How to Increase NAD+ Levels Naturally: What the Science Actually Recommends

Medically reviewed by the HealthyMag Editorial Team | Last updated: April 2026 | Reading time: ~14 minutes

You’ve probably heard that NAD+ is one of the most important molecules in the human body. Longevity researchers study it obsessively. Celebrities pay hundreds of dollars per session to get it delivered intravenously. And supplement companies make bold claims about their ability to “skyrocket” your levels.

But what does the science actually say about how to increase NAD+ levels? Which strategies have genuine clinical evidence behind them? And which are expensive detours that won’t move the needle?

This article answers those questions — systematically, and with reference to peer-reviewed research. We’ll cover what raises NAD+ levels (and by how much), what lowers them, what foods and lifestyle changes make a real difference, and what supplementation options are backed by human clinical trials.

Why Your NAD+ Levels Matter — A Brief Recap

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme present in every cell of your body. It serves two master functions:

• Powering your mitochondria: NAD+ is the essential electron carrier that your cells’ mitochondria use to convert food into ATP — the molecule that fuels literally every biological process, from thinking to breathing to digesting a meal.
• Activating your longevity enzymes: NAD+ is required to activate sirtuins (SIRT1–SIRT7), a family of proteins that regulate DNA repair, inflammation control, circadian rhythm, and stress resistance. Without adequate NAD+, these “longevity switches” simply don’t flip.

The problem is that NAD+ declines with age — substantially. Research published in Cell Metabolism has documented a roughly 50% drop in NAD+ levels between the ages of 20 and 50, with continued decline thereafter. This decline is now believed to be not merely a symptom of aging, but a contributing cause of the fatigue, cognitive fog, reduced muscle mass, and metabolic dysfunction that many people associate with “just getting older.”

Reversing or slowing this decline is one of the most active areas of aging research today. And there are now multiple evidence-based strategies for doing so.

What Causes Low NAD+ Levels?

Before discussing how to raise NAD+, it’s useful to understand what’s depleting it. Several factors accelerate NAD+ decline beyond the normal pace of aging:

1. Aging Itself

As you age, two things happen simultaneously: your cells consume NAD+ faster (due to accumulated DNA damage activating PARP repair enzymes, which are voracious NAD+ consumers) and your body’s ability to synthesize NAD+ from dietary precursors becomes less efficient. The result is a progressive NAD+ deficit.

2. Chronic Inflammation

Chronic low-grade inflammation — the “inflammaging” that underlies many age-related diseases — activates CD38, an enzyme that degrades NAD+. People with elevated inflammatory markers tend to have lower NAD+ levels. This creates a vicious cycle: low NAD+ reduces cellular resilience, which worsens inflammation, which further depletes NAD+.

3. Alcohol Consumption

Alcohol metabolism is highly NAD+-intensive. When your liver processes ethanol, it converts large quantities of NAD+ to NADH. Regular alcohol consumption can significantly deplete the available NAD+ pool, particularly in liver cells, contributing to the metabolic and mitochondrial dysfunction associated with heavy drinking.

4. Sun Exposure and DNA Damage

UV radiation from sun exposure causes DNA strand breaks that activate PARP enzymes — which consume NAD+ to repair the damage. Frequent, unprotected sun exposure can meaningfully deplete NAD+ over time. This is one reason NAD+ depletion and skin aging often track together.

5. Poor Diet and Sedentary Lifestyle

Diets low in NAD+ precursor nutrients (primarily vitamin B3 in its various forms) directly reduce the raw material available for NAD+ synthesis. Physical inactivity reduces the metabolic demand that would otherwise stimulate NAD+ production pathways in muscle tissue.

6. Sleep Deprivation

NAD+ levels follow a circadian rhythm, peaking in the morning and declining through the day. Sleep deprivation and circadian disruption disrupt this rhythm, leading to chronically suboptimal NAD+ availability. Research in animal models has shown that sleep deprivation directly impairs NAD+ metabolism in the brain.

How to Increase NAD+ Levels Naturally: Evidence-Based Strategies

With the depletion factors in mind, here are the strategies that have meaningful scientific support for raising NAD+ levels in humans.

