NAD+
Also known as: NAD+ · Nicotinamide Adenine Dinucleotide
Technically a coenzyme rather than a peptide — central to energy metabolism, DNA repair, and sirtuin activity. Levels fall with age; injectable and IV protocols try to restore them.
Overview
NAD+ is in the catalogue because the longevity-clinic ecosystem adopted it, not because it is a peptide. It is a coenzyme, and the marketing sits well ahead of the human evidence. Cellular NAD+ does drop with age, sirtuins do depend on it, and the mechanistic case for restoring it is reasonable. The leap from 'cellular NAD+ matters' to 'a 500 mg IV infusion fixes aging' is not. IV protocols are anecdotal: many users report a clear energy and clarity bump on the day of infusion, but controlled trials are absent. Oral precursors (NR, NMN) have better-developed human pharmacokinetic and pilot data, but downstream clinical benefits remain modest.[1]
Evidence quality
Injectable and IV NAD+ have essentially no controlled trial data — the use case is built on mechanism plus anecdote. Oral precursors (NR and NMN) have a better-developed picture: published Phase 1 and 2 studies show they raise blood NAD+ levels reliably, but downstream clinical outcomes (physical function, biomarkers of aging) are mixed and small. The IV protocols popular in wellness clinics are pharmacologically interesting but not supported by trial-level evidence.
Benefits & timeline
Benefits
- Many users report a notable energy and mental clarity bump on the day of injection or infusion — subjective but consistent
- Supports sirtuin activity and DNA-repair pathways, which is the mechanistic case for the longevity framing
- Used adjunctively in addiction recovery clinics with reported reduction in withdrawal severity (anecdotal, popular in IV protocols)
- Mitochondrial function support — the coenzyme role is real even if the supplementation effect on aging is unproven
Timeline
Day 1
Most users feel an immediate, sometimes "buzzy" energy lift from the injection, peaking within hours.
Week 1–2
Cumulative energy improvement settles in. Sleep quality often shifts as well, occasionally for worse if dosed late.
Week 4–6
Plateau. If you are going to feel a sustained benefit, it has emerged by here.
Week 8–12
End of cycle. 4 weeks off lets you assess whether anything held without ongoing dosing.
Dosage protocols
Advanced
250 mg
three times weekly
IV infusion sometimes used at clinics; SC injection is the at-home form.
Beginner
50 mg
twice weekly
Standard
100 mg
twice weekly
Titration & adjustment
Inject SLOWLY — fast injection causes severe flushing and chest tightness. Start at 50 mg subcutaneously twice weekly. After 2 weeks escalate to 100 mg twice weekly. Maximum 250 mg three times weekly. If flushing occurs, dilute further (e.g. add 1 ml saline) and inject over 30+ seconds.
Injection timing
Subcutaneous, mornings preferred (the energy boost can disrupt evening sleep). INJECT SLOWLY (over 30–60 seconds) to avoid the flushing reaction. 2–3× weekly is the standard cadence.
Side effects & contraindications
- moderateFlushing and chest tightness during fast administration. This is the single most common complaint and it is genuinely uncomfortable. Inject slowly.
- mildNausea during or shortly after injection.
- mildInjection-site irritation, more common than with most peptides because of the volume and pH.
- mildSleep disturbance if dosed in the evening — NAD+ is energising for most users.
- moderateIV infusions at clinics carry the usual IV risks (line infection, infiltration) on top of the pharmacological ones.
Contraindications
- Active cancer — theoretical concern that NAD+ supports rapidly dividing tissue including tumour cells; the human data here is genuinely uncertain
- Pregnancy and breastfeeding
- Severe cardiovascular disease — the flushing response involves real vasodilation
- Concurrent niacin or nicotinamide supplementation — overlapping pathway, additive flushing
Reconstitution & injection
A 500 mg vial mixed with 5 ml bacteriostatic water gives 100 mg per ml. A 100 mg dose is 1 ml — too much for an insulin syringe, so use a 3 ml syringe with a 27–30 G needle. Subcutaneous, abdomen or thigh, twice weekly. Inject slowly, over 30–60 seconds at minimum. If flushing happens, dilute the next dose further (add another ml of saline) and slow the push. IV infusions are clinic-only and an entirely different protocol.
