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Comprehensive Guide
Nicotinamide adenine dinucleotide is a coenzyme in every living cell, powering 500+ enzymatic reactions — from mitochondrial energy production to DNA repair to sirtuin-mediated longevity signaling. NAD+ declines ~50% by age 60. Here is everything you need to know about restoring it.
500+
Enzymatic reactions requiring NAD+
~50%
NAD+ decline by age 60
7
Sirtuin family members
5
NAD+ precursors compared
The Fundamentals
Nicotinamide adenine dinucleotide is not a supplement trend — it is a fundamental molecule of life, present in every cell of every living organism.
NAD+ (nicotinamide adenine dinucleotide) exists in two forms: NAD+ (oxidized) and NADH (reduced). This redox pair is the central electron carrier in cellular metabolism. In the mitochondria, NAD+ accepts electrons from the breakdown of glucose and fatty acids (glycolysis, beta-oxidation, the TCA cycle), becoming NADH. NADH then donates those electrons to the electron transport chain, driving ATP production — the energy currency of life. Without NAD+, your cells cannot convert food into energy. Period.
NAD+ is not just an electron shuttle. It is a consumed substrate for three critical families of signaling enzymes:
Sirtuins (SIRT1-7)
NAD+-dependent deacetylases that regulate gene expression, DNA repair, inflammation, metabolism, and aging. Often called the "longevity genes." Each deacetylation reaction consumes one NAD+ molecule.
PARPs (PARP1/2)
DNA damage sensors that use NAD+ to build poly-ADP-ribose repair signals. PARP1 is the single largest NAD+ consumer — a single DNA break can trigger consumption of 100-150 NAD+ molecules.
CD38 / CD157
NADase enzymes that cleave NAD+ to generate calcium signaling molecules. CD38 expression rises with age and inflammation — it is now recognized as the primary driver of age-related NAD+ decline.
A 2019 review in Nature Metabolism (Katsyuba et al.) catalogued over 500 enzymatic reactions requiring NAD+ as a cofactor or substrate. These span energy metabolism (glycolysis, TCA cycle, oxidative phosphorylation, fatty acid oxidation), redox defense (glutathione recycling, thioredoxin system), epigenetic regulation (histone deacetylation by sirtuins), DNA repair (PARP-mediated), circadian rhythm (CLOCK:BMAL1 regulation of NAMPT), immune function, and neurotransmitter synthesis. No other single molecule participates in as many biological processes. This is why NAD+ decline affects virtually every organ system simultaneously.
The Problem
NAD+ levels drop steadily across the lifespan — and the consequences touch every system in the body.
Multiple human studies have quantified the decline:
By Age 40
~20-30% decline
Subtle — may manifest as decreased exercise recovery, mild fatigue, early metabolic changes.
By Age 60
~50% decline
Significant — mitochondrial dysfunction, impaired DNA repair, increased inflammation, visible aging acceleration.
By Age 80
~65-80% decline
Severe — strongly correlated with age-related diseases: neurodegeneration, sarcopenia, cardiovascular disease, metabolic syndrome.
Increased CD38 Expression (Primary Driver)
CD38 expression rises dramatically with age, driven by senescent cell accumulation and chronic low-grade inflammation (inflammaging). CD38 on the surface of immune cells and in intracellular compartments degrades NAD+, NMN, and NR. Camacho-Pereira et al. (2016) demonstrated that CD38 knockout mice maintain youthful NAD+ levels into old age.
Decreased NAMPT Expression
NAMPT (nicotinamide phosphoribosyltransferase) is the rate-limiting enzyme in the NAD+ salvage pathway — the primary route of NAD+ recycling. NAMPT expression declines with age, reducing the cell's ability to recycle nicotinamide back into NAD+. Since 85% of cellular NAD+ comes from the salvage pathway, this decline is significant.
Increased PARP Activation (DNA Damage Accumulation)
As DNA damage accumulates with age (from oxidative stress, UV, environmental toxins), PARP1 is chronically activated, consuming large quantities of NAD+ for repair. This creates a vicious cycle: DNA damage depletes NAD+, which impairs sirtuin-mediated repair pathways, leading to more unrepaired damage and more PARP activation.
The Pathways
There are three distinct biosynthetic routes to NAD+ — understanding them is essential for choosing the right precursor strategy.
The salvage pathway recycles nicotinamide (NAM) — the byproduct of NAD+ consumption by sirtuins, PARPs, and CD38 — back into NAD+.