1. Exercise — Especially High-Intensity and Strength Training

Exercise is one of the most powerful natural NAD+ boosters available, and it works through multiple mechanisms.

During exercise, your muscles rapidly consume ATP, increasing the demand for NADH to fuel the mitochondrial electron transport chain. To meet this demand, your cells upregulate the enzymes involved in NAD+ synthesis. Simultaneously, exercise activates AMPK (AMP-activated protein kinase), which stimulates NAMPT — the rate-limiting enzyme in the NAD+ salvage pathway.

High-intensity interval training (HIIT) appears particularly effective at raising NAD+ and mitochondrial content in skeletal muscle. A 2022 study in Nature Aging found that both endurance training and resistance training increased NAD+ metabolites in muscle tissue, with the benefits more pronounced in older adults than younger ones — suggesting exercise may partially compensate for the age-related decline in NAD+ synthesis efficiency.

Practical recommendation: Aim for at least 150 minutes of moderate-intensity aerobic exercise per week, with 2–3 sessions of resistance training. Even brisk walking meaningfully raises NAMPT activity compared to sedentary behavior.

2. Caloric Restriction and Intermittent Fasting

Caloric restriction (CR) — eating significantly less than ad libitum — is one of the most consistently reproduced interventions for increasing NAD+ levels and extending lifespan in model organisms. The mechanism is well-understood: reduced caloric intake lowers the cellular NADH/NAD+ ratio (meaning less NADH is produced, so more NAD+ remains available), and CR also directly activates NAMPT, increasing de novo NAD+ synthesis.

Intermittent fasting (IF) produces similar effects through overlapping mechanisms. During fasting periods, AMPK is activated and mTOR is suppressed — both of which favor NAD+ synthesis over consumption. A 2019 study by Cantó and colleagues found that short-term fasting significantly raised muscle NAD+ levels in rodents, with analogous pathways activated in human subjects practicing time-restricted eating.

Practical recommendation: A 16:8 intermittent fasting protocol (16 hours fasting, 8-hour eating window) or a simple habit of avoiding late-night eating may meaningfully support NAD+ levels without requiring severe caloric restriction.

3. Heat Exposure: Sauna and Hot Baths

Regular sauna use has been shown to activate many of the same cellular stress-response pathways as exercise, including pathways that upregulate NAD+ synthesis. Heat stress activates heat shock proteins, AMPK, and PGC-1α — the “master regulator” of mitochondrial biogenesis — all of which either directly or indirectly support NAD+ metabolism.

Finnish research tracking sauna use over decades has found strong associations between frequent sauna bathing (4–7 times per week) and lower rates of cardiovascular disease, dementia, and all-cause mortality. While NAD+ is not the only mechanism, it is plausibly one of them.

Practical recommendation: 15–20 minutes in a sauna at 80–100°C (176–212°F), 3–4 times per week. Hot baths (40–42°C / 104–108°F) for 20–30 minutes provide a milder version of this stimulus.

4. Cold Exposure

Cold exposure — through cold showers, ice baths, or cold water immersion — activates the sympathetic nervous system and triggers mitochondrial biogenesis in brown adipose tissue (BAT). Cold-induced shivering also significantly increases NAMPT expression in skeletal muscle, which is the rate-limiting step in the NAD+ salvage pathway.

Research from Dr. Rhonda Patrick and others suggests that the combination of heat and cold exposure (contrast therapy) may produce additive benefits for mitochondrial function and NAD+ metabolism.

Practical recommendation: Cold showers (ending with 2–3 minutes of cold water) daily, or cold water immersion at 10–15°C (50–59°F) for 10–15 minutes several times per week.

5. Prioritize Sleep and Circadian Alignment

Because NAD+ follows a circadian rhythm governed by clock genes (SIRT1, CLOCK, BMAL1), protecting your circadian rhythm is directly protective of NAD+ metabolism. Practical steps:

• Sleep 7–9 hours per night consistently
• Maintain a regular sleep/wake schedule (even on weekends)
• Get bright light exposure within 30–60 minutes of waking
• Avoid bright artificial light (especially blue-spectrum screens) in the 2 hours before bed
• Keep your sleeping environment cool and dark

These are not “nice to have” additions. Circadian disruption — including the chronic sleep deprivation that affects a majority of adults — directly impairs the NAMPT-dependent NAD+ synthesis cycle.

