NAD+ and energy: what the actual research says vs. TikTok hype

What did @henrylifts actually say?

@henrylifts claims that NAD+ is a molecule in every cell whose "main function is to produce energy," that declining NAD+ with age hurts recovery and mental clarity, and that supplementing fixes this. He also describes sleeping "for about a day" after his first dose because he "flooded" his system with "all this new energy" that had "nowhere to go." That last part deserves real scrutiny.

To his credit, the core framing, that NAD+ is a coenzyme involved in cellular energy metabolism and that levels decline with age, is not wrong. But the explanation for his sleepiness is entirely invented physiology, and the implied certainty that oral NAD+ supplementation meaningfully raises cellular NAD+ levels is a much harder sell than he makes it sound.

Does the science back this up?

The biology of NAD+ is real and well-documented. The problem is that the supplement version of this story is running ahead of the evidence.

NAD+ (nicotinamide adenine dinucleotide) is genuinely indispensable to redox reactions in glycolysis and the Krebs cycle. Age-related NAD+ decline is documented in human tissue, with Camacho-Pereira et al. (2016, Cell Metabolism) showing that a key NAD+-consuming enzyme, CD38, becomes more active with age and degrades NAD+ faster. Yoshino et al. (2021, Science) found that oral NMN, a NAD+ precursor, raised blood NAD+ metabolite levels in postmenopausal women with prediabetes. But raising blood levels and actually raising intracellular NAD+ in muscle or brain tissue in healthy people are not the same thing. Studies on direct oral NAD+ supplementation are thinner, and bioavailability is a genuine open question because NAD+ is poorly absorbed intact through the gut.

What did they get wrong (or right)?

Credit where it is due: NAD+ declining with age is accurate. The connection to energy metabolism is accurate at a biochemical level. Recovery and cognitive function being linked to cellular energy status is reasonable to say.

What he got wrong is more specific. His explanation that sleepiness occurred because new energy had "nowhere to go" is not a real physiological mechanism. There is no documented phenomenon of excess NAD+ causing sedation by overflow. Fatigue after beginning NAD+ or NMN protocols has been anecdotally reported, but the proposed mechanism, excess energy causing sleep, is not supported by any published research. He is retrofitting a story onto a symptom.

He also implies that oral NAD+ supplementation is straightforwardly effective at raising cellular NAD+. Trammell et al. (2016, Nature Communications) showed that oral NR raised blood NAD+ metabolites, but evidence that oral NAD+ itself (rather than precursors like NMN or NR) has the same effect in humans is limited. The distinction matters.

What should you actually know?

If you are interested in NAD+ support, the supplement research is actually stronger for precursors like nicotinamide riboside (NR) and NMN than for NAD+ itself taken orally. Conze et al. (2019, Scientific Reports) found NR was safe and raised whole-blood NAD+ in a clinical study. That is meaningful. It does not mean the energy or recovery benefits are guaranteed in healthy adults, but the pathway at least makes pharmacological sense.

The "I can't go without it" framing is a psychological dependency red flag, not a physiological one. NAD+ precursors are not known to cause physical dependence. Anyone experiencing dramatic effects from stopping a supplement should consider whether expectation is doing a lot of the work. Telehealth providers who work with NAD+ therapies will typically use IV administration precisely because oral bioavailability questions are unresolved. If you are considering this, that conversation belongs with a licensed clinician, not a TikTok caption.