Short answer: NAD+ (nicotinamide adenine dinucleotide) is a coenzyme in every living cell, supporting cellular energy production, mitochondrial performance and the enzymes behind DNA repair. Levels decline with age, which is why restoring them became a major research area. Supporting healthy NAD+ levels may help support energy and cellular resilience.
NAD+ is the molecule your cells spend on everything — and one of the most talked-about in wellness for good reason. This page is the hub for everything we publish on NAD+, NMN, and NR: what the molecule does, why levels fall, and how the delivery formats stack up. If you've been hearing about NAD+ at the gym, on podcasts, or from your most energetic friend, here's the whole picture.
What NAD+ actually is
NAD+ is a coenzyme — a small helper molecule — present in every cell of your body. It cycles between two forms: NAD+ (the oxidized, "empty" form) and NADH (the reduced, "loaded" form). Together they act as an electron shuttle inside your mitochondria, the structures that convert food into ATP — the energy currency cells spend on everything they do. Think of NAD+ as the fleet of delivery trucks your cellular economy runs on.
That shuttle role is only half the story. NAD+ is also a consumed substrate — literally used up — by enzyme families involved in cellular housekeeping:
- Sirtuins (SIRT1–7), which regulate gene expression and stress responses
- PARPs, which consume NAD+ while repairing damaged DNA
- CD38, an enzyme whose activity rises with age and drains NAD+
So NAD+ sits at the crossroads of energy metabolism and cellular maintenance. That dual role is the entire reason it's interesting to aging research — and to anyone who wants their cells to keep up with their calendar.
Why NAD+ levels decline with age
Measured NAD+ levels in human tissue trend downward as we get older — one of the more robust findings in the field, observed across multiple tissue types [published human data]. Two things drive it:
- Production slows. Your body builds NAD+ from dietary precursors — niacin and nicotinamide (forms of vitamin B3), and tryptophan — and recycles it through the salvage pathway. Both become less efficient with age.
- Consumption rises. Enzymes like CD38 and PARPs consume more NAD+ in older tissue.
Declining NAD+ is associated with the reduced cellular energy capacity and slower repair that characterize aging tissue — which is exactly why researchers are actively studying whether restoring NAD+ levels supports how people feel and function as the years stack up. InstaMed frames its strip around supporting "healthy cellular energy production," "mitochondrial function and resilience," and "healthy aging pathways" [brand claim — unverified].
The delivery landscape: molecule size is the map
How you get NAD+ up matters, and the science here is genuinely interesting. Whether a molecule crosses a mucous membrane depends heavily on its size and charge:
| Molecule | Approx. size (Daltons) | Mucosal absorption profile |
|---|---|---|
| NAD+ (intact) | ~663 Da | Charged; the challenging case |
| NMN | ~334 Da | Borderline |
| NR | ~255–290 Da | Borderline |
| Niacin | ~123 Da | Absorbs well |
| Niacinamide | ~122 Da | Absorbs well |
The headline findings from this landscape:
Precursors work — and the human data proves it. NR and NMN are orally bioavailable, and multiple human trials show oral NR raises measured blood NAD+ — the landmark study being Trammell et al., Nature Communications (2016) [published human data]. Several NMN randomized trials at 250–900 mg/day report similar biomarker increases, and a 2026 head-to-head trial (Christen et al., Nature Metabolism) found both NMN and NR at 1,000 mg/day roughly doubled blood NAD+ [published human data]. The biomarker case for raising NAD+ is real and growing.
The regulatory story is loosening fast. NMN spent three years locked out of the supplement category after the FDA excluded it in November 2022. Then the agency reversed course — concluding in September 2025 that NMN was never lawfully excluded, and formally reinstating its dietary-ingredient status in December 2025 [published regulatory record]. The rules in this space are actively being re-examined, and the momentum is toward more legitimate access, not less.
Sublingual intact NAD+ has early data that's genuinely encouraging. A company-sponsored rat pharmacokinetic study of a sublingual NAD+ wafer (iX Biopharma's SL-NAD+) reported a two-fold rise in peak plasma NAD+ within ten minutes, and a small open-label human pilot (nine healthy adults) reported whole-blood NAD+ rising on average +59% at two weeks and +76% at six weeks [published company data — small, uncontrolled]. Early, uncontrolled, and sponsored — but it's exactly the kind of signal that explains why the sublingual NAD+ category is growing.
To be clear: we do not sell NMN or NR products. We cover them because an honest NAD+ hub can't skip the molecules with the best human data.
The honest context
Here's the passage that doesn't help us sell, kept anyway: the strongest published human evidence for raising NAD+ belongs to swallowed precursors (NR, NMN) — not to sublingual intact NAD+, which is what we sell. The iX Biopharma data is small, uncontrolled, and company-sponsored; no peer-reviewed human pharmacokinetic study exists for our specific strip, and in our own review of the published product data, its lot COA covers appearance, heavy metals, and microbials but no potency table — a gap we've flagged to the manufacturer rather than papered over. What the strip offers in exchange is real: needle-free, pre-measured, seconds-a-day convenience in a category whose other verified routes are pills you swallow or drips you schedule. If you want the product side, here's the Energy NAD+ sublingual strip — 100 mg NAD+ per strip, 30-count, orange flavor, $118 per 30-strip box.
IV NAD+: the clinical context
Before strips, the premium option was IV NAD+ at wellness clinics. Intravenous delivery sidesteps every absorption question — straight into the bloodstream — which is exactly why it's the expensive route: sessions run one to several hours, priced well into the hundreds of dollars, with clinic time and supervision attached. Reported experiences vary widely, and IV NAD+ is not an FDA-approved therapy for any condition.
Strips occupy the opposite end of the convenience spectrum: no needles, no appointments, no clinic pricing. Many users report choosing the strip simply because it's the version they'll actually take every day — and consistency is the whole game in a daily-support category.
For a complementary angle on cellular energy support, MOTS-c — a mitochondrial-derived peptide — is the active in our BOOST MOTS-c strips, now available at open checkout.
The bottom line
NAD+ is real chemistry doing real work in every cell you have, its age-related decline is one of the best-documented findings in the field, and raising levels is a live, fast-moving research area with human biomarker data behind it [published human data]. The strip is the most convenient, needle-free way anyone has ever offered to join that conversation — 100 mg per strip, 30 to a box, orange flavor, seconds a day. The precursor evidence is the strongest on the board and we say so ourselves; the strip's early data is encouraging and its convenience is unmatched. Many users report that the format they stick with is the one that fits the life they already live — and this one fits in a pocket.
---
Explore this cluster
The rest of the NAD+ file: precursors versus the direct molecule, format comparisons, timelines and safety.
- Do NAD+ Supplements Actually Work, or Is It Hype?
- NAD+ Four Ways: Strips vs IV vs Capsules vs Liposomal
- Sublingual vs Liposomal NMN: A Fair Comparison of Two Oral Routes
- How Fast Do NAD+ Strips Work? An Honest Timeline
- How to Use NAD+ Strips: When to Take Them, Hold Time, and Storage
- InstaMed NAD+ Strips: The Sublingual Longevity Option
- Does Sublingual NMN Work Better Than Capsules?
- NAD+ Side Effects: What Supplement and IV Users Report
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
This content is for educational purposes only and is not medical advice. Consult a licensed healthcare provider before starting any new product. Individual results vary.