6. Reduce Alcohol Consumption

Even moderate alcohol intake (2–3 drinks per day) meaningfully depletes hepatic NAD+. If raising NAD+ levels is a priority, reducing or eliminating alcohol is one of the highest-impact lifestyle changes available — both because it stops active NAD+ depletion and because it reduces the inflammation that further degrades NAD+ via CD38 activation.

7. Manage Chronic Stress

Chronic psychological stress elevates cortisol and activates inflammatory pathways, both of which accelerate NAD+ depletion. Mind-body practices with documented effects on inflammatory markers — including meditation, yoga, tai chi, and controlled breathing — may indirectly support NAD+ levels by reducing the inflammatory burden that depletes them.

What Foods Increase NAD+ Levels?

Diet plays a genuine but often overstated role in NAD+ levels. Here’s an honest assessment of what the evidence actually shows.

Foods Rich in NAD+ Precursors

The most direct dietary route to higher NAD+ is consuming foods rich in niacin (vitamin B3) and its derivatives. The body converts dietary niacin into NAD+ through the Preiss-Handler pathway.

Top food sources include:

• Turkey and chicken breast: Among the richest sources of niacin and tryptophan (another NAD+ precursor). A 3-oz serving of turkey breast provides roughly 10 mg of niacin.
• Wild-caught salmon and tuna: Excellent sources of both niacin and essential fatty acids that support mitochondrial membrane health. A 3-oz serving of tuna provides approximately 11 mg of niacin.
• Beef liver: One of the most nutrient-dense foods available, providing niacin, riboflavin, CoQ10, and other mitochondrial co-factors in meaningful amounts.
• Mushrooms: Particularly crimini (baby bella) and shiitake varieties, which contain NAD+ precursors and beta-glucans that support mitochondrial function.
• Green vegetables: Edamame, peas, and asparagus contain meaningful amounts of niacin and other B vitamins involved in NAD+ metabolism.
• Whole grains: Brown rice, oats, and whole wheat provide niacin and other B vitamins, though bioavailability is lower than animal sources.

Foods That Activate Sirtuins (NAD+ Partners)

Because sirtuins require both NAD+ and their activating compounds to function, foods rich in sirtuin activators amplify the benefit of adequate NAD+ levels:

• Red grapes and red wine (in moderation): Contain resveratrol, a polyphenol that directly activates SIRT1. Note that even moderate alcohol consumption depletes NAD+ — so red wine is a net negative unless consumed in very small amounts. Grape juice or whole grapes are a better option.
• Blueberries, raspberries, and blackberries: Rich in quercetin and other polyphenols with sirtuin-activating properties.
• Dark chocolate (85%+ cacao): Contains flavanols that activate SIRT1 and AMPK.
• Green tea: EGCG (epigallocatechin gallate) activates multiple cellular stress-response pathways relevant to NAD+ metabolism.
• Extra virgin olive oil: Oleocanthal and other phenolics activate SIRT1 and reduce the CD38-mediated NAD+ degradation associated with inflammation.

The Honest Limitation of Diet Alone

Here’s the critical caveat that most health articles understate: diet alone is unlikely to fully compensate for the age-related decline in NAD+ levels.

The reason is metabolic. As you age, the efficiency of your NAD+ synthesis pathways declines — particularly the salvage pathway involving NAMPT. Even with an excellent diet rich in niacin and NAD+ precursors, the enzymatic machinery needed to convert those precursors into NAD+ becomes less effective.

This is why researchers studying NAD+ in aging almost universally supplement their dietary interventions with high-dose precursor supplementation. Diet is the foundation, but supplementation is typically required to achieve clinically meaningful NAD+ restoration in middle-aged and older adults.

