Amounts tested, not advice for you
NAD+ dosage here means amounts used in studies
You’ll see what people received and how long each test ran. These figures can’t tell you what’s safe or useful for you.
Study amounts can’t set a personal dose
These are study figures. Each one tells you what researchers gave, how they gave it, and how long the test lasted. None can tell you what’s safe or useful for your health. Pill trials mainly studied NR and NMN. Cells can use either one to make NAD+. Plain NAD+ doesn’t pass well through your gut. No figure here is a personal dose. The result, the people tested, and the time all matter too.
NMN and NR studies tested many different amounts
Women with prediabetes received 250 milligrams a day of NMN for 10 weeks. Their muscles needed less insulin to pull sugar from blood. That small change didn’t show a cure for them or you [1]. Another 60-day test compared 300, 600, and 900 milligrams a day. Researchers favored 600 milligrams a day among those amounts [3]. A separate report lists about 1200 milligrams a day of NMN. The report ties no result to that amount, so the figure can’t guide you.
NR studies often use 250–1000 milligrams a day. One key trial used 100, 300, and 1000 milligrams a day for 8 weeks [4]. A safety test gave people with Parkinson’s disease up to 3000 milligrams a day. That test didn’t prove NR treats the disease. Separate work on skin cancer tested nicotinamide, a vitamin form, at 500 milligrams twice each day. Those tests used different groups and asked different questions.
IV reports describe about 250–1000 milligrams at one visit, with the drip running for hours. One study ran for 6 hours and used 3 micromoles per minute, which means the lab counted tiny bits of NAD+ rather than giving you a weight in milligrams for comparison. The report left out the weight, so you can’t compare the IV with pills. Don’t treat any amount above as advice for you.
Pills have more research in people than other forms
Pills and powders have most of the controlled work in people. Those tests used NMN, NR, and nicotinamide, a vitamin form [4][3][1]. IV NAD+ has only small studies and reports from old clinic notes. You can read them on the NAD injection and IV NAD+ page. Shots beneath the skin or placed in muscle have even less sound work. Sprays, skin patches, pills dissolved under the tongue, and nose sprays have barely been tested. Those claims come from sellers and clinics, not controlled trials.
The forms act differently. A small IV test found that unchanged NAD+ left sampled blood fast. Pills made from NR or NMN raised blood NAD+ over days or weeks. In 8–12 week trials, the rise lasted while people continued taking them [4]. That’s still a blood result, not proof of better health.
NAD+ side effects differ between pills and needles
Pill trials found few serious problems during the test periods. NR caused no flushing. From 100–1000 milligrams a day, NR and placebo groups had the same rate of side effects [4]. The placebo pills held no NR. IV NAD+ was harder on people. Small clinic reports tied fast drips to chest pressure, stomach pain, flushing, and nausea. Old clinic notes said the complaints cleared when the IV ended. No large trial confirmed that.
Shots bring a quality risk. The FDA placed one mixed NAD+ injection in Class I, its most serious recall group. Tests on the recalled shot found too much dangerous waste from bacteria. Cancer brings a different unknown. Fast-growing cancer cells also use NAD+. Reports don’t show when raising NAD+ might help or harm a person with cancer. If you’ve had cancer, that unanswered question matters.
Heat, damp air, and weak testing can spoil a product
Heat and damp air can spoil NAD+ and NMN. Product reports say a mixed NAD+ shot has to be kept cold and out of light after it’s made. Pills may not match their labels. Some makers show a test report from a lab they don’t own. Other makers show no report at all. Without a named lab and a report you can read, the bottle gives you no proof of what’s inside. These facts can’t tell you which brand is sound.