mg and titrating up allows the body to build tolerance before reaching maintenance levels.
  3. Add TMG (trimethylglycine): Since NAD+ metabolism consumes methyl donors, some prescribers recommend TMG to support the methylation pathway and potentially reduce fatigue or headache. This is a clinical consideration to discuss with your provider.
  4. Maintain hydration: Ensure adequate fluid intake on scheduled injection days.

What gets adjusted depends on your prescriber’s assessment.

Serious risks and contraindications

NAD+ doesn’t carry a formal boxed warning, but several firm contraindications apply. Don’t use NAD+ if you have a known allergy to NAD+ or any formulation component; if you’re pregnant or breastfeeding (no safety data exists); if you have severe liver or kidney impairment; or if you have unstable cardiovascular disease.

Cancer history deserves particular caution. NAD+ therapy may accelerate cancer growth and interfere with cancer treatments, so anyone with active cancer or any cancer history should avoid it, not just monitor it closely. The concern is mechanistic: cancer cells lean on NAD+ to fuel their rapid metabolism (the Warburg effect) and use NAD+-dependent enzymes to repair the DNA damage that chemotherapy and radiation are meant to cause. Higher NAD+ levels have been tied to tumor growth and worse outcomes in several cancers, and drugs that block NAD+ production are themselves being studied as cancer treatments (Palmer RD, Aging Medicine, 2021).

Talk through your full medical history, including allergies and organ function, with your prescriber before starting any injectable therapy.

Drug and supplement interactions

No significant drug interactions with NAD+ injection have been identified in the medical literature to date. NAD+ is a naturally occurring coenzyme, and it does not appear to interfere with common medications based on current knowledge. The absence of known interactions partly reflects limited formal study, though. It’s not a confirmed all-clear.

The TMG note above is relevant here too: it’s not a drug interaction in the traditional sense, but it’s a practical consideration for how your body clears NAD+ metabolites. Share your full medication and supplement list with your prescriber before starting.

Cost and Access

Cost ranges as of May 2026. Pricing varies by pharmacy and shortage status; confirm with the dispensing pharmacy before committing to a multi-month plan.

Typical cost

Subcutaneous compounded NAD+ injections run $50–$150 per vial or $150–$400 per month depending on dose and frequency. IV infusion sessions at clinics generally cost $200–$600 per session. Insurance doesn’t usually cover NAD+ injections. These are directional ranges; actual pricing varies by provider and location.

How to get it

A prescription from a licensed provider is required. You can access NAD+ therapy through telehealth platforms that route prescriptions to compounding pharmacies, or through in-person integrative and functional medicine clinics. Subcutaneous self-injection at home is possible once your prescriber walks you through the technique. IV infusions require clinic visits. Search for integrative medicine clinics or telehealth platforms offering peptide and NAD+ therapy to find options near you.

Frequently Asked Questions

Do NAD+ injections really work?

It depends on what you’re asking about. Among the available human pharmacokinetic data, a small pilot study administered 750 mg IV over six hours and observed no serious lab changes in the treatment group compared to controls; the study did not formally assess subjective symptoms. Many reported benefits (energy, cognitive clarity, healthy aging support) are backed by preclinical and animal research plus anecdotal reports, but not by large randomized controlled trials. Talk with a licensed provider about whether NAD+ therapy fits your situation.

What are the benefits of NAD+ injections?

Stated uses include energy support, healthy aging, cognitive clarity, addiction recovery support, and metabolic health. These are areas of active investigation. Most supporting evidence is preclinical or from small human studies. Don’t expect the same results as someone else. Your baseline NAD+ levels, inflammation status, and overall health all affect how you respond.

What is the starting dose for NAD+ injections?

Subcutaneous protocols usually start at about 20 mg per injection and titrate up to about 100 mg. Maintenance is often 50–100 mg weekly. IV protocols use higher doses: 500–1,000 mg for intensive detox protocols. These are clinical practice ranges, not trial-established doses. Your prescriber and pharmacy determine the specific protocol for you.

How often do you get NAD+ injections?

During the initial phase, subcutaneous injections are given one to three times weekly. Maintenance often drops to weekly or biweekly. IV protocols are less frequent for general wellness; intensive addiction detox protocols may run daily for four to ten days. Frequency depends on your goals and tolerance. There’s no single schedule that fits everyone.

NAD+ injections vs. pills: what's the difference?

Injectable forms deliver NAD+ directly into the body, bypassing the digestive system. Oral supplements sold over the counter are typically NMN or NR, which are NAD+ precursors, not NAD+ itself. They have less evidence for directly raising NAD+ levels compared to injectable forms. Injections require a prescription. Oral supplements don’t. Which form makes sense depends on your goals and what a prescriber recommends.

Are NAD+ injections safe?

The honest answer is that the human safety evidence is thin. The most-cited study (Grant et al., 2019) was a pharmacokinetic look at just eight healthy men: it tracked how NAD+ moves through the body, not whether it works or whether it’s safe long term. Common side effects (headache, nausea, dizziness) are usually mild and depend on how fast NAD+ is given, but large-scale, long-term safety data don’t yet exist. Avoid NAD+ if you have a cancer history, are pregnant or breastfeeding, or have severe liver, kidney, or cardiovascular disease, and don’t use it without prescriber supervision.

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