Cell energy
Your cells' master energy currency and anti-aging powerhouse—NAD+ keeps your mitochondria humming, activates longevity genes called sirtuins, and helps repair DNA damage that accumulates as you get older.
Start here
NAD+ is not a peptide but a coenzyme — a helper molecule that enzymes in every living cell need to turn food into energy. Levels fall sharply with age — by middle age you may have half what you had in youth — and restoring them is being studied for cellular energy, brain health, and healthy aging. People raise NAD+ with oral precursors (NR or NMN), IV infusions, or injections. It has moderate human trial evidence (Phase 1-2) and is not FDA approved.
Think of NAD+ as the fuel that powers thousands of reactions inside your cells every second. It's like the electricity that keeps all your cellular machinery running. Your mitochondria—the tiny power plants in every cell—need NAD+ to convert food into usable energy. NAD+ also activates special proteins called sirtuins that act like cellular repair crews, fixing DNA damage and keeping cells healthy. The problem? Your NAD+ levels drop dramatically as you age—by middle age, you might have half what you had in your youth. Boosting NAD+ with precursors or infusions helps restore youthful cellular function.
NAD+ (nicotinamide adenine dinucleotide) is a helper molecule found in every living cell. It carries electrons (tiny charged particles) back and forth during the chemical reactions that turn food into energy. It comes in two forms, NAD+ and NADH, and switches between them during glycolysis (the first step of breaking down sugar), the citric acid cycle (a loop of energy-making reactions), and oxidative phosphorylation (the final step, where cells make most of their energy). Beyond energy, NAD+ is fuel for three major groups of enzymes: sirtuins (SIRT1-7), which control gene activity, DNA repair, and metabolic balance; PARPs (poly(ADP-ribose) polymerases), which are essential for repairing damaged DNA; and CD38/CD157, enzymes on the cell surface that help control calcium signaling. NAD+ declines with age for three reasons: CD38 becomes more active, the body makes less of it, and PARPs use up more of it because DNA damage has built up. NAD+ precursors (NR and NMN, which the body turns into NAD+) restore levels through the salvage pathway (the body's recycling route): enzymes called nicotinamide riboside kinases convert NR to NMN, and NMNAT enzymes then convert NMN to NAD+. This restoration activates SIRT1, which removes chemical tags (deacetylation) from PGC-1α (a master switch for building new mitochondria (the power plants inside your cells)), boosting the growth of new mitochondria (your cells' energy engines) and the cells' energy use.
Evidence check
Some human studies
It has been tested in people, but only in small or early-stage studies. Promising, but not yet proven the way an approved medicine is.
Every numbered marker on this page links to one of the 7 sources at the bottom.
Cellular Energy
NAD+ is a cofactor for the enzymes that regulate cellular metabolism, DNA repair and immune function. Whether raising it changes how a healthy person feels or performs has not been reported in a published trial.
Longevity Support
A 2025 review of NAD+ precursor supplementation in human ageing sets out both the clinical evidence and its limits. No published trial reports a lifespan or ageing outcome in people.
Brain Function
Oral nicotinamide riboside has been tested in a double-blind trial in Parkinson's disease and in older adults with peripheral artery disease, where vascular and cognitive measures were assessed. No published trial reports a cognitive outcome for IV NAD+.
The most-asked question
The research-reported range is 500 mg, once daily. Studies used different doses for different situations — find yours:
Baseline NAD+ support
250 mg NR or NMN (nicotinamide riboside or nicotinamide mononucleotide, two vitamin B3 forms)
Lower end of trial-validated oral precursor dosing; NMN 250-900 mg/day and NR from 250 mg/day raise blood NAD+ 16.
Sustained NAD+ elevation
500 mg NR or NMN (nicotinamide riboside or nicotinamide mononucleotide, two vitamin B3 forms)
500 mg twice daily NR raised PBMC NAD+ ~60% in a randomized placebo-controlled trial in older adults 14.
Direct NAD+ repletion (clinic-administered)
500 mg NAD+ in 500 mL saline
Source class: clinical practice. The milligrams alone do not describe this dose; the published studies also state how fast it went in. In the tolerability study, all 6 people (6 of 6, 100%) receiving 500 mg reported moderate to severe abdominal cramping, diarrhoea, nausea, vomiting, increased heart rate, throat pain, congestion and chest pressure during infusion, against 5 of 8 reporting minor tingling and mild cramping on nicotinamide riboside. Participants set their own rate by tolerance; average total infusion time was 97 minutes for NAD+ and 37 minutes for NR 6. A separate study infused NAD+ at 3 micromoles per minute over 6 hours 7. Three hours after infusion, blood NAD+ was significantly higher in the NR group than the NAD+ group 6.
