NAD+ Peptide Therapy: What It Is, How It Works, and Who It's For

NAD+ is not technically a peptide. It's a coenzyme called nicotinamide adenine dinucleotide that every cell uses to make energy and repair DNA [1]. It's often grouped with longevity peptides because clinicians prescribe injectable NAD+ alongside peptide protocols to support mitochondrial function and healthy aging. Access usually requires a licensed clinician and a 503A compounding pharmacy.

Is NAD+ actually a peptide?

No. NAD+ (nicotinamide adenine dinucleotide) is a coenzyme made of two nucleotides joined together — not a chain of amino acids, which is what defines a peptide [1]. So why does it show up on peptide clinic menus? Because the wellness and longevity field often uses 'peptide therapy' as shorthand for a broader category of injectable compounded therapies that includes peptides like epitalon and thymosin alpha-1, plus NAD+ and related molecules.

The label is imprecise, but the clinical pairing is real: many longevity protocols combine NAD+ with true peptides because they target overlapping pathways — mitochondrial energy, cellular repair, and inflammation.

What does NAD+ do in the body?

Cellular energy (mitochondria)

NAD+ is essential for turning food into ATP, the energy currency of the cell. Inside mitochondria, NAD+ shuttles electrons during the reactions that produce ATP [1]. When NAD+ is low, energy production drops, which researchers have linked to fatigue and reduced exercise capacity in older adults [2].

DNA repair and sirtuins

NAD+ is also a required fuel for two protein families: PARPs, which repair damaged DNA, and sirtuins (including SIRT1), which regulate stress response, inflammation, and metabolic health [5]. Sirtuins have been nicknamed 'longevity proteins' because activating them in animal studies extends healthspan — though human evidence is still emerging.

Why NAD+ declines with age

NAD+ levels fall as we age. One contributing mechanism is CD38, an enzyme that consumes NAD+ and increases with chronic inflammation [6]. Human and animal studies have measured tissue NAD+ dropping substantially between middle age and older adulthood [2]. This decline is one mechanism researchers think contributes to age-related metabolic and cognitive changes.

What are the potential benefits of NAD+ therapy?

Energy and metabolism

Small studies of oral NAD+ precursors have shown changes in insulin sensitivity and mitochondrial markers in older or metabolically compromised adults [4][7]. Patients receiving injectable NAD+ sometimes report better energy and exercise tolerance, but high-quality randomized trials of injectable NAD+ specifically are limited. Side effects such as flushing, nausea, and injection-site reactions can occur and are discussed below. NAD+ is not approved to treat fatigue, metabolic syndrome, or any energy-related condition.

Cognitive function

Animal studies suggest NAD+ restoration may protect neurons and improve memory [8]. Early human trials of NR have shown changes in brain biomarkers, but cognitive improvements in healthy adults have been modest and inconsistent [4]. NAD+ is not approved to treat cognitive decline or any neurologic condition, and should be avoided in pregnancy, breastfeeding, and active cancer.

Longevity and cellular aging

Restoring NAD+ extends lifespan in worms and mice and improves measures of biological aging in rodents [5]. In humans, we don't yet have lifespan data — only surrogate markers like changes in walking endurance and inflammation in some small trials [7]. NAD+ is being studied for healthy aging, not approved as a treatment for aging. It should be avoided in pregnancy, breastfeeding, and active cancer, and used cautiously in people with cardiovascular, liver, or kidney disease.

How is NAD+ given? Injections vs. IV vs. oral precursors

Subcutaneous NAD+ injections

Compounded subcutaneous NAD+ is injected under the skin, similar to how GLP-1 medications are given. It's convenient for at-home use after clinician training. Doses are smaller than IV infusions, so side effects tend to be milder, though injection-site redness, soreness, and nausea can still occur. Specific dosing must be set by a prescribing clinician.

IV NAD+ infusions

Intravenous NAD+ delivers higher amounts over several hours in a clinic. Infusions are usually slowed because faster rates can cause chest tightness, flushing, and nausea — well-known rate-related effects [9]. IV NAD+ should only be administered in a clinical setting with monitoring.

