AMOUNTS RESEARCHERS USED
NAD+ dosage used in pill and IV research
These are amounts from published studies. Pills, drips, and shots stay in separate groups because the body handles them differently. None gives a plan for you.
What study amounts can and cannot tell you
A number on a bottle may look like a clear answer, and the amounts here only tell what researchers used. Most pill studies used NMN or NR because little whole NAD+ enters after swallowing. The body changes each smaller form into NAD+.
A pill amount cannot be matched directly with an IV amount. A pill passes through the gut, while an IV goes straight into the blood. Each result says whether people or animals were studied. Read every amount as a study fact, not advice for your care.
What each NAD+ amount was used to study
Human pill studies tested materials later changed to NAD+. NMN by mouth: studies used 250–900 mg/day, and some reached 1200 mg/day [1][3]. Researchers used 250 mg/day most often. One study compared 300/600/900 mg/day and rated the middle amount highest overall [3].
That 600 mg/day rating combined blood NAD+, walking, a test meant to estimate body age, and safety. It did not say the middle amount raised blood NAD+ most or was safest. NR by mouth: studies often used 250–1000 mg/day. Safety work reached 3000 mg/day [4].
NAD+ by IV: clinic reports used about 250–1000 mg in one visit. One study gave 3 micromoles, a lab count for a very small amount, each minute for six hours [10]. The figure describes drip speed and cannot set a pill amount.
Niacinamide: some studies used 500 mg twice daily. Niacinamide is a vitamin closely related to niacin, and those studies asked other health questions. They did not settle how much NAD+ would change or which amount works for you. Your doctor can weigh the findings with your health and medicine list.
What each form did to blood NAD+ over time
No single length of time fits every form. In a small IV study, blood lost nearly all the added NAD+ in the first two hours [10]. Whole NAD+ enters cells poorly. The IV rise was steep and short.
The blood response to pills took longer. Days or weeks passed before blood NAD+ climbed, and it stayed raised through 8–12 week studies [4][3]. NMN or NR pills caused that longer rise [10][4]. The blood change cannot tell you whether people felt better.
What side effects people had with NAD+ pills and drips
Side effects from NMN and NR pills were usually mild in these studies. At 100–1000 mg/day for eight weeks, NR caused no more problems than placebo, the pill with no NR [4]. Bad cholesterol stayed level. Safety work tested amounts up to 3000 mg/day [4].
NMN at 300–900 mg/day for 60 days caused no safety problem in that study [3]. A review of ten NMN studies found only mild problems. They happened as often with NMN as without it. No serious event was reported [15].
If an IV flows too quickly, a person may feel flushed or sick, with pain through the chest or stomach area. A pharmacy-mixed shot may also contain germs or their waste. One recall received the FDA's Class I label, its most serious group [11]. Pill labels do not assure that an outside lab checked the true amount or unwanted material.
What each way of taking NAD+ has shown
Most sound human studies used pills or powders of NMN, NR, or niacinamide [4][3][1]. IV drips have far less research, and much of it uses small groups or old notes [10]. Pharmacy-mixed shots placed just below the skin or in muscle also have little published work [11]. Forms used under the tongue, in the nose, on skin, or in patches lack sound proof.
How people took the substance is part of every finding. A pill amount and an IV amount do not mean the same thing. The body handles them in different ways. Return to the top of this dose page for why these study amounts are not personal advice.
What storage and bottle checks can change
NAD+ and NMN pull moisture from the air, while heat or dampness can spoil both [8][11]. A pharmacy must chill NAD+ shots and shield them from light. Poor storage may change how much a person receives.
NMN and NR pills may also vary in purity and true amount [8]. No rule assures an outside lab test for every bottle. A report tied to the bottle's lot is the clearest sign that a check occurred. Study pills are easier to judge because researchers know what they gave.
One NMN study compared 300, 600, and 900 mg/day. All three amounts put the blood NAD+ reading above placebo [3]. Researchers picked 600 mg/day after combining blood, walking, body-age, and safety results. They did not call it best on every test, and the rating cannot choose your amount.
What NAD+ study amounts cannot decide for you
This page gives no personal dose. Studies used NMN from 250–1200 mg/day and NR from 250–3000 mg/day by mouth. Researchers tested 250 mg/day of NMN most often [1]. One study gave 600 mg/day the best combined rating for blood, walking, body-age, and safety [3], but that rating cannot set your dose.