The ceiling: Oral: Up to 2000 mg daily has been studied safely; IV: Typically 250-750 mg per session under medical supervision
Reconstitution, in plain words
Peptides usually arrive as a freeze-dried powder in a small vial. “Reconstitution” just means adding sterile water back in so you can measure a dose. Here's how it works for NAD+:
For IV infusion: A typical 250mg vial mixed with 250mL saline creates a 1mg/mL solution. The entire bag is then infused slowly over 2-4 hours to minimize flushing.
IV infusions are typically prepared by medical professionals. For oral supplements, simply take the capsule or powder as directed—no mixing required.
Three quick questions — your vial, your water, your dose — and it tells you the exact syringe mark. “Find dose amount” is preloaded with NAD+'s recorded schedule.
Injection sites & technique
Mostly given as a drip into a vein (IV infusion) for direct NAD+; injections under the skin or into a muscle are less common but sometimes used
Timing
Morning is generally recommended for oral NAD+ precursors since they can boost energy and alertness. Some people find afternoon doses interfere with sleep. IV infusions can be done anytime but plan for 2-4 hours.
NAD+ precursors can be taken with or without food. Some people find taking with food reduces any digestive upset. Fat-soluble companions like resveratrol absorb better with a meal containing healthy fats.
NAD+ precursors pair well with sirtuin activators (compounds that switch on longevity-linked proteins) like resveratrol and quercetin—they work together. CoQ10 and PQQ support the same cell energy pathways. Space supplements 30 minutes apart if taking multiple.
The honest list
These show up most often. They usually fade as your body adjusts.
A warm, red feeling on your skin—especially face, neck, and chest. This is similar to niacin flush and happens because NAD+ affects blood vessel dilation. More common with IV infusions.
What to do Start with lower doses and increase gradually. For IV, slower infusion rates dramatically reduce flushing. Taking with food may help. An antihistamine beforehand can reduce intensity.
Mild nausea, stomach discomfort, or loose stools when first starting NAD+ supplements. Your gut is adjusting to the new compound.
What to do Take with food to buffer your stomach. Start with a lower dose and work up over 1-2 weeks. Most people find this resolves within the first week.
Some people experience headaches when starting NAD+ supplementation. This may relate to changes in cellular metabolism or blood flow.
What to do Stay well-hydrated—dehydration worsens headaches. Usually resolves within the first few days. If persistent, try reducing your dose.
Worth knowing about, but most people never see these.
NAD+ boosts cellular energy production, which some people feel as jitteriness or difficulty winding down, especially if taken too late in the day.
What to do Take your dose in the morning rather than afternoon or evening. Consider reducing the dose if stimulation feels excessive.
Some users report more vivid or memorable dreams when taking NAD+ supplements, possibly related to changes in brain cell energy metabolism during sleep.
What to do Generally not problematic. If dreams become disturbing, try taking your supplement earlier in the day or reducing the dose.
Rare, but if any of these happen, stop and contact a medical professional.
Some people experience chest pressure or tightness during IV NAD+ infusions, usually when the infusion rate is too fast. This typically resolves when the rate is slowed.
What to do STOP or slow the infusion immediately and notify your healthcare provider. This is why IV NAD+ should only be given under medical supervision.
Week by week
Is it right for you?
NAD+ supplements and infusions are not FDA-approved for treating any medical condition. The information provided is for educational purposes only. Always consult with a qualified healthcare provider before starting, stopping, or changing any supplement regimen.
Theoretical concern that boosting cellular energy could benefit cancer cells. Always consult your oncologist before using NAD+ during cancer treatment.
NAD+ can affect blood vessel function. Monitor blood pressure and work with your doctor if you're on blood pressure drugs (antihypertensives).
NAD+ may affect glucose metabolism. Monitor blood sugar more closely and adjust medications as needed with your doctor.
High-dose NAD+ precursors may have mild blood-thinning effects. Tell your doctor if you're on blood thinners (anticoagulants).
Complementary pairing—Epithalon works on telomeres (protective caps on the ends of your chromosomes) while NAD+ supports cell energy and activates sirtuins (proteins that help repair DNA and protect against aging). They work in different ways but add to each other.
Generally safe to combine. BPC-157 supports healing while NAD+ provides cellular energy for repair processes.
Safe combination for comprehensive anti-aging. GHK-Cu focuses on tissue repair and skin health.
Can be used together for immune and cellular health support. No known negative interactions.
Excellent pairing! Resveratrol activates sirtuins (proteins that help repair DNA and protect against aging), which need NAD+ to function. They work together for longevity benefits.
Good combination. Quercetin may help stabilize NAD+ precursors and provides additional antioxidant benefits.
Supports your mitochondria (your cells' energy engines). Both support energy production in different ways.