NAMPT is the rate-limiting enzyme. NMN and NR supplements feed directly into this pathway. This is the dominant route of NAD+ production in most tissues.
This pathway converts dietary niacin (nicotinic acid) into NAD+ through a three-step process independent of the salvage pathway.
The Preiss-Handler pathway is particularly important in the liver and kidney. Using niacin alongside NMN or NR provides multi-pathway NAD+ boosting — a strategy that may be more robust than single-precursor approaches.
The de novo pathway synthesizes NAD+ from the essential amino acid tryptophan through the kynurenine pathway. This is an 8-step process and is the least efficient route.
Only 1-2% of dietary tryptophan is converted to NAD+. This pathway becomes more active during inflammation (when IDO is upregulated), but kynurenine pathway intermediates can be neurotoxic. Not a practical supplementation target for NAD+ boosting.
The Longevity Genes
Seven enzymes that depend on NAD+ to regulate aging, metabolism, DNA repair, and inflammation. No NAD+ means no sirtuin activity.
Nucleus / Cytoplasm
Deacetylates histones and transcription factors (p53, FOXO, PGC-1alpha, NF-kB). Master regulator of metabolic adaptation to caloric restriction. Promotes fat oxidation, mitochondrial biogenesis, DNA repair, and anti-inflammatory signaling. The most studied sirtuin for longevity.
Key finding: Overexpression in mice extends healthy lifespan and improves metabolic health (Bordone et al., 2007). Activated by caloric restriction and NAD+ elevation.
Cytoplasm
Regulates cell cycle progression, adipocyte differentiation, and myelination in the nervous system. Deacetylates alpha-tubulin. Plays a role in genome stability during cell division.
Key finding: Involved in neurodegenerative disease pathology. SIRT2 inhibition shows neuroprotective effects in some Parkinson's disease models (Outeiro et al., 2007).
Mitochondria
The primary mitochondrial deacetylase. Regulates oxidative phosphorylation, fatty acid oxidation, the TCA cycle, and mitochondrial ROS defense (activates SOD2). Critical for mitochondrial protein quality control.
Key finding: SIRT3 knockout mice develop accelerated aging, hearing loss, and metabolic syndrome. Exercise robustly increases SIRT3 expression (Lombard et al., 2007).
Mitochondria
Regulates amino acid metabolism and insulin secretion. ADP-ribosylates glutamate dehydrogenase, controlling amino acid-stimulated insulin secretion. Tumor suppressor — represses glutamine metabolism in cancer cells.
Key finding: SIRT4 loss promotes tumor growth through dysregulated glutamine metabolism (Jeong et al., 2013).
Mitochondria
Removes succinyl, malonyl, and glutaryl modifications from mitochondrial proteins. Regulates urea cycle, fatty acid oxidation, and ketone body production. Less studied than SIRT1/3 but emerging as critical for metabolic flexibility.
Key finding: SIRT5 desuccinylation regulates over 1,000 mitochondrial proteins (Rardin et al., 2013).
Nucleus
Maintains telomere integrity, promotes DNA double-strand break repair (via deacetylation of H3K9 and H3K56), regulates glucose homeostasis, and suppresses NF-kB-driven inflammation. One of the most directly linked sirtuins to lifespan.
Key finding: SIRT6 overexpression extends male mouse lifespan by 15%. SIRT6 knockout mice die within 4 weeks from accelerated aging (Kanfi et al., 2012).
Nucleolus
Regulates ribosomal RNA transcription and the cellular stress response. Deacetylates H3K18 to repress gene expression. Plays a role in DNA repair at ribosomal DNA and maintains genome stability in the nucleolus.
Key finding: SIRT7 knockout mice develop cardiac hypertrophy and inflammatory cardiomyopathy (Vakhrusheva et al., 2008).
The critical takeaway: Sirtuins cannot function without NAD+. As NAD+ declines with age, sirtuin activity decreases proportionally — leading to impaired DNA repair, increased inflammation, metabolic dysfunction, and accelerated aging. Restoring NAD+ levels reactivates sirtuin signaling. This is the core thesis of NAD+ longevity research.
The Demand Side
NAD+ is not just used — it is destroyed in the process. Understanding NAD+ consumers is as important as understanding production.
