NAD Injections: Benefits, Side Effects, and What to Expect

NAD+ pen therapy is self-injection of NAD+ (nicotinamide adenine dinucleotide) under the skin with a prescribed pen injector, usually 50 to 100 mg subcutaneous doses at home one or more times a week instead of a 2 to 4 hour IV drip. No NAD+ pen, vial or IV product is FDA approved for any condition: the pens are filled by compounding pharmacies on a prescription, and the best known human study of NAD+ given into the body, Grant and colleagues (2019), tested an IV infusion, not injections.

If you have looked into NAD+ therapy, you have probably seen the IV infusion version first: the one where you sit in a clinic for 2-4 hours with an IV drip. It is the most familiar format. It also costs $500-$1,500 per session, by common clinic quotes, and requires a time commitment that most people cannot sustain long term.

NAD injections are the practical alternative. Same molecule, different delivery method. Instead of a slow IV drip, NAD+ is injected directly into muscle tissue (intramuscular) or under the skin (subcutaneous). The injection takes under a minute, costs less per session, and can be self-administered at home with proper guidance from a prescribing physician.

NAD injections, NAD+ pens and IV infusions differ in dose, cost, side effects and regulation, and the evidence behind them is uneven.

What Is NAD+ Pen Therapy?

NAD+ pen therapy is a home format for NAD+ subcutaneous injection. A compounding pharmacy fills a pen injector, or a cartridge that loads into a reusable pen, with a sterile NAD+ solution. The patient dials the prescribed dose, attaches a fresh pen needle and injects into the fat layer of the abdomen or thigh.

The drug is the same NAD+ used in NAD IV therapy and in vial-based NAD injections. What changes is the delivery device. Telehealth services and longevity, integrative and functional medicine clinics sell it under names such as NAD+ pen, NAD+ injection pen and NAD+ pen therapy.

How is a NAD+ pen different from a vial and syringe?

A pen measures the dose with a dial, so there is no drawing up from a vial and less room for measuring errors. A vial and syringe is the older format, usually cheaper per milligram, and lets the clinician give larger intramuscular doses. Both are compounded products prescribed by a licensed clinician.

Who is NAD+ pen therapy aimed at?

Pens are aimed at people who want ongoing maintenance dosing without weekly clinic visits. Clinics most often offer them after an in-clinic loading phase, or to patients already using oral precursors such as NMN (nicotinamide mononucleotide) or NR (nicotinamide riboside) who want a stronger route.

How NAD Injections Work

NAD+ is a coenzyme required for over 500 enzymatic reactions in your body. It drives cellular energy production (ATP), feeds sirtuins and PARP enzymes involved in DNA repair, and plays a central role in mitochondrial function. NAD+ levels decline roughly 50% between ages 40-60, a figure widely cited by clinics, and lower levels are associated with declining energy, cognitive function and recovery capacity.

The decline itself is documented in human tissue. Massudi and colleagues (PLOS ONE, 2012) measured skin samples from 49 people and found a strong negative correlation between age and NAD+ levels in both men and women. A 2021 review by Covarrubias and colleagues in Nature Reviews Molecular Cell Biology links the fall to enzymes such as CD38 that consume NAD+.

When NAD+ is injected intramuscularly, it enters the bloodstream through absorption from muscle tissue. Subcutaneous injection, the route used by NAD+ pens, absorbs from the fat layer under the skin. Both are slower than IV delivery (which puts NAD+ directly into the bloodstream) and avoid the digestive breakdown that limits oral NAD+ supplements (roughly 2-10% bioavailability).

What to Expect During NAD Injections

Before Your First Injection

A careful provider will take a health history, review your medications, discuss your goals, and may run baseline labs (metabolic panel, inflammatory markers). Some clinics measure intracellular NAD+ levels before and after treatment, though this testing is not yet standardized. For pen therapy prescribed by telehealth, the same intake usually happens by video, with labs drawn at a local lab.

The Injection Itself

NAD+ is typically injected into the gluteal muscle (buttock), deltoid (upper arm), or subcutaneously into the abdomen or thigh. The injection takes 30-60 seconds. You may feel a brief sting at the injection site, and some people report a warm flushing sensation or mild nausea for 10-15 minutes afterward. These effects are similar to, but usually much milder than, those experienced during IV infusions. With a NAD+ pen, the dose goes under the skin of the abdomen or thigh and the sting tends to be the main sensation.

After the Injection

Many people report increased energy and mental clarity within 30-60 minutes. Some describe it as a “brain turned on” feeling. Others notice more subtle effects, such as better sleep quality, improved recovery from exercise, or reduced brain fog over the first week of treatment. These are patient reports rather than trial results, and the experience varies widely between individuals based on baseline NAD+ levels, age and overall health status.

NAD Injection Benefits: What the Evidence Supports

The evidence for NAD+ is strongest at the level of cell biology and weakest at the level of patient outcomes from injections. The table below separates the two, and the paragraphs after it name the human studies that exist.

What human studies exist on NAD+ and its precursors?

