Peptide Profile
NAD+
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.
Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team · Editorial standards
Compound Profile
Scientific & Efficacy Data
C21H27N7O14P2
Molecular Formula
663.4 g/mol
Molecular Weight
1-2 hours (plasma); tissue levels persist longer
Half-Life
Variable by route: ~30% oral (precursors), ~100% IV
Bioavailability
53-84-9
CAS #
5892
PubChem ID ↗
Developed By · 1906
Arthur Harden and William John Young
Lister Institute (London)
Primary Benefits
NAD+ is a cofactor for the enzymes that regulate cellular metabolism, DNA repair and immune function [6]. Whether raising it changes how a healthy person feels or performs has not been reported in a published trial [1].
A 2025 review of NAD+ precursor supplementation in human ageing sets out both the clinical evidence and its limits [1]. No published trial reports a lifespan or ageing outcome in people.
Oral nicotinamide riboside has been tested in a double-blind trial in Parkinson's disease [3] and in older adults with peripheral artery disease, where vascular and cognitive measures were assessed [5]. No published trial reports a cognitive outcome for IV NAD+.
Amino Acid Sequence
Not a peptide - NAD+ is a dinucleotide coenzymeDosing
How much
do I take?
Intravenous: Delivered straight into a vein through a drip (IV), done by a clinician.
Bioavailability Complete (about 100%) — delivered straight into the bloodstream.
Studied as 4 consecutive days; no established schedule
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].
Timing
Best time to take
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.
With food?
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.
If stacking
NAD+ precursors pair beautifully with sirtuin activators like resveratrol and quercetin—they work synergistically. CoQ10 and PQQ support the same mitochondrial health pathways. Space supplements 30 minutes apart if taking multiple.
Adjusting Your Dose
Increase if
- +You've used the starting dose for 4+ weeks with good tolerance
- +You want more noticeable energy or cognitive benefits
- +Research suggests higher doses for your specific goals
Decrease if
- -You experience persistent flushing or skin reactions
- -Digestive upset doesn't resolve after the first week
- -You feel overly stimulated or have trouble sleeping
- -Any side effect concerns you
Signs of right dose
- ✓Sustained energy throughout the day without crashes
- ✓Mental clarity and focus feel improved
- ✓Better exercise recovery
- ✓Improved sleep quality (despite daytime energy)
Suitability
Is this
right for me?
Best For
Healthy Aging Enthusiasts
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.
Brain Health Seekers
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 that power your neurons, and research shows promising effects on cognitive function and neuroprotection.
Athletes and Active People
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.
Metabolic Support Seekers
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, and support weight management efforts when combined with a healthy lifestyle.
Consider Alternatives If
Goal: Cellular energy without supplements
Consider: Intermittent fasting (naturally boosts NAD+), Regular exercise, Reducing alcohol consumption
Goal: Anti-aging through different pathways
Consider: Epithalon (telomere support), Metformin (AMPK activation), Rapamycin (mTOR pathway)
Goal: Mitochondrial support alternatives
Consider: CoQ10, PQQ, Alpha-lipoic acid, Acetyl-L-carnitine
Who Should Avoid
Do not use if
- ×You have active cancer—NAD+ fuels cellular energy production, and there's theoretical concern this could benefit cancer cells
- ×You are pregnant or breastfeeding—safety hasn't been established for these populations
- ×You have a known allergy to niacin, nicotinamide, or related B vitamins
- ×You have severe liver disease—NAD+ metabolism involves the liver
- ×You're taking high-dose niacin already—combining could cause excessive flushing
Use with caution if
- !You take blood pressure medications—NAD+ can affect vascular function
- !You have diabetes—monitor blood sugar as NAD+ may affect glucose metabolism
- !You take chemotherapy drugs—potential interactions need medical oversight
- !You have gout—some NAD+ precursors may affect uric acid levels
- !You take immunosuppressants—NAD+ affects immune cell function
Administration
How do I
use it?