Sirtuins are NAD+-dependent deacetylases that cleave NAD+ to remove acetyl groups from proteins, producing nicotinamide (NAM) as a byproduct. Each deacetylation reaction consumes one molecule of NAD+. The more active your sirtuins, the more NAD+ is consumed — creating a direct link between longevity signaling and NAD+ demand.
PARPs are the largest NAD+ consumers in the cell. PARP1 detects DNA single-strand breaks and uses NAD+ to build poly-ADP-ribose (PAR) chains that signal repair machinery. Each DNA damage event can consume 100-150 molecules of NAD+. PARP1 hyperactivation during severe DNA damage can deplete cellular NAD+ to near-zero, triggering cell death (parthanatos).
CD38 is a transmembrane glycoprotein and the primary NADase on the cell surface and in intracellular compartments. It cleaves NAD+ into nicotinamide and ADP-ribose (or cyclic ADP-ribose, a calcium signaling molecule). CD38 expression increases dramatically with age and chronic inflammation — and this is now recognized as the dominant driver of age-related NAD+ decline. CD38 can degrade NAD+, NMN, and NR.
SARM1 is an NAD+-cleaving enzyme activated during axonal injury and neurodegeneration. When a neuron is damaged, SARM1 triggers rapid NAD+ depletion in the axon, leading to Wallerian degeneration (axon death). SARM1 is increasingly recognized as a drug target for neuroprotection in traumatic brain injury, ALS, and peripheral neuropathy.
Want This Personalized?
This guide gives you the science. A CryoCove coach gives you the personalization — the right dose, timing, and integration with your other 8 pillars.
Head-to-Head
Five precursors, three biosynthetic pathways, and very different evidence profiles. Here is the honest comparison.
Dose
250-1,000mg/day
Bioavailability
Moderate — oral absorption via Slc12a8 transporter in the gut; some conversion to NR before absorption
Evidence
Strong preclinical (mice show reversal of age-related decline); growing human clinical trial data (Yi et al. 2023 — 250mg/day for 60 days raised blood NAD+ 38%); Sinclair's primary recommended precursor
Pros
Cons
Yi et al., GeroScience, 2023; Grozio et al., Nature Metabolism, 2019
Dose
300-1,000mg/day
Bioavailability
Good — efficiently absorbed orally; converted to NMN intracellularly by NRK1/NRK2 kinases, then to NAD+
Evidence
Strongest human clinical data among NAD+ precursors; Martens et al. 2018 showed NR raised blood NAD+ 60% in healthy older adults; multiple completed RCTs
Pros
Cons
Martens et al., Nature Communications, 2018; Trammell et al., Nature Communications, 2016
Dose
50-500mg/day (higher doses for lipid management under medical supervision)
Bioavailability
High — rapidly absorbed; converted to NAD+ via the Preiss-Handler pathway (NA to NAAD to NAD+)
Evidence
Decades of clinical use for lipid management; Elhassan et al. showed niacin increases muscle NAD+ in humans; the oldest and cheapest NAD+ precursor
Pros
Cons
Elhassan et al., Cell Reports, 2019; Katsyuba et al., Nature Metabolism, 2020
Dose
250-500mg/day
Bioavailability
High — rapidly absorbed; enters the salvage pathway directly via NAMPT (the rate-limiting enzyme)
Evidence
Common in multivitamins; raises NAD+ at low doses but inhibits sirtuins and PARPs at high doses — a critical paradox
Pros
Cons
Bitterman et al., Journal of Biological Chemistry, 2002; Mitchell et al., 2018
Dose
Dietary (1-2g/day from food); not typically supplemented for NAD+
Bioavailability
Low conversion to NAD+ — the de novo pathway (kynurenine pathway) is inefficient, converting only 1-2% of tryptophan to NAD+
Evidence
The de novo pathway is a minor contributor to NAD+ pools under normal conditions; becomes more relevant during inflammation when IDO/TDO enzymes are upregulated
Pros
Cons
Badawy, International Journal of Tryptophan Research, 2017
| Precursor | Pathway | Steps to NAD+ | Human RCTs | Cost | Tier |
|---|---|---|---|---|---|
| NMN | Salvage | 1 | Growing (5+) | $$$$ | A |
| NR | Salvage | 2 | Strong (10+) | $$$ | A |
| Niacin (NA) | Preiss-Handler | 3 | Extensive (lipids) | $ | B |
| Niacinamide | Salvage | 2 | Limited (NAD+ focus) | $ | C |
| Tryptophan | De Novo | 8+ | N/A (dietary) | Free | C |
The Science & The Hype
Separating the robust peer-reviewed science from the marketing claims and financial conflicts.