Use caution—combining NAD+ precursors with high-dose niacin may cause excessive flushing. One or the other is usually sufficient.
NAD+ levels naturally decline 50% or more by middle age, and this drop is linked to many signs of aging. Boosting NAD+ helps maintain the cellular repair and energy production that keeps you feeling vital. It's like refilling your cells' gas tanks.
Your brain is an energy hog—it uses about 20% of your body's energy despite being only 2% of your weight. NAD+ supports the mitochondria (the power plants inside your cells) that power your neurons, and research shows promising effects on cognitive function and neuroprotection (protecting brain cells).
Every time you exercise, your muscles burn through NAD+ to produce energy. Boosting your NAD+ levels may help with recovery, endurance, and maintaining muscle function as you age. Many athletes notice improved workout recovery.
NAD+ plays a central role in how your body processes fats and sugars. Research shows it may help support healthy blood sugar levels, improve insulin sensitivity (how well your body responds to insulin), and support weight management efforts when combined with a healthy lifestyle.
Two different things are sold as "NAD+": the molecule itself, given by IV, and its oral precursors nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN). The published evidence for them is separate.
Oral NR has been through randomised trials. A double-blind safety trial in Parkinson's disease tested high-dose NR 3. Trials have also been run in heart failure with reduced ejection fraction 4 and in older adults with peripheral artery disease 5.
For NAD+ given by IV, one published study compared it directly against NR. Six people received 500 mg of NAD+ by IV and eight received 500 mg of NR, on four consecutive days. All 6 in the NAD+ group (6 of 6) reported moderate to severe abdominal cramping, diarrhoea, nausea, vomiting, increased heart rate, throat pain, congestion and chest pressure during infusion. Five of the 8 in the NR group reported minor tongue, jaw and arm tingling and mild cramping. All symptoms resolved when the infusion finished. Over 30 days, ALT, AST, hsCRP, BUN/creatinine and TSH did not change significantly; alkaline phosphatase fell significantly in the NAD+ group only, remaining within the normal reference range 6.
Participants set their own infusion rate by tolerance. Average total infusion time was 97 minutes for NAD+ against 37 minutes for NR, for the same 500 mg 6. A separate study infused NAD+ at 3 micromoles per minute over 6 hours, and found plasma NAD+ and its metabolites unchanged until after 2 hours 7.
Three hours after infusion, blood NAD+ was significantly higher in the NR group than in the NAD+ group 6.
The published human evidence divides by form. Oral NR and NMN have randomised trials in Parkinson's disease 3, heart failure with reduced ejection fraction 4 and peripheral artery disease 5, and a 2025 review covers precursor supplementation in ageing 1. A randomised placebo-controlled trial of NAD+ in heart failure from ischaemic cardiomyopathy has also been published 2. Direct IV NAD+ has two peer-reviewed studies: the tolerability comparison against NR in 6 and 8 participants respectively 6, and a 6-hour infusion study tracking NAD+ in plasma and urine 7. IV NAD+ is not FDA-approved, and clinic use is compounded. No published study reports outcomes beyond 30 days for either form.
Keeping it good
Store NAD+ powder in the refrigerator at 36-46°F (2-8°C). For oral supplements (NR, NMN), a cool, dry place works, but refrigeration extends shelf life. Keep away from light and moisture.
Reconstituted NAD+ solutions should be refrigerated and used within 14-21 days. Never freeze. Discard if solution becomes cloudy, discolored, or contains particles.
Not our opinion — the published record
2025
This comprehensive review evaluated human clinical trials of NAD+ precursors, finding that while NAD+ levels clearly decline with age, the clinical benefits of supplementation in humans are still being established. The review highlights the need for larger, longer trials.
Vinten KT, Trætowicz MM, Coskun E
2026
In 180 heart failure patients, IV NAD+ (given into a vein) significantly improved heart function (ejection fraction, the share of blood the heart pumps out with each beat) compared to placebo. Patients also showed trends toward fewer hospitalizations and better functional capacity (ability to do daily activities), suggesting NAD+ may help struggling hearts.
Yu X, Xu J, Cao J
2023
A phase I randomised, double-blind trial (a small first safety trial where chance decided who got the drug and nobody knew who got what) in 20 people with Parkinson's disease: 10 took nicotinamide riboside (a vitamin B3 form) 1,500 mg twice daily (3,000 mg/day) and 10 took placebo, for four weeks. All 20 finished. The main thing measured was how often moderate and severe side effects occurred: there were none, and mild side effects did not differ significantly between the two groups. Blood NAD+ rose up to 5-fold (up to 5 times higher). People on nicotinamide riboside showed a slight early rise in serum homocysteine (a blood chemical). Total MDS-UPDRS scores (a standard Parkinson's symptom rating) improved, but that change was also linked to a shorter time since the last levodopa dose (a Parkinson's drug). The authors support extending the dose range to 3,000 mg/day in phase II with safety monitoring.