NAD+ Supplements: What the Clinical Evidence Shows

The clinical trial landscape on oral NAD+ precursors has expanded significantly since 2016. Here is what the peer-reviewed evidence currently supports:

Nicotinamide Riboside (NR)

The landmark 2016 study by Trammell et al. (Nature Communications) established that oral NR supplementation safely and significantly raised human blood NAD+ levels — by up to 60% at 1,000 mg/day over 8 weeks. Subsequent trials have replicated this finding.

A 2019 clinical trial by Elhassan et al. (Cell Reports) specifically studied NR in older men (aged 70–80) and found that it raised skeletal muscle NAD+ metabolites and showed early improvements in muscle NAD+ utilization. This is particularly relevant because skeletal muscle is one of the primary sites of age-related NAD+ decline.

A 2020 study by Martens et al. (Nature Communications) found that 1,000 mg of NR daily for 6 weeks in older adults with mildly elevated blood pressure reduced aortic stiffness and lowered systolic blood pressure — suggesting that NAD+ restoration via NR has measurable cardiovascular effects beyond subjective energy improvement.

Nicotinamide Mononucleotide (NMN)

NMN is the precursor favored by Dr. David Sinclair. Human clinical trials are somewhat newer than those on NR, but the evidence is building.

A 2021 randomized controlled trial by Yoshino et al. (Science) found that 250 mg/day of NMN for 10 weeks in postmenopausal women with prediabetes significantly improved skeletal muscle insulin signaling and gene expression related to energy metabolism — even without changes in body weight or composition.

A Japanese RCT by Irie et al. (NPJ Aging and Mechanisms of Disease, 2020) confirmed the safety and efficacy of oral NMN at 250 mg/day in healthy older men, demonstrating significant increases in blood NAD+ metabolites with no adverse effects.

Niacinamide (Nicotinamide)

Niacinamide is the most cost-effective of the oral NAD+ precursors, with decades of research behind it. As the direct precursor in the NAD+ salvage pathway, it feeds NAD+ synthesis through the most efficient biochemical route available to cells.

Unlike niacin (which causes flushing), niacinamide is well-tolerated at high doses. Research by Bogan and Brenner (published in the Annual Review of Nutrition) established niacinamide as one of the most efficient NAD+ precursors in human cell biology. More recent research confirms that high-dose niacinamide (500–1,000 mg) produces NAD+-raising effects comparable to NMN and NR.

The clinical advantage of niacinamide: decades of safety data, no flushing, dramatically lower cost per dose, and direct entry into the most efficient NAD+ synthesis pathway.

Why Raising NAD+ Alone Isn’t Enough

Here is something that the NAD+ supplement marketing rarely discusses honestly: NAD+ is necessary but not sufficient for optimal mitochondrial function.

Think of your mitochondria as a complex production line with many essential components. NAD+ is crucial — it’s the electron carrier that feeds the energy-production chain. But the chain has other critical components:

• Coenzyme Q10: The electron shuttle within the mitochondrial inner membrane. Without adequate CoQ10, electrons cannot be efficiently passed along the chain, regardless of how much NAD+ is available. CoQ10 declines with age and is depleted by statin medications.
• PQQ (Pyrroloquinoline Quinone): Activates the PGC-1α gene, which is the master signal for your cells to build new mitochondria. You can have optimal NAD+ and optimal CoQ10, but if you have too few mitochondria, your total energy output remains limited. PQQ addresses the quantity of mitochondria, not just their efficiency.
• Acetyl-L-Carnitine: Transports long-chain fatty acids across the mitochondrial inner membrane for beta-oxidation. Without carnitine, fats — which should be your cells’ primary fuel during rest — cannot efficiently enter the mitochondria at all.
• Alpha-Lipoic Acid: Protects mitochondrial membranes from the oxidative damage that is an inevitable byproduct of energy production. It also regenerates other antioxidants (including vitamins C and E) and independently activates AMPK.
• D-Ribose: The sugar backbone of ATP itself. During recovery from illness, intense exercise, or chronic fatigue, ATP can be depleted faster than it can be regenerated. D-ribose provides the structural component needed to rebuild ATP rapidly.
• Magnesium: ATP in the cell exists primarily as a magnesium-ATP complex. Magnesium deficiency — which is remarkably common — directly impairs ATP synthesis and utilization. It is also required for over 300 enzymatic reactions, many of which are directly involved in energy metabolism.

