NAD+ for energy and mood: what TikTok skips over

What did @rachelokins actually say?

She made four core claims: NAD+ is in every cell, injecting it helps with "cellular turnover," it boosts energy without jitteriness, and it improves mood and mental clarity. She also said she injects it at home in the morning for an all-day energy effect. No dosing information was given, and she did include a standard disclaimer that this is not medical advice.

To her credit, she kept the claims relatively modest compared to some NAD+ content circulating on TikTok, which often veers into promises of anti-aging miracles. She did not claim it cures anything. But some of what she said is either imprecise or gets ahead of the evidence, and "I just pin it at home" deserves more scrutiny than a passing mention.

Does the science back this up?

Partially, and with significant caveats. NAD+ (nicotinamide adenine dinucleotide) is genuinely a coenzyme found in every cell, where it plays a central role in energy metabolism and DNA repair. That part is textbook biochemistry. The question is whether injecting supplemental NAD+ actually raises intracellular levels enough to matter clinically in healthy adults.

A 2023 randomized trial by Remie et al. published in Cell Reports Medicine found that NAD+ precursor supplementation raised blood NAD+ levels measurably, but the functional downstream effects, meaning actual improvements in energy or cognitive performance, were modest and inconsistent across participants. The IV and injection route does appear to raise plasma NAD+ faster than oral precursors like NMN or NR, but whether that translates into the subjective energy and mood effects people report is still an open question. Much of the supporting research comes from preclinical models or small, short-duration human trials.

What did they get wrong (or right)?

The claim that NAD+ helps with "cellular turnover" is imprecise language. What the research actually points to is NAD+'s role in sirtuin activation and PARP-mediated DNA repair, not turnover in the way the term is commonly understood. Turnover typically implies cell replacement, which is a different process. Small error, but worth flagging.

The claim that it gives energy "without making you jittery" is interesting because it is probably accurate for most people, but the mechanism is not stimulant-based, so comparing it to caffeine-style jitteriness is a bit of a false framing. NAD+ is not a stimulant. Whether it produces subjective energy improvements in healthy individuals with normal NAD+ levels is genuinely unclear. Most robust evidence comes from populations with NAD+ deficiency or metabolic disease (Yoshino et al., 2021, Science). The mood claim has even thinner evidence behind it in the injectable form specifically.

She got the "in every single cell" biology right. And the morning timing recommendation has a plausible rationale given NAD+'s role in circadian rhythm regulation, though direct evidence for optimal injection timing is lacking.

What should you actually know?

Self-injecting NAD+ at home, which she mentions casually, is not a trivial thing. Injectable NAD+ requires sterile technique, appropriate storage, and quality sourcing from a licensed compounding pharmacy. Improper preparation or administration carries real infection risk. This is not the same category as, say, B12 injections. Anyone considering at-home peptide or coenzyme injections should be doing so under supervision of a licensed provider who has reviewed their health history.

Additionally, NAD+ is not classified as a peptide. It is a coenzyme. The video is tagged under the peptide category and uses the hashtag "peptide," which is a common TikTok shorthand for biohacking injectables but is technically incorrect for NAD+. This matters because regulatory and safety considerations for peptides versus coenzymes differ.

The evidence base for NAD+ supplementation is genuinely growing and worth watching. Researchers like David Sinclair at Harvard have generated real interest in NAD+ biology. But "interesting research" and "proven intervention for healthy adults" are two different things, and that gap is worth keeping in mind before sourcing injectables online.

Our bottom line

This video is more responsible than most NAD+ content on TikTok. The creator included a disclaimer, did not make disease claims, and kept the language relatively grounded. But the casual mention of home injection, the imprecise "cellular turnover" framing, and the mood claims that outpace current evidence all needed more caution. If you are curious about NAD+, talk to a licensed provider who can assess whether your situation actually warrants it, not someone pinning at home for an Instagram-worthy morning routine.