NAD+
The fuel every cell burns, injected slowly for energy, clearer thinking and recovery. Push it fast and you learn why 'slowly' matters.
What it is
NAD+ is the molecule your cells use to turn food into energy and to repair DNA, and your levels fall steadily from your 40s on. People inject it every other day for steadier energy, less brain fog and faster bounce-back from hard weeks and hard nights. It is not a peptide, it is a coenzyme, and the one rule that matters is to inject it slowly.
The people who get the most from NAD+ are over 40 with the afternoon crash, the brain fog that arrived with the gray hairs, and the sense that a bad night costs two days now. Shift workers and frequent flyers use it for the jet-lag and sleep-debt recovery. People coming off heavy drinking use it because NAD+ clinics made their name on withdrawal and hangovers. And the longevity crowd runs it as the base layer of a mito stack: in the engine picture we use, MOTS-c is the gas pedal, SS-31 is engine efficiency, and NAD+ is the fuel in the tank.
What you notice, and when: this is one of the few things on the site with a felt effect. Some people get a lift the same day, most within the first week or two: a calmer, more even energy rather than a stimulant buzz, better sleep, and the fog thinning in the mornings. Give it three weeks before judging. What it will not do is fix a bad diet, replace sleep, or make you feel younger if you already feel fine; a healthy 30-year-old usually feels nothing from it.
Baseline is 50 mg subQ every other day, which is 50 units from a 500 mg vial mixed with 5 ml, and the ceiling here is 100 mg every other day; some work up toward daily. The first dose is the one to respect: push it over a full minute or two, not a second, because fast NAD+ brings a wave of flushing, chest tightness and nausea that passes in minutes but is genuinely unpleasant. Start with 25 mg if you are nervous. A 500 mg vial is 10 doses at 50 mg, about three weeks every other day, and it should stay cold and dark and be used within a few weeks. The mistakes: injecting fast, under-diluting (it needs the full 5 ml per 500 mg), and trying to copy clinic IV doses, which run to several hundred milligrams over hours, at home.
On evidence: animal 3, human 2. The age-related decline in NAD+ is well replicated, and animal work on sirtuins, PARPs and mitochondrial function is deep. Human trials are mostly on the oral precursors NMN and NR, which raise blood NAD+ reliably with modest functional results so far; direct NAD+ injection has small studies on tolerability and uptake and a lot of clinic experience, but no large trial showing it does what people feel it does. So: safe, felt, and not yet proven to change anything measurable in a healthy adult.
Not worth it if you want a cheap NAD+ bump: oral NMN or NR raises levels for a fraction of the cost, and plenty of people stay there. Not worth it for a specific mitochondrial complaint: SS-31 is the targeted tool and has human trials. If you have a heart rhythm problem or chest pain history, the flush reaction makes NAD+ a poor fit. It earns its place for the person over 40 who wants to feel the difference rather than read about it, and who will inject it slowly.
What people use it for
Energy and brain fog
Some evidenceNAD+ sits at the center of how cells make energy, and small human studies of NAD+ precursors show higher blood levels with modest improvements in markers like muscle function and blood pressure in older adults. Direct injection has small tolerability studies and heavy clinic use. The felt energy effect is consistent in user reports and not yet captured in a controlled trial.
Aging and DNA repair
Early daysNAD+ feeds the sirtuins and PARPs that repair DNA and regulate how cells age, and levels fall with age in every tissue studied. Restoring it extends healthspan in animals. In people the precursor trials are early and mixed, and no study has shown injected NAD+ slows aging by any measure.
Recovery from drinking and withdrawal
Early daysNAD+ infusion clinics built their reputation on alcohol and opioid withdrawal, and alcohol metabolism does burn through NAD+. The evidence is case series and clinic reports, not controlled trials. For the ordinary hangover, a slow 50 mg shot the next morning is what many users swear by; take that as a report, not a result.
Jet lag and sleep debt
Early daysNAD+ and the sirtuins tie into the body clock, which is the mechanistic reason travelers use it. User reports of faster adjustment are common; there is no human trial. If sleep itself is the problem, DSIP or Epitalon are the sleep-directed options.
How it works
- Used for energy, focus, and recovery
- A molecule your cells need to make energy
- Levels naturally drop with age
- Human evidence is growing but limited; infusions can feel intense
How people use it
Safety, in brief
Things people sometimes notice
- Flushing, chest tightness and a wave of nausea if you inject too fast; it passes in minutes and slowing down prevents it
- A warm, heavy feeling in the chest and arms during a dose
- Stinging and a sore spot at the injection site, worse when under-diluted
- Feeling wired in the evening if you dose late
The full picture — stop signs and who should talk to a doctor first — is on the dosing guide.
Sources
The labels and studies behind this page. Each link opens the original on PubMed, DailyMed or ClinicalTrials.gov.
- A Pilot Study Investigating Changes in the Human Plasma and Urine NAD+ Metabolome During a 6 Hour Intravenous Infusion of NAD
- Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD(+) in healthy middle-aged and older adults
- Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women
- NAD(+) metabolism and its roles in cellular processes during ageing