The most cited human study of NAD+ given directly into the body is a pilot by Grant and colleagues (Frontiers in Aging Neuroscience, 2019). They infused NAD+ intravenously for 6 hours and found that plasma NAD+ and its metabolites did not change for the first 2 hours, meaning the body removed the infused NAD+ rapidly. The study did not test intramuscular or subcutaneous injections or measure symptoms.

Oral precursor trials are larger and better controlled. In a randomized, double-blind, placebo-controlled crossover trial, Martens and colleagues (Nature Communications, 2018) found that six weeks of nicotinamide riboside was well tolerated and raised NAD+ metabolism in healthy middle-aged and older adults. No trial of comparable design has been published for NAD+ injections or NAD+ pens, so their benefits rest on mechanism, precursor data and clinic experience.

Ongoing NAD+ studies are listed on ClinicalTrials.gov, including work on chronic fatigue syndrome, long COVID, neurodegenerative disease and metabolic health. None has led to an FDA approval.

Side Effects of NAD Injections

Clinics report that side effects of NAD injections are generally mild and short lived. No large controlled trial has catalogued them for injections or pens, so the lists below reflect clinic experience rather than measured rates:

Common, according to clinic reports:

• Injection site soreness or bruising (resolves in 1-2 days)
• Mild flushing or warmth lasting 10-20 minutes
• Brief nausea (much less common than with IV infusions)

Less common:

• Mild headache (usually first 1-2 sessions only)
• Lightheadedness for 5-10 minutes post-injection
• Muscle cramping at injection site

With NAD+ pens and other subcutaneous injections, the most frequent complaint is a stinging or red patch at the injection site. Redness that spreads, warmth that grows over a day or two, fever, hives or trouble breathing are reasons to stop and contact the prescriber or urgent care.

Is NAD+ Pen Therapy FDA Approved?

No. The FDA has not approved any NAD+ product for injection, whether it comes in a pen, a vial or an IV bag, and it has not approved NAD+ for any of the uses clinics offer it for. Injectable NAD+ is a compounded drug, prepared by a pharmacy for a patient with a prescription.

That status matters for quality. In its Compounding and the FDA questions and answers, the agency states that compounded drugs are not FDA approved and that it does not verify their safety, effectiveness or quality before they are marketed. State boards of pharmacy oversee 503A pharmacies, while 503B outsourcing facilities register with the FDA and must follow current good manufacturing practice (CGMP).

What does that mean for a patient?

It means the pen or vial is only as reliable as the pharmacy that made it and the clinician who prescribed it. Ask which pharmacy compounds the product, whether it is a 503A or 503B facility, and whether the clinic can share a certificate of analysis. A NAD+ pen sold without a prescription, a clinician visit or a named pharmacy is outside the normal compounding pathway.

Dosing Protocols: What Clinics Typically Recommend

NAD injection dosing has no FDA label and no dose-finding trial behind it. The protocols below are common clinic conventions, and a prescriber adjusts them to tolerance and response.

How is a NAD+ pen dosed?

NAD+ pens are almost always used at maintenance doses, because subcutaneous injections hold a smaller volume than intramuscular ones. The prescriber sets the dose in milligrams and the pharmacy label converts it into the number of clicks or units to dial. Doses vary with the concentration each pharmacy compounds, so the label on your pen is the only reliable guide. Our NAD+ dosage guide compares oral, injection and IV ranges side by side.

NAD Injections vs. IV NAD Therapy: Which Should You Choose?

NAD injections and NAD+ pens trade dose size for convenience, while NAD IV therapy trades time and cost for the largest dose per session. The table compares the two formats on the factors patients ask about most.

A common clinic approach: start with an IV loading series if your budget allows (2-4 IV sessions over 1-2 weeks), then switch to injections or a NAD+ pen for long-term maintenance. If the IV cost or time is prohibitive, many clinics run injection-only protocols with a slightly longer loading phase. No head-to-head trial has compared the two approaches, so the choice rests on cost, time, needle comfort and your prescriber's judgment. For a fuller look at the infusion side, see the NAD IV therapy treatment guide, and for oral options, our comparison of IV NAD+ and oral supplements.

Self-Injection at Home: What You Need to Know

Many clinics now prescribe NAD+ for at-home self-injection, either as a multi-dose vial with syringes or as a NAD+ pen, which lowers cost and adds convenience. Here is how it typically works:

1. Initial consultation: physician evaluation (often telehealth) to confirm candidacy and prescribe NAD+.
2. Compounding pharmacy ships medication: NAD+ arrives as a sterile solution in a multi-dose vial or a prefilled pen, refrigerated.
3. Training: the clinic provides injection technique training (video or in-person). Subcutaneous injection into the abdomen is the most common self-injection method.
4. Self-administer on schedule: follow the prescribed protocol. Rotate injection sites. Store medication refrigerated.
5. Follow-up: periodic check-ins with the prescribing physician to adjust dosing.

At-home NAD+ injections typically cost $200-$600 per month depending on dose and frequency, compared to $2,000-$6,000+ monthly for clinic-based IV infusions at the same frequency, according to commonly quoted clinic pricing.

How do you use a NAD+ pen at home?

