Research by topic
NAD+ research: evidence, safety, and cost
A change in a blood marker is not the same as a change in memory, focus, or fatigue. Work through the evidence before comparing routes or choosing a provider.
Educational reading. These guides do not diagnose symptoms or replace medical care.
What the human evidence shows
Start here if your question is whether NAD+ can help thinking, brain fog, or fatigue.
NAD+, Brain Fog & Focus: What the Evidence Shows
NAD+ precursors raise blood NAD+, but do they actually lift brain fog or sharpen focus? An honest, fully-sourced look at what human trials really found.
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Does NAD+ Help Brain Fog? An Evidence Check
Does NAD+ actually lift brain fog? Honestly, little-to-no human evidence. What the trials found, why nasal/IV claims are unproven, and what to rule in first.
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NAD+ for Cognitive Energy & Fatigue: What the Evidence Shows
NAD+ precursors reliably raise the biomarker but haven't beaten placebo for fatigue or mental energy in the best trials. An honest, evidence-first review.
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NAD+ for Long-COVID Brain Fog: What's the Evidence?
The first randomized trial raised NAD+ but didn't improve cognition or fatigue. The honest evidence on NAD+ for long-COVID brain fog — and what to do instead.
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NMN & NR for Brain Health: What the Studies Actually Show
NMN and NR reliably raise NAD+ and look safe — but in the best human trials they haven't improved cognition. An honest, citation-first evidence review.
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Delivery routes and safety
Evidence does not transfer automatically between a capsule, a spray, an injection, and an infusion.
NAD+ Injection Side Effects: Safety Questions Before Treatment
FDA reports, sterile-compounding risks, and limits of NAD+ injection evidence. What to ask a prescriber and how to respond to concerning symptoms.
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NAD+ Nasal Spray: Does It Work for Focus?
NAD+ nasal spray is sold for focus and energy. No human trial has tested the route, it isn't FDA-approved, and here's what every NAD+ format costs.
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NAD+ IV for Mental Clarity: Is It Worth It?
NAD+ IV drips are marketed for mental clarity, but no rigorous trial tests them for cognition. An honest, evidence-first look at what the science shows.
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Liposomal NAD+ for the Brain: The Absorption Reality
Liposomal NAD+ is sold as a better-absorbed brain booster. Here's the honest absorption science — and why no human trial shows it helps cognition.
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NAD+ Dosing for Cognitive Benefits: What the Evidence Actually Supports
There's no established NAD+ dose proven to sharpen cognition. What dose-ranging trials actually show, and the honest limits behind every number.
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NAD+ vs Nootropics for Focus: An Honest Comparison
Neither NAD+ nor most nootropics have strong human focus evidence. An honest, evidence-tiered comparison — and the few things that modestly work.
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If you are comparing products or providers
Our provider and supplement reviews cover prices, what is included, and the practical trade-offs. You can also browse the full research library.
For published prices and delivery options, see NAD+ costs and the provider comparison.