The upshot: if you’re taking an NAD+ precursor but neglecting these co-factors, you’re optimizing one part of the system while leaving others rate-limited. True mitochondrial optimization requires addressing all of them together.

A Comprehensive Approach: What a Full Mitochondrial Protocol Looks Like

Combining everything above, an evidence-based mitochondrial optimization protocol looks something like this:

Lifestyle Foundation

• Regular exercise (aerobic + resistance, ≥150 min/week moderate intensity)
• Consistent 7–9 hours of sleep with stable circadian timing
• Time-restricted eating (16:8 IF or a variant)
• Heat exposure (sauna or hot baths 3–4x/week)
• Minimal alcohol
• Stress management practice daily

Dietary Foundation

• High protein from quality animal sources (turkey, salmon, beef liver)
• Rich in polyphenols (berries, dark leafy greens, olive oil, green tea)
• Minimal ultra-processed foods (which drive inflammation and NAD+ depletion via CD38)
• Adequate whole-food sources of B vitamins and magnesium

Supplementation Protocol

For most people over 40, lifestyle and diet alone will not fully compensate for the age-related decline in NAD+ synthesis. A well-designed supplementation protocol should include:

• An NAD+ precursor (niacinamide, NR, or NMN) at a clinically meaningful dose
• A sirtuin activator (resveratrol / trans-resveratrol from itadori extract)
• PQQ for mitochondrial biogenesis
• CoQ10 for electron transport optimization
• Acetyl-L-Carnitine for fuel delivery
• Alpha-Lipoic Acid for membrane protection
• D-Ribose for ATP substrate support
• Bioavailable magnesium
• Absorption enhancers (such as BioPerine) to maximize polyphenol bioavailability

This is a sophisticated stack — and assembling it from individual supplements gets expensive quickly. A more practical approach is a single formula that combines these ingredients at meaningful doses with demonstrated bioavailability.

Advanced Mitochondrial Formula, developed by Dr. Frank Shallenberger — a 77-year-old physician who maintains the metabolic profile of a man decades younger — checks all of these boxes. The formula includes niacinamide (for NAD+ boosting), D-ribose, itadori extract (for sirtuin activation), PQQ, acetyl-L-carnitine, CoQ10, quercetin, alpha-lipoic acid, curcumin, BioPerine, and bioavailable magnesium.

Rather than addressing one piece of the mitochondrial puzzle, it addresses the whole system — which is why results tend to be more comprehensive than those seen with standalone NAD+ precursors alone.

It’s backed by a 90-day, down-to-the-last-pill money-back guarantee, so the financial risk of trying it is minimal.

→ See the full ingredient breakdown and current pricing for Advanced Mitochondrial Formula

Disclosure: HealthyMag may receive a commission if you purchase through this link, at no additional cost to you. We only feature products whose formulations align with the clinical research we discuss.

How Long Does It Take to See Results?

A realistic timeline for NAD+-boosting interventions, based on the clinical literature:

• 1–2 weeks: Blood NAD+ levels begin to rise measurably with supplementation. Some people notice early improvements in energy or sleep quality.
• 3–4 weeks: Cellular NAD+ restoration is typically well-established. Most clinical trials using subjective energy and fatigue measures begin to see statistically significant differences at this timeframe.
• 6–8 weeks: Tissue-level effects become more apparent. Studies measuring muscle NAD+ metabolites, mitochondrial enzyme activity, and functional markers (like VO2 max, insulin sensitivity, or exercise capacity) typically observe significant changes by week 8.
• 3–6 months: The longer-arc benefits — improved body composition, cardiovascular markers, cognitive function — become measurable in longer-duration trials.

Important caveat: individual variation is substantial. Age, baseline NAD+ status, diet, exercise habits, and the specific supplement formulation all affect response time and magnitude. People who are significantly depleted tend to notice effects sooner than those who are starting from a relatively healthy baseline.

