# NAD+ — dosage, half-life & reference guide | PepVault

Source: https://pepvault.app/peptides/nad

Last updated: 2026-09-26

[Library](https://pepvault.app/peptides) [Longevity](https://pepvault.app/peptides#longevity) reviewed September 2026

# NAD+ Dosage, half-life & reference guide

Also known as Nicotinamide adenine dinucleotide · NAD · NAD plus

NAD+ is a coenzyme every cell needs to turn food into usable energy, and the molecule your sirtuin "longevity" enzymes and DNA-repair machinery run on. Levels fall in some tissues with age, and supplementing aims to top the pool back up.

- **Studied range:** 50–100 mg starting dose 50 mg
- **How often:** Daily
- **Half-life:** Minutes
- **Evidence:** Emerging
- **Routes:** SubQ, IV infusion +1

Studied in research — not a recommendation.

[NAD+ dose guide](https://pepvault.app/lab/dosage/nad)

## How it works.

Central coenzyme in cellular energy metabolism (redox reactions in glycolysis, the TCA cycle, and oxidative phosphorylation). Also the required substrate for sirtuins (SIRT1-7) and PARP DNA-repair enzymes. NAD+ falls with age in some tissues (the human data are mixed); supplementation aims to restore the pool that powers mitochondrial function, DNA repair, and metabolic signaling.

**Commonly reported:** A lift in energy and mental clarity within days, and flushing or nausea when it goes in too fast. Most human evidence is for the oral precursors (NMN and NR); injected NAD+ is popular but has little controlled data.

## Where NAD+ works.

- ### Brain, nerves & sleep

  **Reported by users.** Commonly reported: a lift in energy and mental clarity within days.
- ### Energy & longevity

  **Reported by users.** Central coenzyme in cellular energy metabolism (redox reactions in glycolysis, the TCA cycle, and oxidative phosphorylation).

An area lights for what a peptide is used for and what people report, with the evidence beside it. It isn’t a promise that it works there.

## Week by week.

What to expect in the first 8 weeks

- **Onset:** Days to 2 weeks
- **Peak effect:** 2–6 weeks
- **Duration:** 2–6 week blocks

1. Day 1–14 Community

   ### Refilling the cellular battery

   You're topping up the coenzyme your mitochondria run on. Commonly reported early on: a lift in daytime energy and clarity. A flush or queasiness usually tracks how fast it went in, and users find slower injections avoid it.

   The science

   NAD+ is the electron carrier in glycolysis, the TCA cycle, and oxidative phosphorylation, and the substrate sirtuins + PARPs require. Clinics and users commonly report the flush and nausea as a rate effect; no study has characterized it. Injectable NAD+ pharmacokinetics are short — it's rapidly metabolized and recycled through the salvage pathway.

   Sources

   - Rajman et al. (Cell Metabolism) (2018)

   Updated Sep 2026
2. Day 14–42 Clinical

   ### Where steady-state effects show up

   If NAD+ is doing something for you, this is the window it tends to read — more durable energy, better tolerance of training, sometimes sharper focus. Track it honestly: energy and clarity are subjective, so a simple daily note beats relying on memory.

   The science

   Human RCTs on the oral precursors NMN and NR consistently raise blood NAD+ and improve some metabolic markers (e.g. insulin sensitivity in specific populations), though clinical endpoints remain modest. Whether injectable NAD+ reaches the same intracellular pools as precursor-driven salvage synthesis is not well characterized — the mechanism is plausible, the controlled human data is thin.

   Sources

   - Yoshino et al. (NMN, Science) (2021)
   - Martens et al. (NR RCT) (2018)

   Updated May 2026
3. Day 42–84 Community

   ### A good point to take stock

   Community blocks often run 4–6 weeks then pause, but that cadence is convention, not an evidence-based endpoint. If energy or recovery moved, a break lets you see what holds without dosing. If nothing shifted, running longer probably won't change that — the decision is yours.

   The science

   No interventional trial defines an optimal duration or cycling schedule for injectable NAD+. Endogenous NAD+ is tightly regulated by the salvage pathway, so the body partly buffers exogenous input — an argument some make for intermittent rather than continuous use, though it's reasoning, not proven protocol.

   Sources

   - Covarrubias et al. (Nat Rev Mol Cell Biol) (2021)

   Updated May 2026
4. Any day Clinical

   ### What NAD+ is built on

   The biology is rock-solid: NAD+ powers energy metabolism and fuels sirtuins and DNA repair, and it declines with age in some tissues. The gap is the delivery form: the strong human trials are on oral NMN/NR precursors, while injected NAD+ rides mostly on mechanism and clinic experience. A 2026 head-to-head showed NMN and NR each roughly double blood NAD+ in two weeks; plain nicotinamide doesn't move it. Injected NAD+ has almost no controlled data: the one randomized trial gave low-dose IV NAD+ to heart-failure patients, not wellness dosing.

   The science

   Christen et al. (Nature Metabolism 2026) compared the precursors head-to-head: NMN and NR each ~doubled blood NAD+ over 14 days, while nicotinamide did not — the clearest precursor-efficacy comparison to date. NMN and NR have multiple RCTs showing they raise blood NAD+ with modest, population-specific clinical benefit. Injectable/IV NAD+ is widely used with only one small controlled trial: 180 patients with ischemic heart failure got 10 mg/day IV or placebo for 7 days, and ejection fraction was higher at one month (45.4% vs 42.4%; Yu 2025). Regulatory note: NMN was confirmed lawful as a dietary supplement by the FDA in late 2025 (Sept 29 and Dec 2), reversing the earlier uncertainty. Honest framing: high-confidence biology, high-confidence precursor pharmacology, lower-confidence injectable efficacy.

