NAD+ has been marketed as the closest thing to a brain reset on the wellness market, and that framing is doing a disservice to a molecule that does have legitimate clinical uses. I want to walk through what NAD+ actually does at the cellular level, what the evidence supports for cognitive function specifically, who I think benefits from a series of infusions, and who I steer away from it because they would get more value from spending the same money elsewhere.
The honest answer is that NAD+ is not a magic infusion and it is not snake oil. It sits in the middle. The patients who benefit most from it are not the ones the marketing targets — they are usually patients with a specific clinical picture where the underlying mechanism actually intersects with what NAD+ does in cells.
What NAD+ actually is and why it matters in the brain
NAD+ — nicotinamide adenine dinucleotide — is a coenzyme present in every cell. It exists in oxidized (NAD+) and reduced (NADH) forms, and the cellular ratio between the two is one of the most fundamental signals of metabolic state. NAD+ is required for three things that are particularly relevant to brain function.
First, mitochondrial energy production. The electron transport chain — the cellular machinery that produces ATP, the energy currency of the body — depends on NAD+ at every step. Neurons are exceptionally energy-demanding cells. The brain consumes roughly 20 percent of the body's resting energy despite being about 2 percent of body mass. When mitochondrial NAD+ is depleted, neuronal energy production declines, and the subjective experience of that decline is what many patients describe as brain fog — slow word-finding, harder to hold a complex thought, fatigue that does not respond to sleep.
Second, sirtuin activation. The sirtuin enzymes (particularly SIRT1 and SIRT3) require NAD+ as a cofactor. Sirtuins regulate cellular stress response, DNA repair, mitochondrial biogenesis, and inflammatory signaling. Their activity declines with age in part because intracellular NAD+ declines with age — by some estimates a 50 percent reduction between age 40 and age 60.
Third, PARP activity. PARP enzymes use NAD+ to repair single-strand DNA breaks. Chronic inflammation, oxidative stress, and toxic exposures (including chronic alcohol use) accelerate NAD+ consumption through PARP activation. Patients with high cumulative stress, sleep deprivation, or recovery from significant illness often have meaningfully depleted NAD+ pools.
The mechanistic case for IV NAD+ is that direct infusion bypasses the gut and elevates circulating NAD+ precursor availability, which the body then uses to restore intracellular NAD+ in tissues that need it. The clinical question is whether the magnitude of that effect is large enough to produce a noticeable subjective change, and in whom.
What the cognitive evidence actually supports
This is where the marketing and the data diverge. The strongest published evidence for NAD+ in cognitive function is in specific clinical contexts: post-acute illness recovery, particularly after viral infections that produce a post-illness fatigue and cognitive picture; substance use recovery, where NAD+ has a longer evidence base than the wellness market acknowledges; and certain neurodegenerative settings, where the data is suggestive but not yet conclusive.
For routine "I want to feel sharper" use in healthy patients with no underlying clinical picture, the evidence is much thinner. Many patients report subjective improvement after a series of infusions. Some of that is probably real — particularly in patients whose baseline NAD+ status was depleted by sleep deprivation, alcohol use, or chronic stress they had not been counting. Some of it is probably the comprehensive intake conversation, the two hours sitting still in a clinical setting, and the placebo effect that any high-touch wellness intervention produces.
I do not think that distinction makes NAD+ worthless. It makes it a tool with a specific indication. The patients I think benefit most are those with a clinical picture that points toward depleted cellular energy: post-COVID cognitive symptoms that have not resolved at six months, recovery from a defined high-stress period, recovery from a procedure or illness, or the specific pattern of brain fog plus fatigue plus poor recovery from exercise that does not have a clear hormonal or metabolic explanation on the lab panel.
What I look for before recommending an NAD+ series
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When a patient asks about NAD+ for cognitive function, I do the same thing I do with most wellness requests — I ask what they are actually trying to fix, and then I make sure the more common explanations have been ruled out before we spend money on infusions.
