NAD+ isn't a peptide - it's a coenzyme central to cellular energy metabolism - but it lives on every peptide-clinic menu, so it belongs in this library. The core claim is real: NAD+ levels decline with age. Everything built on top of that fact - drips, shots, precursor supplements - runs far ahead of the human evidence, at prices that assume the conclusion.
The real science underneath
NAD+ (nicotinamide adenine dinucleotide) is required for hundreds of redox reactions and consumed by repair enzymes (PARPs, sirtuins). Tissue levels decline with age, and restoring NAD+ in aged animals improves multiple markers - genuinely interesting biology that made the field. The open question was never whether NAD+ matters; it's whether raising it in humans changes outcomes, and by which route.
Route reality: IV, injection, or precursor
| Route | What's known | Honest reading |
|---|---|---|
| IV NAD+ drips (250-1000 mg) | Raises blood NAD+; infusion reactions (nausea, chest pressure) force slow drips; outcome trials essentially absent | The most expensive route with the least outcome data |
| Subcutaneous/IM injections | Convenience version of the above; cellular uptake of intact extracellular NAD+ is debated - cells largely rebuild it from precursors anyway | Popular, unproven |
| Oral precursors (NR, NMN) | Reliably raise blood NAD+ in trials; human outcome results so far modest to null | The evidence-dense route - and the humbling one |
The precursor trials are the field's reality check: raising NAD+ is easy and repeatedly demonstrated; turning that into measurable human benefits (strength, metabolism, cognition) has mostly not worked yet at trial scale. Injections skip the cheap proven step and charge more for the unproven one.
The regulatory wrinkle
NMN got excluded from the US supplement pathway in 2022 after being studied as a drug candidate - the reason it vanished from mainstream shelves while NR (Niagen) remains. NAD+ itself for injection is compounding-pharmacy territory: legal when properly compounded under prescription, gray when sold as bulk 'research' vials. Clinic IV programs operate under medical supervision rules that vary by state.
What clinics charge vs what it is
NAD+ IV sessions typically run $300-800 and take two to four hours (the infusion reactions set the pace). Subcutaneous protocols run hundreds per month. Set against precursor supplements at $30-80/month that raise NAD+ demonstrably, the premium buys the ritual, the drip lounge, and the assumption that intact NAD+ delivery matters - an assumption the cell-biology literature actively debates.
Frequently asked questions
Do NAD+ injections actually work?
They raise blood NAD+ - that much is measurable. Whether that produces the marketed outcomes (energy, longevity, cognition) has not been demonstrated in controlled trials for any injectable route; even oral precursors, with far more studies, show mostly modest or null outcome results so far.
Why do NAD+ drips make people feel sick?
Rapid NAD+ infusion reliably causes nausea, flushing, and chest tightness - the reason drips run over hours. It's rate-dependent and fades when the drip slows; clinics treat it as routine, which it is, though 'routine discomfort' is worth pricing into a $500 session.
NAD+ vs NMN vs NR - what's the difference?
NAD+ is the target molecule; NMN and NR are oral precursors your cells convert into it. NR remains a legal US supplement; NMN was excluded from the supplement pathway in 2022; NAD+ itself is the injectable/IV form clinics sell. All three raise NAD+ levels; none has strong human outcome data yet.
How often do people get NAD+ injections?
Clinic protocols improvise - loading series then weekly or monthly maintenance is typical. No trial established any schedule, which is why protocols vary by clinic rather than by evidence.