The plain answer on NAD+
NAD+ rose in blood, but health gains aren't proved
You'll learn which blood readings rose, which health gains weren't shown, and why drips bring extra risk. Every number comes from a study named here.
What the pills changed in people
Some pills left more NAD+ in people's blood. That's the clearest finding.
The pills held NMN or NR, ingredients based on a common vitamin. Your body turns either ingredient into NAD+.
NAD+ is already inside you. It helps your cells handle energy from food.
Chemical words on a label can't tell you whether the bottle helps. First, you need to check whether the contents say NMN or NR.
That blood rise doesn't show that your health will improve, because the studies haven't shown that these pills prevent illness, ease a disease, or help people live longer afterward either. That's the honest limit.
What changed in blood, and what health didn't change
NAD+ sits inside every living cell. It helps each of your cells handle energy from food [5].
Samples from older bodies may hold less NAD+ [5]. Whether that matters to your health is still unknown.
One trial enrolled adults who were healthy apart from extra weight. They took NR, a pill ingredient made from a common vitamin.
Across the eight-week trial, NAD+ in blood rose 22% at 100 mg/day, 51% at 300 mg/day, and 142% at 1000 mg/day. The largest amount produced the largest rise.
Side effects weren't worse than with a placebo, or sugar pill [4]. Yet the study found no clear health gain.
A different trial tested NMN at 300-900 mg/day for 60 days. Blood NAD+ was higher on days 30 and 60 in every group [3].
Among the tested amounts, researchers favored 600 mg/day. That trial doesn't pick your amount.
A 2025 review found few studies that tested samples taken from people's bodies [14]. It found no solid proof of better health.
A blood test can't tell you whether you'll feel stronger. It can't prove you'll stay well longer or avoid illness.
What may be inside your NAD+ pill
Read past the large print. Your gut takes in almost none of NAD+ itself [14].
On a label, NAD+ means the finished molecule. NMN and NR are parts the body changes into NAD+.
Study capsules held either NMN or NR. After swallowing one, people made more NAD+ [5].
So "raised NAD+" may mean that people took one of those parts. Researchers then checked NAD+ in their blood.
An IV uses a tube to put NAD+ into a vein. See why IV NAD+ adds risk.
Your body handles each ingredient in a different way. The front label may blur that difference for you.
What NAD+ sellers can and can't claim
Sellers put NAD+ products in the supplement aisle. The government hasn't approved those products as treatments for illness.
There is no NAD+ medicine approved by the FDA for any disease. There also isn't an approved amount to take.
FDA rules can bar supplement sales when formal drug testing on an ingredient began first. The FDA says that rule applies to NMN.
That doesn't mean NMN is banned or illegal. Sellers and the FDA still disagree about which rule wins.
The dispute doesn't change what the trials found. Read the safety facts and sales rules for NAD+.
What to watch with pills, shots, and drips
Most research with people has used pills. NMN and NR weren't tied to major harm over weeks or months [4][6][7].
Good tests of IV NAD+ in people are rare. Blood soon loses the extra NAD+, and faster drips caused pain.
One pharmacy-made shot had the FDA's gravest recall. Tests found poison left by germs in the liquid.
Much of the other work used mice and cells studied outside a body. Those findings can't tell you how your body will react.
We matched each number to its paper. Start with human clinical trials or doses used in the research.
For short answers, use frequently asked questions about NAD+. The bottom line stays the same: blood results are stronger than health results.