The brain fog and fatigue picture has a short list of more common causes that are missed often enough to be embarrassing: thyroid dysfunction (particularly low free T3 with normal TSH, which standard panels miss), iron deficiency without overt anemia (ferritin under 50 in symptomatic patients), B12 insufficiency in the low-normal range (under 400 pg/mL with elevated MMA), vitamin D deficiency, sleep architecture problems including unrecognized sleep apnea, hormonal decline (testosterone in men, estrogen and progesterone in perimenopausal women), and insulin resistance with associated cognitive symptoms. A comprehensive wellness assessment catches most of these.
If the lab work and history reveal a treatable underlying cause, I treat that first. A patient whose brain fog is from low free T3 will get more out of correcting their thyroid than they will out of an NAD+ series. A perimenopausal woman whose cognitive symptoms started alongside sleep disruption will get more out of hormone optimization than out of infusions. A patient whose insulin resistance is producing energy crashes and post-meal fog will get more out of a medical weight loss protocol that addresses the metabolic substrate. NAD+ in these patients is putting an expensive layer on top of an unaddressed foundation.
The patients I think are good NAD+ candidates are the ones who have already done the foundational work — labs are reasonable, hormones are addressed where indicated, sleep is reasonable — and still have a residual cognitive symptom picture that fits the depleted-mitochondrial-energy mechanism.
What an NAD+ infusion actually involves
The infusion itself is a slow drip. NAD+ at the doses used clinically (typically starting at 250 milligrams and titrating up to 500 to 1000 milligrams per session) is uncomfortable if infused too fast — patients describe chest tightness, flushing, nausea, and a general unwell feeling that resolves when the drip is slowed. A reasonable session takes two to four hours. We start slow, monitor tolerance, and titrate the drip rate up as the patient acclimates.
A typical course is four to six infusions over two to four weeks for the loading phase, followed by maintenance infusions every four to eight weeks if the patient is responding. Some protocols use lower-dose, shorter infusions delivered more frequently. The specific schedule gets matched to what the patient is trying to accomplish and how they tolerate the loading sessions.
I do not recommend high-dose NAD+ in patients with active malignancy, in pregnancy, in patients with significant cardiovascular disease without further evaluation, or in patients on certain medications where the interaction profile is unclear. The intake conversation covers all of this before any infusion is scheduled.
How this fits with the rest of an [IV hydration therapy](/services/iv-hydration) plan
Most of the IV work I do is not NAD+. It is more conventional infusions — a Myers-style cocktail for migraine, hangover, or pre-event support; targeted vitamin and mineral repletion in patients with documented deficiencies; high-dose vitamin C in select indications with appropriate G6PD screening; glutathione in specific protocols. These are tools with narrower, better-evidenced uses, and they are usually less expensive than an NAD+ series.
If a patient comes in asking about NAD+ and the conversation reveals that what they really want is just to feel better and have more energy, sometimes the right answer is a Myers cocktail with appropriate B-complex repletion, fixing their sleep, and addressing whatever the labs reveal. The NAD+ series stays available for the patients who actually fit the indication.
A practical next step
If you have been considering NAD+ for cognitive function, the most useful thing I can offer is the workup conversation before the infusion conversation. Bring whatever recent labs you have — particularly thyroid (TSH, free T3, free T4), ferritin, B12, vitamin D, and sex hormones if you have them. If those have not been checked, I will order them at the first visit. Patients in Columbus and the surrounding area, including the patients I see from Warner Robins and Fort Benning who come in for IV work, do best when we take the workup seriously first. The Columbus IV clinic and Warner Robins IV clinic both run NAD+ protocols when indicated. If after the workup it makes sense to move forward with an NAD+ series, we will schedule an infusion and start the loading phase. If a different intervention will produce a better result for less money, I will tell you that instead.
Medical disclaimer: This article is for educational purposes only and does not constitute medical advice. Individual clinical decisions should be made in consultation with a qualified healthcare provider following appropriate evaluation. References to specific treatments, dosing, or protocols are informational.
Travis spent 17+ years in high-acuity clinical medicine — emergency, cardiac ICU, and cath lab — before founding Revitalize. He is a Certified Platinum Biote hormone therapy provider, the published author of You're Not Broken — You're Unbalanced, and the founder of the Rebuild Metabolic Health Institute. His clinical writing reflects the same precision he brought to critical care: specific, honest, and built around what actually works.
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