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
Suggested dose
250 – 500 mg
Compound profile
Scientific & efficacy data
Mitochondrial
Peptide profile
Moderate human trials
NAD+
250 mg NR or NMN · Once daily
Molecular formula
C21H27N7O14P2
- Mol. weight
- 663.4 g/mol
- CAS number
- 53-84-9
- PubChem
- 5892
- Developed · 1906
- Arthur Harden and William John Young
Lister Institute (London)
Amino acid sequence
Not a peptide - NAD+ is a dinucleotide coenzymeCellular Energy
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].
Longevity Support
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.
Dosing
How much do I take?
250 – 500 mg · oral
250 – 500 mg
Covers all 3 documented dose levels · 2 administration routes · timing · dose-adjustment guidance.
Suitability
Is this right for me?
Best for cellular energy and vitality & healthy aging and longevity
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
Do not use if
Use with caution if
Not sure?
Compare NAD+ with similar peptides to find the best fit for your goals.
Administration
How do I use it?
Oral (NR or NMN precursors) · Intravenous infusion
Route
Intravenous (IV) infusion is most common for direct NAD+; subcutaneous or intramuscular injections are less common but sometimes used
Best sites
Covers reconstitution · step-by-step technique · storage · a sample daily schedule.
Safety
Is it safe?
3 common side effects · 1 serious
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
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.
With other peptides
- Safe:Epithalon — Complementary pairing—Epithalon works on telomeres while NAD+ supports cellular energy and sirtuin activation. Different but synergistic anti-aging mechanisms.
- Safe:BPC-157 — Generally safe to combine. BPC-157 supports healing while NAD+ provides cellular energy for repair processes.
- Safe:GHK-Cu — Safe combination for comprehensive anti-aging. GHK-Cu focuses on tissue repair and skin health.
- Safe:Thymosin Alpha-1 — Can be used together for immune and cellular health support. No known negative interactions.
With medications
- Caution:Chemotherapy drugs — Theoretical concern that boosting cellular energy could benefit cancer cells. Always consult your oncologist before using NAD+ during cancer treatment.
- Safe:Blood pressure medications — NAD+ can affect blood vessel function. Monitor blood pressure and work with your doctor if you're on antihypertensives.
- Safe:Diabetes medications — NAD+ may affect glucose metabolism. Monitor blood sugar more closely and adjust medications as needed with your doctor.
- Safe:Blood thinners — High-dose NAD+ precursors may have mild blood-thinning effects. Inform your doctor if you're on anticoagulants.
With supplements
- Safe:Resveratrol — Excellent pairing! Resveratrol activates sirtuins, which need NAD+ to function. They work synergistically for longevity benefits.
- Safe:Quercetin — Good combination. Quercetin may help stabilize NAD+ precursors and provides additional antioxidant benefits.
- Safe:CoQ10 — Complementary mitochondrial support. Both support energy production through different pathways.
- Safe:High-dose niacin — Use caution—combining NAD+ precursors with high-dose niacin may cause excessive flushing. One or the other is usually sufficient.
Effectiveness
How do I know it's working?
Moderate human trials · first signs week 1-2
Evidence level
Moderate human trials
(Phase 1-2)
Regulatory status
Not FDA approved
Onset of effects
Moderate
(1-2 weeks)
How it works
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.
The deeper 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.
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
Questions
Frequently asked
What's the difference between NAD+, NR, and NMN?
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.
Why do NAD+ levels decline with age?
Several factors contribute: an enzyme called CD38 becomes more active with age and consumes NAD+; your body makes less NAD+ as biosynthesis slows down; and increased DNA damage means more NAD+ gets used up by repair enzymes (PARPs). It's like a triple hit that depletes your reserves over time.
Is NAD+ the same as vitamin B3?
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.
Should I take NR or NMN?
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.
Why are IV NAD+ infusions so slow?
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.
Can I take NAD+ if I have cancer?
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.
How long does it take to feel benefits?
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.
Is NAD+ supplementation safe long-term?
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.
Ready for the protocol?
Every dosing tier, administration route, timing note, and dose-adjustment rule for NAD+, on one page.