What are the side effects of NAD+ IV therapy? The evidence is oral

NAD+ IV therapy side effects have not been catalogued in a trial of the infusion itself. The nearest thing to an answer is a systematic review that searched six research databases, pooled 10 randomised trials covering 489 people, and reached its conclusion about NADH taken by mouth [14].

Every one of those trials logged side effects. The most common were muscle pain, tiredness, disturbed sleep, headaches and complaints affecting the nervous system, which the review groups together without detail [14]. None of the adverse events it catalogued posed a serious risk to participants' health [14].

The people studied were patients. The trials covered chronic fatigue syndrome, Parkinson's disease, Alzheimer's disease, older adults, people carrying excess weight, and postmenopausal women with prediabetes, a state of raised blood sugar that has not yet become diabetes [14].

One randomised trial did put NAD+ into a vein. It gave 10 mg a day for seven days to 180 adults whose heart muscle had been weakened by blocked arteries, against a placebo drip of glucose and saline [6]. Over the next six months, serious events, meaning death from a heart cause, heart attack, stroke or an unplanned admission for heart failure, reached 14.6% in the infusion group and 24.7% on placebo, a gap small enough that chance is a reasonable explanation for it [6]. Harm did not go up. That is the strongest safety signal the infusion has, and it comes from a trial built to measure how hard a damaged heart pumps.

Route matters here. Swallowed NADH passes through the gut and the liver before any of it reaches the bloodstream, and an infusion skips both, so a tolerability record built on pills does not carry over to a drip. How much a clinic puts in the bag, and how often, is not what the heart trial tested either [6].

NAD+, short for nicotinamide adenine dinucleotide, is a molecule every cell uses to carry electrons through the reactions that release energy from food [10]. It does more than shuttle. It is also consumed as fuel by enzymes that repair DNA and switch genes on and off, among them the sirtuins, a family of proteins tied to how cells handle stress [10].

That is why a bag of it is not obviously inert. The same molecule feeds immune signalling: CD38, an enzyme sitting on the surface of immune cells, breaks NAD+ down, and its activity is one reason levels inside cells fall [10] [9]. Low NAD+ turns up alongside metabolic disease, inflammation, ageing and disorders of the nervous system [10].

Pushing those levels back up changes real biology, at least in animals. Mice given NAD+ building blocks after kidney injury had less of the inflammation that normally follows it [13]. Mice given nicotinamide riboside, one of the building blocks the body converts into NAD+, burned fuel differently and were partly protected against the effects of a high-fat diet [15].

None of that makes an infusion dangerous. It makes it a compound with real effects inside cells, which is the sort of thing whose side effects get measured rather than assumed.

The safety record is thinner than the confidence with which the service is sold.

This evidence does not apply to:

• healthy adults taking a drip for energy, hangovers or ageing, who appear nowhere in this research [14] [6]
• clinic infusion protocols, since the one intravenous trial used 10 mg a day for seven days, in hospital, on top of standard heart medication [6]
• repeated or long-term use, as follow-up stopped at six months [6]
• pregnancy, children and adolescents, none of whom appear among the groups the review covered [14]
• anyone reading the oral tolerability record as a description of the drip, since the review's conclusion is about NADH swallowed [14]

The heart trial reported what happened to its patients' hearts, not a breakdown of how they tolerated the infusions themselves [6]. Two of the mechanisms above come from mice [13] [15], and a mouse kidney is not a person's. The reviewers who pooled the human trials say plainly that the benefits, the conditions and the doses all need more work before anyone is confident [14].

Longevity clinics list NAD+ infusions beside vitamin drips, hormone panels and body composition scans, and a first appointment usually means an intake conversation, a cannula in the arm and a session sitting with the drip running. The honest answer a clinic can give about side effects is the one the research supports: trials of NADH by mouth logged muscle pain, tiredness, disturbed sleep and headaches, and none of them were serious [14], while the single intravenous trial tracked hearts rather than tolerability [6]. Anyone weighing the price is doing so without a published record of what the infusion does to people who are well.