Open calculator pre-filledStorage after reconstitution
Refrigerate at 2–8 °C after reconstitution. Do not freeze. STRICTLY light-protected — NAD+ is photosensitive and will degrade visibly (the solution darkens) when left in light. Wrap the vial in foil or store in an opaque bag inside the fridge. Stable 28–30 days at fridge temperature when light is fully excluded; potency drops noticeably if exposed to ambient light for hours. A solution that has turned brown/amber should be discarded.
Cost & sourcing red flags
Typical price range: Compounding-pharmacy subcutaneous NAD+ runs $80-180 per 500 mg vial via a telehealth prescription, working out to roughly $5-15 per 100 mg dose. Clinic IV infusions cost $250-800 for a 500 mg drip and $800-1,500 for 1,000 mg, plus add-on charges for glutathione or B-complex. The IV markup over the raw material is the headline number to watch: a clinic charging $600 for 500 mg is selling a $100 vial plus a chair and a nurse.
Red flags
- IV clinics quoting $1,000-1,500 for 'rejuvenation' or 'detox' NAD+ drips without disclosing the actual NAD+ dose in milligrams. Pricing should track dose; a flat fee with no mg figure usually means a lower dose than the marketing implies.
- Subcutaneous NAD+ vials sold by research-peptide sites at $30-50 per 500 mg without a compounding-pharmacy prescription. NAD+ is unstable in solution and oxidises fast; cheap research-grade material with no pH or sterility documentation is a frequent source of injection-site reactions.
- Clinics or telehealth services pushing weekly 1,000 mg IV protocols indefinitely. The published human pharmacokinetic work (Grant 2019, Conlon 2024) shows large fractions of an IV bolus excreted unchanged in urine; chronic high-dose IV has no outcomes data supporting the schedule.
- Vials that arrive yellow or amber rather than the expected near-white powder, or that produce a yellow solution on reconstitution. NAD+ oxidises to NADP and degradation products; visible discolouration means meaningful potency loss.
- Compounding pharmacies that ship NAD+ injectable solutions unrefrigerated for multi-day delivery. Pharmacy-grade NAD+ for injection should ship cold; lyophilised powder is more forgiving but solutions are not.
- Any clinic or vendor selling 'NAD+ patches' or 'NAD+ nasal spray' at premium prices. There is no published bioavailability data supporting either route at the doses claimed on the label.
Pricing rots fast and varies by region and supplier. We list no vendors.
Common mistakes
Pushing the injection fast to get it over with.
Better approach: Fast push triggers the flushing reflex and produces real chest discomfort. Slow the injection to at least 30 seconds, longer if you are sensitive. If flushing happens anyway, dilute the next dose with extra saline.
Spending thousands on weekly IV infusions when oral NR or NMN would do most of the same job.
Better approach: Oral NR raises blood NAD+ reliably and at a fraction of the cost. The IV experience has the dramatic same-day buzz, but the cumulative biology is similar. Run NR for 8 weeks and see what you actually get before committing to an infusion habit.
Dosing in the evening.
Better approach: NAD+ is energising. Late dosing wrecks sleep onset for most users. Morning is the rule unless you have personally tested otherwise.
Treating it as the entire longevity stack.
Better approach: NAD+ is one input. Sleep, training, diet, and not smoking will outperform the most aggressive NAD+ protocol. If your sleep is broken, fix that first; NAD+ on top of broken sleep does very little.
Real-world tips
- Always inject slowly. The first session is the one where you learn your personal flushing threshold.
- Morning injection, with food. The buzz is real and unpleasant on an empty stomach for some users.
- If you flush despite slow injection, add 1 ml of bacteriostatic saline to the syringe to dilute and push over 60 seconds.
- Track sleep alongside energy. The energy bump can mask sleep degradation for a few weeks before the cumulative cost shows up.
