03. Amounts used in studies
NAD+ dosage shows what studies used, not your amount
You'll see how much people received and for how long. These figures aren't directions for you.
What the study amounts tell you
No NAD+ amount is approved for any illness. The figures below aren't directions for you.
They show what researchers gave people and for how long. That lets you read each result without guessing.
Instead of NAD+ itself, many study pills contained NMN or NR. Once swallowed, either ingredient can end up as NAD+ in your cells.
An IV tube puts NAD+ straight into your blood. The finished molecule doesn't remain there long.
A study amount can't account for your health, medicines, past care, and goals. A doctor who knows you can weigh those facts with you.
What amounts people received in studies
NMN is a pill ingredient made from a common vitamin. Studies gave people 250-900 mg/day, most often 250 mg/day.
One larger trial got its best result at 600 mg/day among groups taking 300-900 mg/day [3]. Researchers saw that only in this trial; the result doesn't set your amount.
Another study gave women 250 mg/day for 10 weeks. Their muscles pulled sugar from blood more easily [1].
NR is a similar pill ingredient. Studies often used 250-1000 mg/day.
Trials lasting eight weeks and six weeks both used 1000 mg/day [4][6]. Researchers also checked safety at 3000 mg/day.
That doesn't turn any amount into advice for you. IV NAD+ reports used about 250-1000 mg during one visit.
One study gave 750 mg over six hours [8]. That figure describes one group; it isn't your plan.
Why study pills use NMN or NR instead of NAD+
NAD+ itself doesn't pass through your gut or enter cells very well [14]. That's why pill studies usually use a smaller ingredient.
The two pill ingredients, NMN and NR, come from a vitamin. Your body uses both to make NAD+.
Inside you, NR changes to NMN. One more change makes NAD+ [5].
Those pill studies test NMN or NR. Swallowing the finished NAD+ molecule may affect you differently.
How long the NAD+ blood rise lasted
Once in a vein, NAD+ quickly splits apart. During one six-hour study, researchers couldn't find the finished NAD+ molecule in blood for roughly the first two hours [8].
Much of the dose had broken apart, and its pieces showed up in urine. The study found no lasting supply of the finished molecule in blood.
Pills changed blood more slowly. Tests took days or weeks to show more NAD+ after NMN or NR pills.
While people kept taking pills, the higher blood reading lasted six to twelve weeks [4][6]. That still doesn't prove a lasting health gain for you.
One NMN study checked people after they stopped. Blood NAD+ returned near its starting point in about four weeks.
How people took NAD+ changed the timing. After an IV, the finished molecule appeared late and left blood soon; with pills, the reading climbed more slowly.
What we know about each way NAD+ is used
Most studies with people used pills or powders. They held NMN, NR, or nicotinamide, another form of the same vitamin [3][4][6][7].
Wellness clinics also use IV NAD+. Proof for clinic drips comes from small tests and old records [8].
Shots may go beneath the skin or into a muscle. There isn't solid published proof of how your body handles these shots.
Sellers also offer nose sprays, skin products, and liquid placed under the tongue. Good studies in people haven't backed those forms.
NAD+ and NMN can break down in heat and damp air. Pharmacy mixing can also let in germs or the poison they leave behind.
The FDA gave one NAD+ shot its gravest recall after tests found too much germ poison. Read what happened with IV NAD+ for details.