The CryoCove Position
The NAD+ decline theory of aging is supported by strong evidence. NAD+ precursors reliably raise NAD+ levels. Whether this translates to meaningful human longevity extension is not yet proven by large-scale clinical trials. In the meantime, NAD+ supplementation has a favorable safety profile, and — critically — the lifestyle interventions that boost NAD+ (exercise, fasting, cold exposure, sleep, circadian alignment) have independent, well-proven health benefits regardless of their effect on NAD+. Start with lifestyle. Add supplements if you want the extra edge. Do not expect miracles from a pill.
Clinical Option
Intravenous NAD+ infusions are growing in popularity at longevity clinics. Here is an honest assessment.
Bottom line: For most people, daily oral NMN or NR supplementation combined with lifestyle optimization is more practical, more sustainable, and likely as effective for long-term NAD+ maintenance. IV therapy may have a role for acute situations or as an initial kickstart, but it is not necessary for a comprehensive NAD+ protocol.
Free & Powerful
These interventions boost NAD+ through multiple pathways simultaneously — and they are free. No supplement can replace them.
Fasting increases NAMPT (the rate-limiting enzyme in the NAD+ salvage pathway) expression by 50-100%. When energy is scarce, cells upregulate NAD+ biosynthesis to activate sirtuins and shift metabolism toward fat oxidation and mitochondrial efficiency. Time-restricted eating (16:8 or 18:6) provides meaningful NAMPT activation without extreme caloric restriction.
Nakahata et al., Science, 2009; Ramsey et al., Science, 2009
Protocol
16-18 hour overnight fast, 3-5 days per week. Break fast with protein-rich meal. Ensure adequate total caloric intake on eating days.
Exercise activates AMPK, which upregulates NAMPT and increases NAD+ synthesis. High-intensity exercise is particularly effective — a single HIIT session can increase skeletal muscle NAD+ by 20-50%. Resistance training activates SIRT1 and SIRT3, driving mitochondrial biogenesis. Regular exercisers have significantly higher baseline NAD+ levels than sedentary individuals.
Costford et al., Cell Metabolism, 2010; de Guia et al., Aging Cell, 2019
Protocol
3-4x/week resistance training + 2x/week HIIT (20-30 min). Zone 2 cardio (30-60 min, 2-3x/week) for mitochondrial density. Consistency over intensity for long-term NAD+ maintenance.
Cold stress activates brown adipose tissue (BAT), which has exceptionally high NAD+ turnover due to intense mitochondrial uncoupling via UCP1. Cold exposure upregulates SIRT1 and SIRT3 in BAT and skeletal muscle, increases NAMPT expression, and activates AMPK. The norepinephrine release from cold (250-530% increase) also stimulates lipolysis, which feeds fatty acid oxidation — an NAD+-dependent process.
Yoneshiro et al., Journal of Clinical Investigation, 2013; Sramek et al., 2000
Protocol
2-5 min cold immersion at 40-55F (4-13C), 3-5x per week. Morning timing preferred for circadian alignment. 11+ total minutes of cold per week.
Heat stress activates heat shock proteins (HSP70, HSP90) and FOXO transcription factors, both of which are SIRT1 targets. Sauna use increases NAMPT expression in skeletal muscle and activates AMPK. The hormetic stress response from heat — like cold — triggers cellular defense pathways that demand and upregulate NAD+ production. Regular sauna use is associated with reduced all-cause mortality and improved cardiovascular markers.
Laukkanen et al., JAMA Internal Medicine, 2015; Haigis & Guarente, Genes & Development, 2006
Protocol
176-212F (80-100C) for 15-20 min, 3-4x per week. Contrast therapy (sauna + cold plunge) amplifies the hormetic stress response.
NAD+ levels oscillate on a circadian rhythm — peaking during waking hours and declining at night. This oscillation is driven by NAMPT, which is itself a clock-controlled gene regulated by CLOCK:BMAL1. Disrupted circadian rhythms (shift work, jet lag, irregular sleep) flatten NAD+ oscillation and reduce peak NAD+ levels. Morning light exposure, consistent meal timing, and regular sleep/wake cycles maintain robust NAD+ cycling.
