NAD+ injections: anti-aging miracle or overhyped wellness trend?

What did @fabulousfinley0 actually say?

The creator made three main arguments: IV NAD injections are unnecessary and damaging to veins, oral NAD precursors are "significantly more effective" than injections when comparing studies, and a specific supplement containing nicotinamide riboside (NR) and something called "urolithin A" is the smarter, cheaper alternative.

They framed this as an "industry shaker" for anti-aging, energy, and unspecified "health benefits," then linked to a third-party tested brand at 50% off. So this is, at its core, a supplement sales video dressed in science language. That doesn't automatically make the science wrong, but it's worth holding the claims to a higher standard because of that context.

One notable slip: the creator said "nicotinamide ribicide" instead of nicotinamide riboside. That's probably just a verbal stumble, not a red flag on its own.

Does the science back this up?

Partially. Oral NR does raise blood NAD levels, and that part is well-supported. The "significantly more effective than IV" claim is where things get shakier.

On the oral side, Trammell et al. (2016, Nature Communications) confirmed that oral NR supplementation raises whole-blood NAD+ and related metabolites in healthy adults. Martens et al. (2018, Nature Aging) showed NR raised NAD+ in older adults and reduced arterial stiffness markers. These are real, peer-reviewed findings.

On injections versus oral, the comparison is more complicated. IV NAD+ infusions deliver NAD directly into circulation, bypassing gut absorption entirely. There is no head-to-head randomized controlled trial directly comparing bioavailability of IV NAD versus oral NR in matched populations. The creator's claim that oral is "significantly more effective when comparing studies" is technically comparing apples and oranges across different study designs, not a controlled comparison. That's a meaningful overstatement.

The vein-scarring concern with IV use is legitimate, particularly with repeated infusions, but it is a safety consideration, not proof that oral absorption is superior in absolute terms.

What did they get wrong (or right)?

They got the basics right: oral NR does increase NAD levels, and routine IV infusions carry real risks that casual consumers often underestimate. Credit where it's due.

But the "significantly more effective" framing is a stretch the evidence doesn't fully support. Efficacy comparisons across different study populations, endpoints, and dosing protocols cannot reliably conclude one delivery method is categorically better. That kind of confident comparative claim needs a head-to-head trial to hold up, and that trial does not exist yet.

Urolithin A is the other ingredient mentioned. Research here is early but promising. Ryu et al. (2016, Nature Medicine) showed urolithin A improved muscle function and mitophagy in animal models. Singh et al. (2022, JAMA Network Open) found UA supplementation improved muscle strength and endurance in older adults in a randomized trial. So including UA in a longevity-adjacent supplement is not baseless, though calling it proven for humans is premature.

The anti-aging claim is the loosest part of this video. NAD research is active and genuinely interesting, but no oral supplement has been shown to reverse or meaningfully slow aging in humans. Associating NR with "anti-aging" as a direct outcome misleads consumers about where the science actually stands.

What should you actually know?

NAD+ declines with age, and that decline is associated with reduced cellular energy production and mitochondrial function. NR and NMN (nicotinamide mononucleotide) are the two most-studied oral precursors, and both have shown they can raise NAD levels in human blood. Raising NAD levels in blood is not the same as proven health outcomes, though. Most human trials are short-term, small, and not powered to detect meaningful clinical endpoints like disease prevention or lifespan extension.

IV NAD therapy is used in some clinical contexts, including addiction recovery settings, but the evidence base is limited and the practice carries real risks with repeated use. Dismissing it entirely as just "scarring your veins" oversimplifies a clinical picture that depends heavily on why someone is using it and under what supervision.

If you are considering any NAD-related supplement, look for products with published certificates of analysis from third-party labs, check that the NR dose matches what was used in published trials (typically 250-1000mg daily in research settings), and talk to a licensed provider before adding it to your routine. A supplement link in a TikTok description is not a substitute for that conversation.