What NR is
Nicotinamide riboside, or NR, is a form of vitamin B3. It is found in tiny amounts in milk, yeast, and some vegetables. In supplement form, it is sold under names like Niagen and Tru Niagen.
NR matters because of what it becomes. Your cells convert NR into NAD+, a molecule used to make energy, repair DNA, and run enzymes tied to aging. NAD+ levels fall as people get older. NR was developed as a convenient way to push them back up.
How NR raises NAD+
The body cannot absorb NAD+ well from a pill. It is too large and gets broken apart in the gut. NR is smaller and passes into cells more easily. Once inside, two enzyme steps turn it into NAD+.
A 2016 study in Nature Communications gave a single dose of NR to healthy adults and tracked blood NAD+. Levels rose within hours and peaked around eight hours later. A later study found that daily NR for six weeks raised NAD+ in blood cells by about 60 percent in middle-aged adults.
What the trials show
The human research on NR has a clear pattern. It is safe, and it raises NAD+. What it does beyond that is still being worked out.
A 2018 trial in Nature Communications gave 1,000 milligrams of NR a day to healthy adults aged 55 to 79 for six weeks. NAD+ went up. Blood pressure trended down in people who started with high readings, but the study was not big enough to prove that. A 2018 trial in older men in Cell Reports found NR raised NAD+ in muscle but did not improve muscle function or metabolism.
Small trials have looked at NR in heart failure, Parkinson's disease, and obesity. Results are early and mixed. A 2022 trial in Parkinson's found a small change in a brain scan marker, which is interesting but not a treatment. No trial has shown that NR extends life or prevents disease in people.
NR versus NMN versus NAD+ IV
NMN is a close cousin of NR with its own trials. The two have similar effects on blood NAD+. In 2022, the FDA said NMN could not be sold as a dietary supplement because it was being studied as a drug, so NR has been easier to find in stores.
An NAD+ IV skips the conversion step and puts NAD+ straight into the bloodstream. It gives a bigger, faster rise than any pill. Zen IV Spa offers an NAD+ IV from $399, an NAD+ shot for $175, and a self-injection program shipped to your home in New York and New Jersey after a free video visit. The compounded NAD+ used in these is not an FDA-approved drug, and these are wellness services rather than treatments.
Many people use both. A daily NR capsule keeps a steady baseline, and an IV every few weeks adds a bigger boost.
Dose and safety
Trials have used 250 to 2,000 milligrams a day. Most products suggest 300 to 1,000 milligrams. Side effects are rare and mild, mostly nausea or flushing at high doses. NR has a generally recognized as safe status with the FDA for use in foods and supplements.
Pregnant or breastfeeding women should avoid it because it has not been studied in them. Anyone being treated for cancer should ask their oncologist, since NAD+ is also fuel for fast-growing cells.
Is NR worth taking?
If you want to raise NAD+ with a well-studied, low-risk pill, NR is a reasonable choice. Be honest about what it can do. It will raise a lab marker. It may improve how you feel. It has not been proven to slow aging. Sleep, exercise, and a good diet still do more than any capsule.
Where to learn more
Visit /nad/ to compare NAD+ IV, shot, and self-injection options at Zen IV Spa. Call (332) 239-2005 or book a free video visit at zenivspa.zenoti.com.
Common Questions
Is NR the same as niacin?+
No. Both are forms of vitamin B3, but niacin can cause intense flushing and works through a different pathway. NR does not cause the niacin flush.
How long does NR take to work?+
Blood NAD+ rises within hours of a dose and reaches a steady level after about a week of daily use. Any effect on energy or sleep, if you notice one, usually shows up in the first few weeks.
Can I take NR with an NAD+ IV?+
Yes. They feed the same pathway. Tell the prescriber everything you take so the plan makes sense.
Does NR have side effects?+
Rarely. Nausea, flushing, or mild stomach upset at high doses have been reported. Trials up to 2,000 milligrams a day found no serious problems.
Is NR FDA approved?+
NR is a dietary supplement, so it is not approved to treat anything. The FDA has accepted it as generally safe for use in supplements.
Sources: Trammell et al., Nature Communications 2016 (NR pharmacokinetics); Martens et al., Nature Communications 2018 (NR in older adults); Dollerup et al., American Journal of Clinical Nutrition 2018 and Elhassan et al., Cell Reports 2019 (NR in older men); Brakedal et al., Cell Metabolism 2022 (NR in Parkinson's); FDA GRAS notice for nicotinamide riboside.
All treatments are medical services. Every guest is screened, and every treatment is prescribed by a licensed provider. Nothing on this page is medical advice for you personally, and the opinions summarized here belong to the doctors named, not to Zen IV Spa. Talk to a provider before starting or stopping anything.