NMN and NR oral precursors

NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside) are oral compounds the body converts into NAD+. Both have been shown to raise blood NAD+ levels in trials [4]. NR is sold as a dietary supplement; NMN's regulatory status has shifted in recent years, so check current FDA guidance. Oral precursors don't require a prescription but produce smaller, slower changes than injections, and their long-term clinical benefits are still being studied. Even oral precursors can cause GI upset and may interact with other therapies, so they should be discussed with a clinician.

What does a typical NAD+ protocol look like?

Protocols vary widely between clinicians and are tailored to the individual. In general educational terms, compounded subcutaneous NAD+ programs often involve a loading phase of more frequent dosing for several weeks, followed by a less frequent maintenance phase. IV protocols are typically a short series of infusions, sometimes repeated periodically.

Specific doses, frequency, and duration depend on age, goals, lab results, and tolerance, and must be set by a prescribing clinician. There's no single 'right' protocol, and self-dosing isn't safe. This article does not provide individualized dosing guidance.

What are the side effects and safety considerations of NAD+?

Most side effects are dose- and infusion-rate-related. The most commonly reported include:

• Flushing or warmth, especially during IV infusions [9]
• Nausea or stomach upset
• Chest pressure or tightness during fast IV infusions [9]
• Headache
• Injection-site redness or soreness with subcutaneous dosing
• Fatigue immediately after dosing in some people

NAD+ has not been adequately studied in pregnancy, breastfeeding, or in people with active cancer, and is generally avoided in those populations. People with significant cardiovascular, liver, or kidney disease should only consider NAD+ under specialist supervision. Because injectable NAD+ is compounded, product quality depends heavily on the pharmacy's standards [3]. Any new symptoms during therapy should be reported to the prescribing clinician promptly.

How do I get NAD+ injections through a licensed provider?

Because NAD+ injections are prescription compounded preparations, you can't buy them at a regular pharmacy or order them online without a clinical evaluation. The standard path looks like this:

1. 1Complete an evaluation with a licensed clinician (telehealth or in-person), including medical history and often baseline labs.
2. 2If appropriate, the clinician writes a prescription that is sent to a licensed 503A compounding pharmacy.
3. 3The pharmacy prepares the patient-specific NAD+ formulation and ships it to you, along with supplies and instructions.
4. 4You schedule follow-up visits to monitor response, side effects, and dose adjustments.

Several licensed telehealth platforms now offer this evaluation pathway. Chia Health is one such option — a telehealth provider that connects patients with licensed clinicians who can evaluate eligibility for compounded longevity therapies including NAD+, and coordinate with a 503A pharmacy if a prescription is appropriate. For broader context on this access model, see our overview of compounded medications and how telehealth peptide access typically works.

How much does NAD+ therapy cost?

NAD+ is almost always self-pay. Costs vary by route, dose, pharmacy, and region. Subcutaneous compounded NAD+ programs commonly fall in a range of a few hundred dollars per month. IV infusions are typically more expensive per session because of clinic time and supplies. Oral NMN or NR supplements are generally the least expensive option. Insurance typically does not cover NAD+ for longevity indications. Always confirm current pricing directly with the provider and pharmacy.

How does NAD+ compare to other longevity peptides?

NAD+ is often used alongside true peptides in longevity protocols. They target different but complementary pathways. Here's how they compare at a high level — these are educational summaries, not treatment recommendations, and all carry side-effect and contraindication considerations that should be reviewed with a clinician.

For more on the broader category, see our longevity peptides overview, the epitalon peptide guide, and the thymosin alpha-1 guide.

Frequently asked questions

Keep reading

Peptides

NAD+: cellular energy, DNA repair, and the longevity molecule — 2026 evidence-based guide

Peptides

SS-31 (Elamipretide): the mitochondrial-targeted peptide — 2026 evidence-based guide

Peptides

Epitalon: the telomerase-activating longevity peptide — 2026 evidence-based guide