Shots and IV drips / not approved
What an NAD+ injection changes—and what it hasn't proved
Small studies checked how fast NAD+ left blood and how people felt. The products aren't approved, and one was recalled.
What blood tests and a recall showed
One small study sampled blood during an NAD+ drip. The body broke NAD+ apart fast, leaving little whole NAD+ in early samples. Another report found more pain and stomach trouble when the drip ran faster. A pharmacy-mixed shot was also recalled after tests found poison made by bacteria. If you asked me across the table, I'd begin with those limits before you listened to any clinic promise about your energy, your aging, or how the drip might make you feel. NAD+ can enter a vein, go beneath the skin, or reach muscle through a needle. Pharmacies mix these products for one person, but none has FDA approval.
You can't get the same firm answer from shot studies.
What an NAD+ shot or drip contains
An NAD+ shot may run through a tube in a vein, go beneath your skin, or enter a muscle. The vein drip is most common. A pharmacy usually mixes these products for one person. That's called compounding. They aren't FDA-approved drugs.
Human testing of IV NAD+ is weaker than pill testing. Testing of shots into skin or muscle is thinner still. Almost no published work shows where the NAD+ goes in your body. The firmer findings belong to the pill ingredients known as NMN and NR [3][4]. A clinic can offer a shot before sound studies can tell you what to expect.
How fast injected NAD+ leaves your blood
The most useful blood study followed an NAD+ drip over time. Healthy men received 750 mg over 6 hours. Blood tests couldn't find whole NAD+ for about the first 2 hours. It rose only near the end. Broken-down parts of NAD+ rose in urine at the same time [6].
Your body breaks IV NAD+ apart fast. Much of it becomes other parts instead of staying whole in blood. The study doesn't show whether those parts help or harm you. It does make broad claims about a shot harder to trust. The study amounts for NAD+ ran over hours; the medicine wasn't given quickly through the vein. That small early study can't predict your blood result.
What changed for people in small drip studies
The studies are small, but they did report results. One gave five daily IV drips at 750 mg/day. People improved on 6 of 8 thinking tests, compared with 2 of 8 after salt water [9].
Another study followed 50 people whose drug-use illness had resisted care. IV NAD+ was paired with a drug that helps natural brain chemicals last longer. Craving, worry, and low mood fell. The authors judged those drops unlikely to be a fluke, but the study lacked a fair comparison group. Halfway through care, 100% of urine samples from a 40-patient group were free of illegal drugs [7].
A review reached back to a 1961 report of 104+ cases. That report used 500-1000 mg each day for 4 days, then more doses later. The review still said IV NAD+ isn't FDA-approved and called for fair trials [8]. These reports don't confirm that the care works.
What can go wrong with compounded NAD+
A compounded NAD+ shot brings risks you don't get from every pill. Compounded means a pharmacy mixed it for one person. The FDA put one product under its gravest recall warning when tests detected an unsafe amount of poison made by bacteria. That warning means the product could badly harm someone [14].
Strength and purity may differ from one batch to another. Outside testing isn't assured. After NAD+ powder is mixed with liquid, it pulls in water and may break down. The shot must stay cold and out of the light. These facts don't make the shot approved. They show why you need clear answers about the pharmacy and storage.
What happens when NAD+ is given by needle
A clinic may give NAD+ through a vein drip or place a needle in your skin or muscle. The product is compounded and isn't an FDA-approved medicine. Few fair human tests exist. One blood study found that people cleared IV NAD+ fast instead of keeping it whole [6]. You can't know your result from that one study.
What studies can't tell you about an NAD+ shot
Fair tests of NAD+ shots are weak. Small studies reported changes in thinking and drug-use illness [7][9]. Reviews still say IV NAD+ isn't approved and call for fair trials with comparison groups [8]. The current work can't tell you whether a shot is worth your money or likely to help you.