What would you hope to feel?
Could more NAD+ make a difference you’d notice?
Pill researchers hoped replacing NAD+ lost with age would improve people's health. They tested ingredients the body could use to make more NAD+. Blood readings rose, but longer healthy lives haven't been shown.
What’s the main point before you read further?
Researchers hoped to help people stay well by replacing NAD+ lost with age. NAD+ is a substance already in your cells, where it helps with energy and repairs. The researchers gave pill ingredients called NMN and NR, which become NAD+ inside cells. Blood tests improved; the pills haven't been shown to lengthen people's lives.
Plain NAD+ capsules raise a different question about what reaches your blood. The NAD+ inside can break apart in your gut instead of passing into blood whole. A capsule dissolving in your stomach doesn't show that your blood received NAD+. I'd ask what people felt better able to do before paying for a pill or drip.
What work does NAD+ do inside your cells?
A review explains NAD+'s role as cells break food down [5]. NAD+ carries some of the energy released from sugar and fat. After passing that energy along, NAD+ can be used again. Knowing that cell work happens isn't proof a pill eases tiredness.
Your cells also contain proteins, substances that carry out jobs such as repairs [5][2]. Some repair DNA with NAD+; DNA holds the instructions for a cell's work. These repairs spend NAD+ rather than leave the supply ready for reuse. Inflammation, the body's defense after injury or against germs, also involves proteins using NAD+ [5][13].
Cells replace used NAD+ with ingredients from food or earlier use [5]. Reviews found less NAD+ during aging in humans and mice, and in worms and yeast [5][12]. Researchers hoped pills might replace some of that lost NAD+. Finding a loss doesn't prove replacing NAD+ would help you.
In most human trials, participants received the ingredients NMN or NR. The pills didn't give people the finished substance used inside cells. Ask your doctor what the researchers gave and what people could do afterward. Seeing NAD+ on a bottle doesn't answer either question.
Which NAD+ benefits did the human tests actually measure?
An NR trial ran for 8 weeks in overweight adults with otherwise good health [4]. Blood NAD+ rose 22% with 100 milligrams daily and 51% with 300 milligrams daily. Researchers found a 142% rise with 1000 milligrams daily. That short trial couldn't show whether people stayed well for years.
People taking NR didn't report hot, red skin, also called flushing. Some participants received a placebo pill, which didn't contain NR. Side effects were much alike with NR or the placebo. The trial can't settle your risks from years of use.
An NMN trial compared 300, 600 and 900 milligrams daily for 60 days. Blood NAD+ increased at days 30 and 60 in each NMN group [3]. During a timed test, people covered more ground; the added distance isn't given here. Researchers favored 600 milligrams daily after considering blood and walking results, without showing how much easier your walks might become.
A separate trial involved women near diabetes who were past menopause, giving 250 milligrams daily for 10 weeks [1]. Insulin is a hormone that sends messages between parts of the body. With insulin's help, the women's muscles drew more sugar out of blood; weight, fat, muscle size and the test averaging blood sugar across recent months stayed unchanged. The better muscle test hadn't led to better average sugar readings.
Amateur runners received 250 milligrams daily over 12 weeks [7]. Breathing tests on a treadmill suggested their muscles used oxygen better. The runners' results can't show whether you'd feel less tired at home. You can discuss the muscle findings and which pill was given with your doctor.
Why did aging mice lose some of their NAD+?
Your response hasn't been tested by an experiment involving mice. Researchers found a protein, a substance doing work inside cells, using up more NAD+ in aging mice [2]. Inflammation made that breakdown increase too. Removing the protein left older mice with more NAD+ and better energy use [2].
Reviews describe repair work using up NAD+ as well [5][13]. Aging human muscle also contained less of a protein that helps replace NAD+ [9]. Using more NAD+ while replacing less can reduce the supply inside cells. Exercise increased that replacement protein in human muscle [9].
Human blood NAD+ increased after participants took NR or NMN pills [4][3]. The trials didn't show whether illnesses later became less common. Ask your doctor whether anyone felt better or managed more in daily life. Studies involving people and questions about the findings can help you prepare.
What could you bring to an appointment about these products?
Start with the part of your day you'd like help with. Ask whether the study participants had trouble like yours. Amounts tested by researchers describe experiments without deciding your own treatment. What happens during a drip covers discomfort and questions about the pharmacy's liquid.
The pill comparison helps you tell which ingredient a claim concerns. Twenty-two common questions cover the findings and possible harms. Ask the clinic about the price and hours you'd spend there. Your regular doctor can compare the study's people and results with your own health before you spend money hoping for a change that wasn't measured in that particular trial.
Does selling a NAD+ product mean the FDA approved it?
A NAD+ product being sold doesn't mean the FDA approved the product as a drug. The supplements called NR and NMN supply materials that cells change into NAD+. Supplements haven't passed the drug checks showing that a treatment works. A review describes a dispute about whether shops could legally sell NMN as a supplement [12].
Pharmacy-made NAD+ shots and drips don't have FDA drug approval either. One faulty mixture is a reason to ask your clinic about safety. Medicine NAD explains research and offers no treatment or products. The numbered papers let your doctor check a claim against the research.