What everyday health claims have shown
NAD+ findings leave questions about energy, weight, and safety
Clothes fitting tighter may make you pause over a pill's claims about weight. The answers here explain NAD+ findings, including what studies haven't shown about your health.
Pills changed blood NAD+ without proving more energy for daily life
If tiredness is slowing you down, a blood rise alone leaves the value of a pill unsettled. A pill marked “NAD” commonly holds NR or NMN, giving cells material for producing NAD+.
Trials giving these ingredients to people found blood NAD+ rises [3][4]. The trials didn't establish renewed energy or choose a treatment for your health.
NAD+ injections can break down before entering cells
A NAD injection or drip puts NAD+ itself into the body, while ingredient pills give cells material that can become NAD+. A pharmacy prepares these injections without FDA approval.
A small early drip study found much NAD+ breaking apart outside cells [13]. Almost none remained as NAD+ in blood liquid during the opening two hours, which doesn't prove useful delivery into cells.
Vitamin B3 helps make NAD, but NAD+ is not a vitamin
Your body uses B vitamins to make NAD+, though NAD+ itself isn't a vitamin. Niacin and nicotinamide are vitamin forms, while NR is another related ingredient.
Cells can also change NMN into NAD+ [5]. These ingredients provide starting material, rather than supplying the finished NAD+ the cells need.
NAD supports energy use, DNA repairs, and the response to harm
Your body needs NAD+ for both getting energy from meals and mending cells [5]. During repairs, proteins need NAD+ to mend DNA, where cells keep their instructions, and control inflammation, which can bring swelling in response to injury.
Your body makes NAD+ for these jobs. The need for NAD+ doesn't establish that extra supplies would improve your health.
NAD is made differently from peptides and proteins
NAD+ is neither a peptide nor a protein [5]. Peptides and proteins consist of chains of amino acids, small parts joined together with a make-up that differs from NAD+.
Their different make-up matters when you read treatment claims. A peptide's effects can't tell you what NAD+ would do.
NAD+ changes form while cells get energy from meals
The H in NADH means hydrogen, a substance found in water, that NAD+ picks up during energy work [5]. NAD+ and NADH change into each other as cells release energy; these are different forms, rather than two treatments for you.
A pill named NAD may supply starting material rather than medicine
Doctors use NAD to name the substance needed for cells to get energy and do repair work [5]. Pills bearing the name “NAD” may instead hold NR or NMN, which supply cells with material for producing NAD+.
The bottle name doesn't establish that the contents work as medicine. No disease treatment using NAD+ has been approved by the FDA [13].
NAD+ drips can cause sickness, and a tainted injection led to recall
Few serious unwanted effects were reported when people received NR or NMN pills in trials [3][4]. Few doesn't mean none; these reports don't give a count of the people affected.
Fast drips caused sickness, chest or stomach discomfort, and hot red skin. An injection containing bacterial poisons was recalled with the FDA's strongest warning, Class I [13].
Short daily-use studies leave safety over years unanswered
Studies giving NMN at 250 milligrams daily for up to 12 weeks reported few serious unwanted effects [1]. Separate NR studies reported few serious problems at their highest tested amounts, ranging from 1000-3000 milligrams daily [4].
These findings don't say that nobody felt sick, and the reports give no count of people affected. Your safety with years of use can't be settled by those brief trials.
Illnesses, medicines, and injection quality can change your risk
Reports from NR trials described few serious unwanted effects but gave no count of people affected [4]. These results don't establish that NR is safe for your illnesses or alongside your medicines.
Drips can cause sickness or pain, while poorly prepared injections may contain poisons from bacteria. One contaminated injection prompted the FDA's most serious recall warning, Class I [13].
NR and NMN blood rises do not prove that swallowed NAD+ helps
Little swallowed NAD+ reaches cells before breaking into smaller parts [6]. NR pills instead supplied material that cells could turn into NAD+, raising blood levels by up to 142% at 1000 milligrams daily [4].
An NMN trial found bigger blood rises with larger amounts over 60 days [3]. Those increases leave open whether you would notice a health gain from either pill ingredient [13].
Drip discomfort ended with treatment in one review of previous care
A review found that unwanted symptoms ended when NAD+ drips finished [13]. That concerns relief from drip discomfort, rather than when a hoped-for treatment benefit would begin.
Pill trials reported few unwanted effects [3]. After pills stopped, blood NAD+ fell toward the starting level over weeks; blood levels don't measure the length of unwanted symptoms for you [13].
Changes in walking and sugar tests leave weight loss unproved
Some trials found better muscle responses to insulin or farther walking in people [1][3]. Insulin controls blood sugar, and neither result proves that NAD+ treatment causes weight loss.
Rodents had better blood sugar control and less fat in their livers [6][13]. Those animal findings don't show that you would lose weight.
Higher blood NAD does not establish younger skin or reversed aging
NAD+ often declines as animals grow older, and people taking ingredient pills have had higher blood NAD+ [3][4]. Neither finding establishes that a person's skin looks younger or that aging reverses.
The stronger aging evidence comes from rodent studies [13][15]. A blood rise can't establish that you would look younger.
Egg findings improved in older mice, while benefits for women remain unproved
Older female mice given NMN had more NAD+ in egg cells and healthier eggs [9][10]. The mice released more eggs, and tests suggested more eggs remained in the ovaries, the organs holding eggs.
These findings concern animal reproduction, rather than men's strength or health. No human trial here has established that NMN improves a woman's chance of pregnancy.
NAD+ shot findings have not established worthwhile treatment
Shots and drips have fewer trials comparing treated and untreated people than pills do [13]. Most findings come from small early studies or reviews of care already given.
Those studies haven't established injections as a disease treatment. Whether a shot would give you enough benefit to be worthwhile remains unanswered.
Drips deliver NAD to blood without establishing better health
An early study of drips found NAD+ disappearing quickly from blood liquid while breaking down outside cells [13]. There are few trials comparing treated and untreated groups.
The direct delivery hasn't been shown to improve health. NAD+ reaching your blood doesn't prove that the drip will help you.
NAD+ shot studies have not chosen a best treatment time
Studies haven't established the best time to give a NAD+ shot. These pharmacy-prepared injections have no approval; reports describe drips and unwanted effects rather than a treatment time suited to you [13].
Your daily rhythm does not settle when ingredient pills work best
Your body's NAD+ production changes through the daily pattern of sleep and waking [5]. Trials haven't established whether NMN or NR pills work better in the morning or evening.
Patch benefits cannot be judged from swallowed-pill results
Patches and other treatments apart from pills or drips have few studies comparing treated and untreated people [6]. Most human results concern swallowed NMN or NR, which supply material cells use to produce NAD+ [4].
Results from swallowed pills can't establish that a patch helps you. The patch needs evidence from people who received that treatment.
Reported amounts leave the choice of treatment for you unsettled
NMN research gave 250-900 milligrams daily [3]. NR research gave 250-1000 milligrams daily, with amounts as high as 3000 milligrams daily tested for safety [4].
These are study amounts, rather than instructions for taking either ingredient. Your doctor can discuss how your current medicines and illnesses affect the choice of care.