Frequently Asked Questions

Can you increase NAD+ levels through diet alone?

Diet can meaningfully support NAD+ levels through adequate niacin intake and polyphenol consumption. However, for adults over 40, diet alone is unlikely to fully compensate for the age-related decline in NAD+ synthesis efficiency. Clinical researchers studying NAD+ restoration in aging populations consistently use supplemental NAD+ precursors alongside dietary interventions.

What are the signs of low NAD+ levels?

Low NAD+ has no single diagnostic symptom, but patterns associated with suboptimal NAD+ include: persistent fatigue that isn’t resolved by adequate sleep, difficulty recovering from exercise, brain fog or reduced mental sharpness, low exercise tolerance, and slow wound healing. These symptoms overlap with many other conditions, so low NAD+ should not be assumed without proper evaluation.

Is it possible to take too much NAD+ precursor?

At very high doses, niacin causes flushing and, with chronic use, may affect liver enzymes. Niacinamide does not cause flushing but at extremely high doses (>3,000 mg/day) may cause gastrointestinal distress. NR and NMN have good safety profiles in trials up to 1,000–2,000 mg/day. Stick to formulas with clinically relevant but not excessive doses, and consult your healthcare provider if you have any liver conditions or take medications that affect liver metabolism.

Does exercise raise NAD+ levels?

Yes. Exercise — particularly high-intensity interval training and resistance training — is one of the most potent natural activators of NAMPT, the rate-limiting enzyme in the NAD+ salvage pathway. The NAD+-raising effects of exercise are well-documented in both animal and human studies, and the benefits are particularly pronounced in older adults.

Should I test my NAD+ levels before supplementing?

NAD+ blood testing is available through specialized labs and some functional medicine practitioners. However, testing is not required before supplementing. If you are over 40, the epidemiological evidence strongly suggests that your NAD+ levels are below where they were in your 20s — which is true for virtually everyone. The more important questions are which precursor to use, at what dose, and in what combination with other mitochondrial support nutrients.

How does intermittent fasting increase NAD+?

Fasting activates AMPK (because cellular energy levels drop) and suppresses mTOR. Both of these shift the metabolic balance toward NAD+ conservation and synthesis. AMPK directly stimulates NAMPT (increasing NAD+ production), while reduced mTOR activity decreases the energy-intensive protein synthesis that consumes NAD+. Short-term fasting also reduces the inflammatory burden that degrades NAD+ via CD38.

The Bottom Line

Raising NAD+ levels is one of the most well-supported strategies in contemporary longevity science. And unlike many longevity interventions, the tools available to do it — exercise, fasting, sleep optimization, dietary choices, and targeted supplementation — are accessible and evidence-based.

The most effective approach combines lifestyle foundations (exercise, sleep, fasting, heat exposure) with a dietary pattern rich in NAD+ precursors and sirtuin-activating polyphenols, supplemented with a comprehensive mitochondrial formula that addresses not just NAD+ but the full ecosystem of co-factors that determine how well your mitochondria actually perform.

Supplementing NAD+ in isolation is better than nothing. But combining it with the full complement of mitochondrial support nutrients is what the current science points toward for meaningful, sustained improvements in energy, resilience, and long-term cellular health.

If you want to explore a comprehensive approach, Advanced Mitochondrial Formula offers a 90-day money-back guarantee — a risk-free way to experience what full mitochondrial support feels like.

Medical Disclaimer: This article is for informational and educational purposes only and does not constitute medical advice. It should not be used to diagnose, treat, cure, or prevent any medical condition. Always consult a qualified healthcare provider before beginning any supplement regimen, particularly if you have a pre-existing condition or are taking prescription medications.

Sources: Trammell SAJ et al. (2016), Nature Communications; Yoshino M et al. (2021), Science; Elhassan YS et al. (2019), Cell Reports; Martens CR et al. (2020), Nature Communications; Irie J et al. (2020), NPJ Aging and Mechanisms of Disease; Bogan KL & Brenner C (2008), Annual Review of Nutrition; de Picciotto NE et al. (2016), Aging Cell.