INJECTABLE LENS / COMPOUNDED · UNAPPROVED
NAD Injection: What the Research Shows About Injectable NAD+
Injectable NAD+ is a compounded, unapproved wellness therapy with the weakest controlled evidence and documented quality risks. Here is what the pilot and retrospective data actually measured.
The short version
A NAD injection delivers NAD+ (the cell's energy-handling helper molecule) by needle — into a vein as a drip, or under the skin or into muscle — instead of by mouth. Unlike oral precursors (NMN and NR, the building blocks the body turns into NAD+), injected and IV NAD+ are compounded and not FDA-approved, and the controlled evidence is thin. Two facts anchor this page: infused NAD+ is cleared from the blood within hours, and a compounded injectable NAD+ product has been recalled for contamination. Everything below is research description, not a recommendation.
What an injectable NAD+ product actually is
Injectable NAD+ covers IV infusion (the common form) and subcutaneous or intramuscular injection (compounded, less studied). The defining regulatory facts: injectable NAD+ is not an FDA-approved drug, it is typically compounded, and IV NAD+ has the weakest controlled evidence of any NAD+ route. Subcutaneous and intramuscular NAD+ injection in particular have minimal peer-reviewed pharmacokinetic data — the route is marketed well ahead of its evidence. By contrast, the bulk of controlled human NAD+ data comes from oral precursors, not injections [3][4]. This page reads the injectable record on its own terms and flags where it runs out.
Pharmacokinetics: injected NAD+ does not linger as NAD+
The single most useful fact about an NAD injection is that the NAD+ does not stay in the blood as NAD+. A pharmacokinetic pilot infusing 750 mg over 6 hours found plasma NAD+ undetectable for roughly the first 2 hours, rising only in the final hours, while urinary methylated nicotinamide metabolites climbed — direct evidence of extensive extracellular metabolism and rapid clearance [6]. So the body processes injected NAD+ quickly into downstream metabolites rather than holding a pool of intact NAD+. That clearance profile is the central caveat behind every efficacy claim made for the injectable route, and the reason the doses used in NAD+ research for IV protocols run over hours rather than as a single bolus.
What the injectable studies have reported
The injectable evidence is small-n and preliminary, but it exists. A pilot of five consecutive daily IV infusions at 750 mg/day reported improvement on 6 of 8 neuropsychological tests versus 2 of 8 for saline control [9]. In 50 treatment-resistant substance-use-disorder patients, IV NAD+ paired with enkephalinase inhibition was associated with statistically significant reductions in craving (p = 1.06e-9), anxiety (p = 5.49e-7), and depression (p = 1.76e-4), and 100% of urine samples in a 40-patient subset tested negative for illicit substances midway through treatment [7]. A narrative review documents historical IV NAD+ use in addiction — including a 1961 series of 104+ cases using 500-1000 mg IV NAD+ daily for 4 days then maintenance — while stating plainly that IV NAD+ remains unapproved by the FDA and that rigorous randomized trials are needed [8]. These are signals from pilots and case series, not confirmation from controlled trials.
Documented quality risks of compounded injectables
Compounded injectable NAD+ carries quality risks that oral precursors do not. The most concrete: the FDA has issued a Class I recall of a compounded NAD+ injection for elevated bacterial endotoxin — a Class I recall is the agency's most serious category, reserved for products that could cause serious harm [14]. Compounded products also vary in purity and actual content, and third-party testing is not guaranteed. Reconstituted injectable NAD+ is hygroscopic and should be kept cold and protected from light. None of this makes injectable NAD+ an approved therapy; it remains a compounded, unapproved wellness product, and these are the documented reasons the quality bar matters.
What is an NAD injection?
An NAD injection delivers NAD+ by IV infusion or by subcutaneous/intramuscular injection in wellness settings. It is a compounded, unapproved therapy with limited controlled evidence, and infused NAD+ is rapidly cleared from plasma rather than persisting as intact NAD+ [6]. It is not an FDA-approved medicine.
Is NAD+ shot worth it?
Controlled evidence for an injectable NAD+ shot is weak. Small pilot and retrospective studies report cognitive and addiction-related findings [7][9], but reviews note IV NAD+ remains unapproved and call for rigorous randomized trials [8]. This digest reports what was measured; it does not assess whether any product is worth purchasing.