- Consider running oral NMN or NR first. Cheaper, no needles, and the response tells you whether your NAD+ system is even what is limiting you.
What users report
Aggregated from r/longevity, r/Biohackers, and r/Nootropics threads plus telehealth-clinic review aggregates. Anecdotal, with strong selection bias toward people who paid four figures for IV courses.
Onset: IV users describe a felt change during the infusion itself: a wave of chest pressure, flushing and mild nausea that scales with drip rate, usually fading within an hour of the drip ending. Subcutaneous users typically describe an energy or mental-clarity shift over the first week of daily 50-100 mg doses, not an acute hit.
Common reports
- During IV: chest tightness 'like an elephant sitting on the sternum', flushing, and an urge to use the bathroom. Slowing the drip from 100 mg/h to 50 mg/h reliably reduces all three.
- Subcutaneous injection at 50-150 mg produces a localised burning or stinging at the site lasting 5-15 minutes, more pronounced than with most peptides because of the low-pH reconstitution.
- Mental clarity and reduced brain fog within 3-7 days of daily SubQ dosing, the single most commonly reported subjective effect on r/longevity.
- Mild headache and irritability in the first 2-3 days of a course, often described as 'methylation-related' though the mechanism is uncertain.
- Sleep changes split both directions: some users report deeper sleep within a week, others report insomnia if injecting in the evening and switch to morning dosing.
- Energy effect typically tapers after 2-4 weeks of continuous use, with users either pulsing (5 days on, 2 off) or cycling courses to maintain the felt effect.
Where reports diverge from theory: Clinic marketing promises systemic 'cellular rejuvenation' and lifespan benefit. The actual human data is much narrower: IV NAD+ raises blood NAD+ for hours, but tissue uptake of intact NAD+ is poorly characterised and most evidence suggests the molecule is broken down to NR, NMN and nicotinamide before crossing cell membranes. The felt effects users describe (clarity, energy, sleep change) are real and reproducible; the lifespan and senescence claims attached to them are not supported by the human PK and outcomes literature. The price differential between $30 per dose SubQ and $1,500 per IV session does not reflect a clinical-outcome gap; it reflects clinic overhead.
When something else is the better tool
Oral NR (nicotinamide riboside) or NMN
Use instead when: You want the same biology with better human evidence, no flushing, no needles, and a lower cost. The trade-off is no dramatic same-day buzz, which is honestly fine — the chronic effect is what matters.
IV NAD+ infusions at a clinic
Use instead when: You want the most aggressive plasma exposure and are happy paying for the experience and the monitoring. The use case is short (a single infusion before a high-stakes event) or remedial (addiction recovery). Long-term weekly IVs are expensive theatre.
MOTS-c
Use instead when: You want mitochondrial-level support with a more peptide-like protocol and a slightly better human evidence base for metabolic endpoints. The mechanism is upstream of where NAD+ acts and the use case is more training-adjacent.
Based on 1 peer-reviewed study
- Why does the injection feel so weird?
- NAD+ triggers vasodilation when delivered fast. The chest tightness, flushing, and 'crawling skin' sensation is the body responding to the bolus. Slow injection blunts most of it.
- Is IV really better than subcut?
- Plasma levels rise faster and higher with IV — that is real. Whether that translates to a bigger clinical effect is not established. Subcut at home gets most of the chronic exposure for a tenth of the cost.
- How is this different from taking niacin?
- Niacin is a precursor the body converts. NAD+ injection delivers the coenzyme directly. Niacin causes its own famous flushing through a different mechanism (prostaglandins). Both raise NAD+ levels via different paths.
- Does it actually slow aging?
- No human evidence that it does. There is evidence that NAD+ levels fall with age and that the coenzyme matters for processes implicated in aging. The leap from those facts to 'NAD+ supplementation extends lifespan in humans' is one the data has not made.
- Can I run it indefinitely?
- No long-term human safety data on chronic injectable use. Cycling 8–12 weeks on, 4 weeks off, is the conventional rhythm. Continuous dosing is genuinely unknown.
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