Nakahata et al., Cell, 2009; Peek et al., Science, 2013
Protocol
Fixed wake time within 30 min window (7 days/week). Morning sunlight 10-20 min within 30 min of waking. Time-restricted eating aligned with daylight hours. Consistent bedtime.
During deep sleep (NREM Stage 3), the brain undergoes critical repair processes that consume NAD+ (via PARPs for DNA repair) and restore NAD+ pools (via the salvage pathway during the overnight fast). Chronic sleep deprivation reduces NAMPT expression, lowers NAD+ levels, and accelerates cellular aging. The glymphatic system, which clears metabolic waste during sleep, also relies on adequate NAD+-dependent energy metabolism.
Xie et al., Science, 2013; Peek et al., Science, 2013
Protocol
7-9 hours quality sleep. Cool room (60-67F). No screens 30-60 min before bed. Consistent sleep/wake times.
The CryoCove System
Every CryoCove wellness pillar intersects with NAD+ biology. Here is how each one connects.
Cold activates BAT, SIRT1/3, AMPK, and NAMPT — directly boosting NAD+ biosynthesis. Cold exposure also reduces CD38 expression via anti-inflammatory mechanisms.
Sauna activates heat shock proteins, FOXO factors, and AMPK — all of which increase NAD+ demand and production. Contrast therapy amplifies hormetic signaling.
Cyclic hyperventilation (Wim Hof, Tummo) creates transient hypoxia that activates HIF-1alpha and AMPK, both of which upregulate NAD+ salvage pathway enzymes.
HIIT and resistance training are the most potent lifestyle NAD+ boosters — they activate AMPK, increase NAMPT, and upregulate SIRT1/3 in skeletal muscle.
Deep sleep restores NAD+ pools, enables PARP-mediated DNA repair, and maintains circadian NAMPT oscillation. Sleep deprivation accelerates NAD+ decline.
Morning light sets CLOCK:BMAL1 cycling, which directly controls NAMPT expression and circadian NAD+ oscillation. Light is the master zeitgeber for NAD+ rhythm.
Adequate hydration supports mitochondrial function and enzymatic reactions that require NAD+. Dehydration impairs cellular metabolism and energy production.
Dietary NAD+ precursors (tryptophan, niacin from food), caloric restriction, and time-restricted eating all directly modulate NAD+ levels. Protein provides tryptophan and methyl donors.
Chronic stress increases CD38 expression (via inflammatory cytokines), accelerating NAD+ depletion. Meditation and stress management reduce inflammation and preserve NAD+ pools.
Your Protocol
Lifestyle first, supplements second, testing third. Here is the practical, evidence-based roadmap.
Lifestyle-first NAD+ optimization — no supplements required.
Layer in NAD+ precursors once lifestyle foundations are solid.
Fine-tune based on biomarkers and individual response.
Measure It
You can't optimize what you don't measure. NAD+ testing is now accessible to consumers.
| Test | Type | What It Measures | Cost |
|---|---|---|---|
| Jinfiniti Intracellular NAD+ | Dried blood spot (at-home) | Intracellular NAD+ concentration; optimal reported as >40 micromolar | ~$150-200 |
| Research-grade LC-MS/MS | Blood draw (clinical) | Precise NAD+ and metabolite quantification; gold standard | $300-500+ |
| Whole blood NAD+ (various labs) | Blood draw | Total blood NAD+; less specific than intracellular | $100-300 |
Baseline
Before starting protocol
Test before any NAD+ supplementation or lifestyle changes to establish your personal baseline.
3-Month Check
After Phase 1 + 2
Retest after implementing lifestyle changes and supplementation. Expect 30-90% increase from baseline.
6-Month Optimization
Full protocol assessment
Adjust dosing, add CD38 inhibitors, or modify lifestyle factors based on your individual response curve.
Common Questions
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every living cell, involved in over 500 enzymatic reactions. It exists in two forms: NAD+ (oxidized, active) and NADH (reduced). NAD+ is essential for mitochondrial energy production (converting food into ATP via the electron transport chain), DNA repair (via PARPs), epigenetic regulation (via sirtuins), and cellular signaling. NAD+ levels decline approximately 50% between ages 40 and 60. This decline is now considered a hallmark of aging — driving mitochondrial dysfunction, impaired DNA repair, increased inflammation, and metabolic disease. Restoring NAD+ levels is a primary target of longevity research.