Standard pen injector technique looks like this; your pharmacy's instructions for the specific pen take priority.

1. Wash your hands and check the solution is clear, in date and was kept cold.
2. Attach a new pen needle for every injection and prime the pen if the instructions call for it.
3. Dial the dose, swab the skin of the abdomen or thigh, and pinch a fold.
4. Insert the needle, press the button fully and hold for several seconds before withdrawing.
5. Rotate sites each time, and put the used needle straight into a sharps container, following the FDA guidance on disposing of used needles.

Who Prescribes NAD Injections and Where to Find Them

NAD injections and NAD+ pens are prescribed by licensed clinicians: physicians (MD or DO), nurse practitioners and physician assistants, and in some states naturopathic doctors. They are usually offered by integrative, functional, longevity and addiction medicine practices, by IV therapy clinics, and by telehealth services that ship pens from a compounding pharmacy.

Many clinics that list NAD IV therapy also offer NAD injections or pens, so the national directory of NAD+ therapy clinics is a good place to start a shortlist. State pages narrow it further, for example NAD+ clinics in Texas, Florida NAD IV providers and NAD therapy in New York. Clinics often pair NAD+ with related services such as IV vitamin therapy and peptide therapy.

Regenerated.com is free for patients, and listing order is not paid ranking. Featured slots are labeled and capped, and Verified means a clinic has completed credential checks, not that it paid. Inclusion in the directory is not an endorsement, and the guide to Featured, Verified and organic listings explains each label.

The Bottom Line on NAD Injections and NAD+ Pens

NAD injections and NAD+ pen therapy deliver the same compounded NAD+ used in IV drips, in smaller doses that take under a minute and can be given at home. The biology of NAD+ is well established, but evidence that injections or pens improve energy, cognition or aging outcomes is limited to clinic experience and small studies, and no NAD+ injection product is FDA approved. If you try it, use a licensed prescriber, know which pharmacy compounds your NAD+, and start low.

Frequently Asked Questions

How quickly do NAD injections work?

Many people report more energy and mental clarity within 30-60 minutes of their first injection, though these are patient reports rather than trial findings. Improvements in sleep quality, recovery and sustained energy tend to build over the first 1-2 weeks of consistent treatment. If you notice nothing after 4-6 injections, discuss dose adjustment with your provider, or whether NAD+ is the right fit for your goals at all.

Are NAD injections painful?

NAD injections cause brief, mild discomfort. An intramuscular shot feels like a pinch lasting 1-2 seconds, NAD+ can sting as it enters the tissue, and some people feel warmth or flushing for 10-15 minutes afterward. Subcutaneous NAD+ pen injections use a thinner, shorter needle. Both are usually easier to tolerate than IV NAD+ infusions, which often cause nausea and chest tightness during the 2-4 hour drip.

Can I combine NAD injections with oral NAD+ supplements (NMN/NR)?

Yes, many longevity-focused protocols do. Clinics use injections or a NAD+ pen for direct NAD+ dosing and oral precursors, NMN or NR at typically 500-1,000mg a day, for daily support between injection days. The precursors have the stronger trial record: Martens and colleagues (2018) found nicotinamide riboside well tolerated in middle-aged and older adults. No trial has tested the combination, so agree the plan with your prescriber.

How long do the effects of NAD injections last?

Patients commonly report that the energy and clarity from one injection last 24-72 hours. With consistent dosing over several weeks, many say improvements in energy, focus and sleep hold between sessions. NAD+ is continuously consumed by enzymes such as sirtuins, PARPs and CD38, so levels fall again without ongoing dosing. That is why clinics frame injections and NAD+ pens as maintenance therapy rather than a one-off treatment.

Who should NOT get NAD injections?

Pregnant or breastfeeding women, people allergic to any ingredient in the compounded solution, and people with active cancer who have not cleared it with their oncologist are usually advised against NAD injections. Safety data in pregnancy are lacking, and NAD+ supports cell energy broadly, so a theoretical tumor concern exists without evidence of harm. Because no NAD+ injection is FDA approved, there is no official contraindication list. People taking opioids or in addiction treatment should use NAD+ only under that care team.

Are NAD injections covered by insurance?

No. NAD+ therapy, whether given by IV, injection or NAD+ pen, is treated as an elective, off-label service and is not covered by major US health insurance carriers. Some HSA or FSA accounts may reimburse it with a physician’s letter of medical necessity, but this varies by plan administrator. Ask the clinic for an itemized receipt that lists the prescriber and the compounded product if you plan to submit a claim.

Related Reading

• NAD+ IV Therapy: The Complete Guide: our pillar guide covering the science, evidence, and clinical applications of NAD+
• Peptide Therapy Guide: many patients combine NAD+ with peptides like BPC-157 and Selank, although these combinations have not been tested in trials
• Brain Fog: Causes and Solutions: NAD+ is one of several approaches clinics offer for chronic brain fog, alongside a medical workup for its causes
• Biofeedback Therapy: a complementary approach for supporting nervous system function alongside NAD+
• NAD+ Dosage by Route: oral, subcutaneous and IV dosing ranges compared in one place