   Sources

   - Christen et al. (Nature Metabolism) (2026)
   - Yoshino et al. (Science) (2021)
   - Yu et al. (2025)

   Updated Sep 2026
5. With MOTS-c and Epitalon Community

   ### Why NAD+ pairs with mitochondrial peptides

   Different levers on the same system. NAD+ refills the coenzyme pool your mitochondria and sirtuins burn through; MOTS-c pushes the AMPK exercise-mimetic pathway. Complementary inputs to mitochondrial health rather than two versions of the same thing.

   The science

   NAD+ is a substrate (it gets consumed by sirtuins/PARPs); MOTS-c is a signal (it activates AMPK → PGC-1α → mitochondrial biogenesis). No published interaction data for the combo and no safety signal — the rationale is mechanistic complementarity, which is typically a sensible basis for stacking but isn't the same as proven synergy.

   Sources

   - Covarrubias et al. (2021)
   - Lee et al. (MOTS-c) (2015)

   Updated May 2026

Day 1 is the day you start it.

Strong biology; human efficacy data is mostly on precursors (NMN/NR), not injectable NAD+. Treat subjective effects as the main signal.

Preliminary research

## A typical run.

### Run notes

- **Cycle:** Often run in 2–6 week blocks, 2–3× per year, or low-dose continuous. Inject slowly — the hallmark NAD+ flush/nausea is dose-RATE dependent, not dose-amount dependent. No standardized injectable protocol exists; ranges are extrapolated from IV practice + community use. Often stacked with glutathione. Community practice — opinions vary. Not a clinical recommendation.
- **Timing:** Morning dosing — NAD+ is energizing and can disrupt sleep if taken late. Inject over 1–2 minutes (SubQ) to minimize flush.
- **Routes:** SubQ injection, IV infusion, Intranasal
- **Stacks:** MOTS-c, Epitalon, Glutathione

## Safety.

### Common side effects

- Flushing
- Nausea if dosed too fast
- Injection site stinging
- Transient chest tightness (fast IV)

## Goes with.

- [MOTS-c](https://pepvault.app/peptides/mots-c)
- [Epitalon](https://pepvault.app/peptides/epitalon)
- [Glutathione](https://pepvault.app/peptides/glutathione)

## Questions people ask.

### What is NAD+?

NAD+ is a coenzyme every cell needs to turn food into usable energy, and the molecule your sirtuin "longevity" enzymes and DNA-repair machinery run on. Levels fall in some tissues with age, and supplementing aims to top the pool back up.

### How is NAD+ dosed in research?

The research range for NAD+ is 50–100 mg, daily or EOD, with a 50 mg starting dose. Studied in research — not a recommendation.

### How long does NAD+ last?

The half-life of NAD+ is minutes (rapidly metabolized).

### What do people report on NAD+?

Commonly reported on NAD+: A lift in energy and mental clarity within days, and flushing or nausea when it goes in too fast. Most human evidence is for the oral precursors (NMN and NR); injected NAD+ is popular but has little controlled data.

### Is NAD+ safe?

The research basis for NAD+ is emerging: primarily preclinical / limited human data. Common side effects in the library: flushing, nausea if dosed too fast, injection site stinging and transient chest tightness (fast IV).

### What does NAD+ stack with?

Common stacks for NAD+: MOTS-c, Epitalon and Glutathione.

## Research.

The literature

### Search the latest research

[PubMed](https://pubmed.ncbi.nlm.nih.gov/?term=NAD%2B) [Google Scholar](https://scholar.google.com/scholar?q=NAD%2B)

## Reference.

- **Cadence:** Daily Daily or EOD
- **Half-life:** Minutes Minutes (rapidly metabolized)
- **Research basis:** Emerging Primarily preclinical / limited human data

## More longevity peptides

- [Humanin 2–4 mg](https://pepvault.app/peptides/humanin)
- [FOXO4-DRI 1–2 mg](https://pepvault.app/peptides/foxo4-dri)
- [SS-31 2–4 mg](https://pepvault.app/peptides/ss-31)
- [Pinealon 100–200 mcg](https://pepvault.app/peptides/pinealon)
- [Vesugen No reference dose](https://pepvault.app/peptides/vesugen)
- [Klotho 0.01–0.1 mg](https://pepvault.app/peptides/klotho)

## Free tools

- [NAD+ dose guide](https://pepvault.app/lab/dosage/nad)
- [Injection guide (3D)](https://pepvault.app/lab/injection)
- [Peptide Sky (3D)](https://pepvault.app/lab/sky)
- [Peptide tier list](https://pepvault.app/lab/tiers)
- [Reconstitution calculator](https://pepvault.app/tools/reconstitution-calculator)
- [Half-life & active level](https://pepvault.app/tools/peptide-half-life-calculator)

PepVault for iPhone

## Track NAD+ in PepVault

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Reviewed September 2026 [How we check the library](https://pepvault.app/about#library)

PepVault is a research and tracking resource, not medical advice. Ranges are what studies used, never a dose for you. Brand names are trademarks of their owners; PepVault is independent of them.

PepVault is a private research and tracking tool, not medical advice. The information here is reference material from published literature and community use — always verify it and discuss any protocol with a qualified clinician before changing it.

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