Berven H, Kverneng S, Sheard E
2022
A 30-participant trial in patients with clinically stable heart failure with reduced ejection fraction (a weakened heart that pumps out less blood), given nicotinamide riboside 1,000 mg twice daily (2,000 mg/day). It appeared safe and well tolerated and approximately doubled whole blood NAD+. Within individuals, the rise in NAD+ correlated with increased basal (R2 = 0.413, P = 0.003) and maximal (R2 = 0.434, P = 0.002) respiration (energy-making) in peripheral blood mononuclear cells (a type of white blood cell), and with decreased NLRP3 expression (R2 = 0.330, P = 0.020) (NLRP3 is a protein that drives inflammation). The trial reports safety and tolerability; it was not designed to measure whether heart failure outcomes improved.
Wang DD, Airhart SE, Zhou B
2025
In older adults with blood vessel disease, 4 weeks of NAD+ precursor supplements (building blocks the body turns into NAD+) improved brain blood vessel function and thinking performance in several areas. The supplement also reduced oxidative stress (cell damage from unstable oxygen molecules) in blood vessel cells.
Szarvas Z, Reyff ZA, Peterfi A
2026
Clients received 500 mg of freeze-dried NAD+ (or NR, nicotinamide riboside) in 500 mL saline (salt water) through an IV (a drip into a vein) on four consecutive days. NAD+ infusions averaged about 97 minutes, and stomach and gut symptoms led staff to slow the rate.
Reyna K, et al.
2019
NAD+ was given through an IV at 3 micromoles per minute for 6 hours. Blood levels of NAD+ and its breakdown products (nicotinamide, methylnicotinamide, ADP-ribose, nicotinamide mononucleotide) did not change until after 2 hours. At 6 hours, more methylnicotinamide and NAD+ was found in urine, with no significant rise in urinary nicotinamide.
Grant R, Berg J, Mestayer R, Braidy N, Bennett J, Broom S, Watson J
If this isn't the right fit
Your questions
NAD+ is the molecule your cells actually use. NR (nicotinamide riboside) and NMN (nicotinamide mononucleotide) are precursors—building blocks your body converts into NAD+. Think of NAD+ as the finished product and NR/NMN as the ingredients. Oral supplements typically use precursors because NAD+ itself doesn't survive digestion well.
Several factors contribute: an enzyme called CD38 becomes more active with age and uses up NAD+; your body makes less NAD+ as its production slows down; and more DNA damage means repair enzymes (PARPs) use up more NAD+. It's a triple hit that drains your reserves over time.
They're related but not identical. Vitamin B3 (niacin, nicotinamide) can be converted into NAD+ through various pathways. NR and NMN are specialized forms that convert more directly to NAD+ with fewer side effects than high-dose niacin. Think of regular B3 as the slow route and NR/NMN as the express lane.
Both effectively raise NAD+ levels, and research supports both. NR has more human clinical trial data and is converted to NAD+ inside cells. NMN is one step closer to NAD+ in the conversion pathway. Some people try both and see which works better for them. There's no clear winner—both are valid choices.
When NAD+ enters your bloodstream quickly, it causes intense flushing, nausea, and chest tightness. Slow infusion rates (2-4 hours) allow your body to process the NAD+ gradually, dramatically reducing these uncomfortable effects. It's worth the extra time for a more pleasant experience.
This is complicated and requires medical guidance. Cancer cells are energy-hungry, raising theoretical concerns that boosting NAD+ could fuel their growth. However, some research suggests NAD+ might actually help certain cancer treatments. Always discuss with your oncologist—this isn't a decision to make on your own.
Most people notice subtle energy improvements within 2-4 weeks of consistent use. Some feel changes within days, while others take longer. The deeper cellular benefits—like improved DNA repair and sirtuin activation—happen behind the scenes and may not be 'felt' directly but contribute to healthier aging over time.
Human trials up to 12 weeks show excellent safety profiles at doses up to 2000-3000 mg daily. Long-term data (years) is still being collected, but current evidence is reassuring. NAD+ is a natural molecule your body already makes and uses—supplementation simply helps restore youthful levels.
7 sources
Every numbered marker on this page points to one of these. Same sources, same numbering as the NAD+ research profile on Peptide Initiative.
Want the deep science?
Every claim on this page traces back to the research database behind Peptide Initiative — studies, citations, clinical trial data, and the technical detail we deliberately left out here.
Open the research profileThis guide is education, not medical advice. NAD+ is a research compound that is not FDA-approved for human use. Talk to a clinician before taking anything.
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