Reconstitution
What you need
- •NAD+ powder vial (for injectable forms)
- •Sterile saline or bacteriostatic water
- •Sterile syringes and needles
- •Alcohol swabs
- •Sterile vial for mixing
Injection
Route
Intravenous (IV) infusion is most common for direct NAD+; subcutaneous or intramuscular injections are less common but sometimes used
Best sites
- •IV: Arm veins (administered by healthcare professional)
- •IM: Deltoid (upper arm) or gluteus (buttock)
- •SubQ: Abdominal area (if applicable)
Technique
- 1.IV NAD+ should only be administered by qualified healthcare professionals
- 2.The infusion rate is crucial—too fast causes intense flushing and discomfort
- 3.Typical infusions run over 2-4 hours for 250-500mg doses
- 4.Slower rates (4+ hours) are better tolerated but require more time
- 5.Monitor for flushing, nausea, or chest tightness during infusion
Storage
Signs of degradation
Sample Daily Schedule
Safety
Is it
safe?
Safety Profile
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.
Common Side Effects
Experienced by some users
Flushing and warmth
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.
Management: 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.
Digestive upset
Mild nausea, stomach discomfort, or loose stools when first starting NAD+ supplements. Your gut is adjusting to the new compound.
Management: 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.
Mild headache
Some people experience headaches when starting NAD+ supplementation. This may relate to changes in cellular metabolism or blood flow.
Management: Stay well-hydrated—dehydration worsens headaches. Usually resolves within the first few days. If persistent, try reducing your dose.
Less Common
- •Increased energy or restlessness
- •Vivid dreams
These typically resolve with continued use or dose adjustment.
Stop and Seek Help If
- ×Any signs of allergic reaction—difficulty breathing, severe rash, swelling
- ×Persistent digestive problems that don't improve after 2 weeks
- ×Severe or persistent headaches
- ×Heart palpitations or significant changes in heart rhythm
- ×If you develop any condition where NAD+ is contraindicated (like cancer diagnosis)
- ×Side effects that concern you or affect quality of life
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.
Interactions
With other peptides
- ✓Epithalon - Complementary pairing—Epithalon works on telomeres while NAD+ supports cellular energy and sirtuin activation. Different but synergistic anti-aging mechanisms.
- ✓BPC-157 - Generally safe to combine. BPC-157 supports healing while NAD+ provides cellular energy for repair processes.
- ✓GHK-Cu - Safe combination for comprehensive anti-aging. GHK-Cu focuses on tissue repair and skin health.
- ✓Thymosin Alpha-1 - Can be used together for immune and cellular health support. No known negative interactions.
With medications
- !Chemotherapy drugs - Theoretical concern that boosting cellular energy could benefit cancer cells. Always consult your oncologist before using NAD+ during cancer treatment.
- ✓Blood pressure medications - NAD+ can affect blood vessel function. Monitor blood pressure and work with your doctor if you're on antihypertensives.
- ✓Diabetes medications - NAD+ may affect glucose metabolism. Monitor blood sugar more closely and adjust medications as needed with your doctor.
- ✓Blood thinners - High-dose NAD+ precursors may have mild blood-thinning effects. Inform your doctor if you're on anticoagulants.
With supplements
- ✓Resveratrol - Excellent pairing! Resveratrol activates sirtuins, which need NAD+ to function. They work synergistically for longevity benefits.
- ✓Quercetin - Good combination. Quercetin may help stabilize NAD+ precursors and provides additional antioxidant benefits.
- ✓CoQ10 - Complementary mitochondrial support. Both support energy production through different pathways.
- !High-dose niacin - Use caution—combining NAD+ precursors with high-dose niacin may cause excessive flushing. One or the other is usually sufficient.
Effectiveness
Does it
work?