Both NMN and NR effectively raise NAD+ levels in humans, and the honest answer is that we do not yet have a definitive head-to-head winner from large clinical trials. NMN is one enzymatic step closer to NAD+ (NMN to NAD+ via NMNAT), while NR requires two steps (NR to NMN to NAD+). NR has more published human clinical trial data and clear regulatory status (GRAS). NMN has stronger preclinical data and is David Sinclair's recommendation. Both are reasonable choices. The practical advice: pick one, take it consistently, and focus more energy on the lifestyle factors (exercise, fasting, sleep, cold exposure) that amplify NAD+ production through multiple pathways simultaneously.
NAD+ IV infusions (typically 250-500mg over 2-4 hours) bypass digestion and deliver NAD+ directly into the bloodstream. Users report acute improvements in energy, mental clarity, and well-being — though rigorous placebo-controlled trials are limited. The downsides: cost ($250-1,000+ per session), time (2-4 hours in a clinic), discomfort (nausea, chest tightness, and flushing are common during infusion), and the transient nature of the boost (NAD+ is rapidly metabolized). For most people, daily oral precursors (NMN or NR) combined with lifestyle optimization provide sustained NAD+ elevation at a fraction of the cost. IV therapy may have a role for acute situations (recovery from illness, jet lag, or initial kickstart) but is not necessary for long-term NAD+ maintenance.
Multiple studies show NAD+ levels decline approximately 1-2% per year starting in the 30s, resulting in roughly a 50% decline by age 60. The primary driver is increased CD38 expression (an NADase enzyme that rises with chronic inflammation) rather than decreased production. You can test intracellular NAD+ levels through specialized labs — Jinfiniti's Intracellular NAD+ Test is currently the most accessible consumer option, using a dried blood spot to measure NAD+ within cells (not just plasma). Optimal intracellular NAD+ is reported as above 40 micromolar. Testing at baseline, then at 3 and 6 months after starting a protocol, allows you to track your individual response.
CD38 is a transmembrane enzyme that degrades NAD+, NMN, and NR. It is now considered the primary driver of age-related NAD+ decline — more impactful than decreased production. CD38 expression increases with age and chronic inflammation (driven by senescent cells and inflammatory cytokines like TNF-alpha and IL-6). Reducing CD38 activity is arguably as important as supplementing NAD+ precursors. Natural CD38 inhibitors include apigenin (found in parsley, chamomile, celery), quercetin (onions, apples, berries), and luteolin (peppers, celery). Reducing systemic inflammation through exercise, sleep, nutrition, and stress management also lowers CD38 expression. The combination of boosting NAD+ production (precursors + lifestyle) while reducing consumption (CD38 inhibition + anti-inflammatory strategies) is the most effective approach.
David Sinclair (Harvard Medical School) is the most prominent NAD+ and sirtuin researcher. His lab's work has been foundational — demonstrating that NAD+ decline drives aging in mice and that NMN supplementation can reverse many age-related deficits. However, legitimate controversies exist: (1) Resveratrol's sirtuin-activating mechanism has been debated since 2010, with some researchers questioning whether it directly activates SIRT1 or works through other pathways. (2) Sinclair's claims about his personal biological age reversal lack peer-reviewed validation. (3) He has financial ties to NAD+ supplement companies (Tru Niagen initially, then Metro Biotech for NMN), creating potential conflicts of interest. (4) Mouse results do not always translate to humans — many age-reversal findings in mice have not yet been replicated in human trials. The science of NAD+ in aging is real and robust. The hype around specific products and personal testimonials should be evaluated with appropriate skepticism. Focus on the peer-reviewed data, not the celebrity endorsements.
NAD+ Booster
Fasting upregulates NAMPT by 50-100%, directly boosting NAD+ production through the salvage pathway. Learn the protocols.
Circadian NAD+ Cycling
NAD+ oscillates on a 24-hour clock controlled by NAMPT and CLOCK:BMAL1. Master your circadian rhythm to optimize NAD+ cycling.
SIRT1/3 Activation
Cold exposure activates brown adipose tissue, AMPK, and sirtuins — directly boosting NAD+ biosynthesis and utilization.
CD38 Connection
Chronic inflammation drives CD38 expression — the #1 cause of age-related NAD+ depletion. Reducing inflammation preserves your NAD+ pools.
This guide gives you the science. A CryoCove coach designs your personalized protocol — selecting the right precursor, dosing based on your age and goals, integrating lifestyle boosters across all 9 pillars, and tracking your NAD+ levels over time to optimize your cellular health.