Evidence Level
Moderate human trials
What to Expect
Week 1-2
What you might notice
- •Possible mild flushing or warmth after taking
- •Maybe some digestive adjustment
- •Subtle increase in energy for some people
- •Sleep might feel slightly different
What's normal
- •Taking time to notice anything significant
- •Mild side effects that improve over days
- •Not feeling dramatic changes right away
What's next
- →Continue with your starting dose
- →Note any changes in energy or sleep
- →Side effects typically reduce after this period
Week 3-4
What you might notice
- •More consistent energy throughout the day
- •Possible improvements in mental clarity
- •Better workout recovery for active people
- •Side effects should be minimal by now
What's normal
- •Subtle rather than dramatic improvements
- •Good days and less-good days are normal
- •Benefits building gradually
What's next
- →Consider increasing dose if well-tolerated
- →Continue tracking energy and cognition
- →Maintain consistent daily timing
Month 2-3 and beyond
What you might notice
- •Sustained improvements in energy and vitality
- •Better overall sense of well-being
- •Improved exercise capacity and recovery
- •Some users report better skin health
What's normal
- •Benefits plateau at a new, better baseline
- •Consistent positive effects rather than ever-increasing
- •NAD+ becomes part of your wellness routine
What's next
- →Continue long-term supplementation for ongoing benefits
- →Consider periodic blood work to track metabolic markers
- →Adjust dose based on your response and goals
Signs It's Working
Energy and Vitality
- ✓More consistent energy throughout the day
- ✓Fewer afternoon energy crashes
- ✓Feeling more alert without caffeine dependence
- ✓Better stamina for physical activities
- ✓Waking up feeling more refreshed
Cognitive Function
- ✓Improved mental clarity and focus
- ✓Better memory recall
- ✓Faster mental processing
- ✓More sustained attention during tasks
- ✓Reduced brain fog
Physical Recovery
- ✓Faster recovery after exercise
- ✓Less muscle soreness
- ✓Better exercise performance
- ✓Improved sleep quality
- ✓Enhanced overall physical resilience
Not Seeing Results?
Common reasons
- •Not taking consistently—NAD+ works best with daily, ongoing use
- •Dose too low—some people need higher amounts to notice benefits
- •Poor quality supplement—look for third-party tested products from reputable brands
- •Expecting overnight results—benefits build over weeks to months
- •Not addressing lifestyle factors—NAD+ supplements work best alongside good sleep, exercise, and nutrition
- •Taking at wrong time—evening doses may cause sleep issues that mask energy benefits
Key Research
[1]"NAD+ precursor supplementation in human ageing: clinical evidence and challenges"
Vinten KT, Trætowicz MM, Coskun E, 2025
Finding: 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.
View Study[2]"Effect of Nicotinamide Adenine Dinucleotide on Heart Failure Caused by Ischemic Cardiomyopathy: A Randomized, Placebo-Controlled Trial"
Yu X, Xu J, Cao J, 2026
Finding: In 180 heart failure patients, IV NAD+ significantly improved heart function (ejection fraction) compared to placebo. Patients also showed trends toward fewer hospitalizations and better functional capacity, suggesting NAD+ may help struggling hearts.
View Study[3]"NR-SAFE: a randomized, double-blind safety trial of high dose nicotinamide riboside in Parkinson's disease"
Berven H, Kverneng S, Sheard E, 2023
Finding: A phase I randomised, double-blind trial in 20 people with Parkinson's disease, split 10 on nicotinamide riboside 1,500 mg twice daily (3,000 mg/day) and 10 on placebo, for four weeks. All 20 completed. The primary outcome was the frequency of moderate and severe adverse events: there were none, and mild adverse events did not differ significantly between the two groups. Blood NAD+ rose up to 5-fold. NR recipients showed a slight initial rise in serum homocysteine. Total MDS-UPDRS scores improved, but that change was also associated with a shorter interval since the last levodopa dose. The authors support extending the dose range to 3,000 mg/day in phase II with safety monitoring.
View Study[4]"Safety and Tolerability of Nicotinamide Riboside in Heart Failure With Reduced Ejection Fraction"
Wang DD, Airhart SE, Zhou B, 2022
Finding: A 30-participant trial in patients with clinically stable heart failure with reduced ejection fraction, given nicotinamide riboside 1,000 mg twice daily (2,000 mg/day). NR 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 in peripheral blood mononuclear cells, and with decreased NLRP3 expression (R2 = 0.330, P = 0.020). The trial reports safety and tolerability; it was not designed to measure whether heart failure outcomes improved.
View Study[5]"Effects of NAD+ supplementation with oral nicotinamide riboside on vascular health and cognitive function in older adults with peripheral artery disease"
Szarvas Z, Reyff ZA, Peterfi A, 2025
Finding: In older adults with blood vessel disease, 4 weeks of NAD+ precursor supplementation improved brain blood vessel function and cognitive performance across multiple domains. The supplement also reduced oxidative stress in blood vessel cells.
View Study[6]"Intravenous infusion of nicotinamide adenine dinucleotide (NAD+) versus nicotinamide riboside (NR): a retrospective tolerability pilot study"
Reyna K, et al., 2026
Finding: Clients received 500 mg lyophilized NAD+ (or NR) in 500 mL saline IV on four consecutive days; NAD+ infusions averaged ~97 minutes with GI symptoms prompting slower rates.
View Study[7]"A Pilot Study Investigating Changes in the Human Plasma and Urine NAD+ Metabolome During a 6 Hour Intravenous Infusion of NAD+"
Grant R, Berg J, Mestayer R, Braidy N, Bennett J, Broom S, Watson J, 2019
Finding: NAD+ was infused intravenously at 3 micromoles per minute for 6 hours. Plasma NAD+ and its metabolites (nicotinamide, methylnicotinamide, ADP-ribose, nicotinamide mononucleotide) did not change until after 2 hours. Increased urinary excretion of methylnicotinamide and NAD+ was detected at 6 hours, with no significant rise in urinary nicotinamide.
View StudyOrgan Targets
Powered by Human Organ Atlas
Organs and body systems affected by NAD+, mapped to the Human Organ Atlas — an open-access 3D portal featuring 56 organs imaged at near-cellular resolution.
Brain
Primary targetNervous System
Critical coenzyme for neuronal energy metabolism and sirtuin-mediated neuroprotection
Heart
Secondary effectCardiovascular System
Supports cardiac mitochondrial function and NAD-dependent DNA repair enzymes
Liver
Secondary effectDigestive System
Essential for hepatic metabolism, detoxification, and circadian regulation
Simple explanation
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.
Detailed mechanism
Nicotinamide adenine dinucleotide (NAD+) is an essential coenzyme present in all living cells, functioning as a critical electron carrier in metabolic redox reactions. It exists in oxidized (NAD+) and reduced (NADH) forms, cycling between these states during glycolysis, the citric acid cycle, and oxidative phosphorylation. Beyond energy metabolism, NAD+ serves as a substrate for three major enzyme families: sirtuins (SIRT1-7), which regulate gene expression, DNA repair, and metabolic homeostasis; poly(ADP-ribose) polymerases (PARPs), essential for DNA damage repair; and CD38/CD157, ectoenzymes involved in calcium signaling. Age-related NAD+ decline occurs through increased CD38 activity, reduced biosynthesis, and higher PARP consumption due to accumulated DNA damage. NAD+ precursors (NR, NMN) restore levels via the salvage pathway: NR is converted to NMN by nicotinamide riboside kinases, and NMN is then converted to NAD+ by NMNAT enzymes. This restoration activates SIRT1-mediated deacetylation of PGC-1α, enhancing mitochondrial biogenesis and oxidative metabolism.
Works well with
- ✓Resveratrol
- ✓Quercetin
- ✓CoQ10
- ✓PQQ
- ✓Metformin (under medical supervision)
Avoid combining with
- ×High-dose niacin supplements (may cause excessive flushing)
- ×Chemotherapy drugs (potential interactions—consult oncologist)
- ×Blood thinners at high doses (increased bleeding risk)
Frequently Asked Questions