NAD+ Bloodwork Guide: What to Track and Why

NAD+ supplementation targets some of the deepest metabolic machinery in your cells — mitochondrial energy production, DNA repair, sirtuin activation, and insulin signaling. Judging results by "I feel more energetic" is a start, but it misses the metabolic shifts that actually matter for long-term health.

Bloodwork gives you the objective picture. This guide covers exactly which labs to run, when to run them, what the numbers mean, and what optimal ranges look like for high performance — not just "normal."

The Testing Timeline

Baseline (before starting): Run all the tests below that match your goals, 1-2 weeks before your first dose. This is your reference point. Everything gets compared to this.

Mid-protocol check (week 6-8): Retest metabolic markers (fasting glucose, insulin) and inflammatory markers (hs-CRP). This is where the published trial data shows earliest measurable changes.

Post-protocol (week 10-12 or 2-4 weeks after finishing a cycle): Retest everything you ran at baseline. This tells you what changed and what persists.

What "full panel" means in this guide: Fasting glucose, fasting insulin, HbA1c, hs-CRP, CBC, CMP (includes liver enzymes), and lipid panel as a minimum. Add fasting lactate and uric acid if mitochondrial function is your primary goal. The specifics are all covered below.

Biomarkers at a Glance

Click any bar to jump to the full breakdown.

Tier 1: Metabolic Markers

NAD+ directly impacts cellular energy metabolism through mitochondrial ETC function and sirtuin-mediated insulin signaling. These markers capture the metabolic improvements that published human trials have demonstrated.

Fasting Glucose

What it measures: Blood sugar levels after an overnight fast. Reflects how well your body manages glucose at rest.

Why it matters for NAD+: NAD+ activates SIRT1, which improves insulin signaling in muscle and liver. Declining NAD+ impairs glucose handling. Yoshino et al. (2021) showed NMN improved muscle insulin sensitivity in prediabetic women (Yoshino et al., 2021).

High-performance target: 72-85 mg/dL. Anything above 90 in a fasted state suggests early insulin resistance that NAD+ may help address.

Fasting Insulin

What it measures: How much insulin your pancreas produces to manage baseline blood sugar. High fasting insulin = your cells are resisting insulin's signal, so the pancreas produces more.

Why it matters: Fasting insulin is often abnormal years before fasting glucose rises. It's the earlier warning signal for metabolic dysfunction. NAD+-mediated SIRT1 activation directly improves insulin signaling.

HOMA-IR (Calculated)

What it measures: Insulin resistance, calculated from fasting glucose and fasting insulin: (glucose × insulin) ÷ 405.

Why it matters: HOMA-IR is the single best marker for insulin sensitivity that you can get from a standard blood draw. NAD+ improves this through dual mechanisms — better mitochondrial energy production and SIRT1-mediated insulin signaling improvement.

How to track: Calculate from your fasting glucose and fasting insulin. No separate test needed.

HbA1c

What it measures: Average blood sugar over the past 2-3 months, measured as the percentage of hemoglobin that's glycated (sugar-coated).

Why it matters: HbA1c captures long-term glucose trends that a single fasting glucose measurement can miss. It's the most widely used marker for metabolic health assessment.

Note: HbA1c takes 8-12 weeks to reflect changes due to the lifespan of red blood cells. Don't expect movement at the 4-6 week mark.

Tier 2: Inflammation and Aging Markers

NAD+ reduces inflammation through sirtuin-mediated suppression of NF-κB signaling. Chronic low-grade inflammation ("inflammaging") both consumes NAD+ (via PARP activation) and is worsened by NAD+ depletion — a vicious cycle that supplementation aims to break.

High-Sensitivity C-Reactive Protein (hs-CRP)

What it measures: Systemic inflammation. CRP is produced by the liver in response to inflammatory signals throughout the body.

Why it matters for NAD+: SIRT1 and SIRT6 directly suppress NF-κB, the master inflammatory transcription factor. As NAD+ levels rise and sirtuin activity increases, inflammatory signaling should decrease. hs-CRP is your broadest single measure of this effect.

High-performance target: Below 0.5 mg/L. Many longevity practitioners consider anything above 1.0 as something to address.

Fasting Lactate

What it measures: Blood lactate at rest — a marker of mitochondrial function and metabolic efficiency.

Why it matters: When mitochondria are impaired (low NAD+), cells shift toward glycolysis, producing more lactate even at rest. Elevated fasting lactate suggests mitochondrial dysfunction. As NAD+ restores ETC function, resting lactate should decrease.

How to test: Requires a specific lactate test, not included in standard panels. Available at most labs as an add-on.

Uric Acid

What it measures: A byproduct of purine metabolism. NAD+ breakdown produces nicotinamide, which feeds into pathways that can affect uric acid levels.

Why it matters: Some NAD+ precursor studies have noted transient uric acid elevations. Monitoring ensures levels stay in range, especially in individuals with gout history or hyperuricemia risk.

Tier 3: Mitochondrial and Energy Markers

These markers help assess whether NAD+'s core mechanism — improving mitochondrial function — is translating to measurable changes.

Lactate Dehydrogenase (LDH)

What it measures: An enzyme involved in converting lactate to pyruvate and vice versa. Elevated LDH indicates increased anaerobic metabolism or tissue damage.

Why track it: LDH works alongside lactate to paint a picture of metabolic efficiency. Improving mitochondrial function via NAD+ should reduce reliance on anaerobic pathways and lower baseline LDH.

GDF-15 (Growth Differentiation Factor 15)

What it measures: A stress-response cytokine produced by mitochondria under stress. Increasingly recognized as a biomarker of biological aging and mitochondrial dysfunction.

Why track it: GDF-15 is emerging as one of the most robust aging biomarkers. It correlates with all-cause mortality and captures mitochondrial stress that other markers miss. As NAD+ improves mitochondrial function, GDF-15 may decrease.

How to test: Specialty test — not available on standard panels. Available through some functional medicine and longevity clinics. Worth tracking if you can access it.

8-OHdG (Urinary)

What it measures: 8-hydroxy-2'-deoxyguanosine — a marker of oxidative DNA damage. When NAD+ fuels PARP-mediated DNA repair, oxidative DNA damage markers should decrease.

How to test: Urinary test, available through specialty labs. Best measured as ng/mg creatinine for accurate comparison across time points.

Tier 4: General Health Safety Panel

These won't tell you if NAD+ is "working," but they make sure it's not causing problems. Run these at baseline and post-protocol.

Complete Blood Count (CBC)

Checks red blood cells, white blood cells, and platelets. Establishes that your immune system and oxygen-carrying capacity are functioning normally. No specific changes expected from NAD+ — this is safety monitoring.

Comprehensive Metabolic Panel (CMP)

Covers 14 markers in one test: liver enzymes (ALT, AST), kidney function (BUN, creatinine), electrolytes, blood glucose, and protein levels.

Liver enzymes matter most here:

Standard lab ranges go up to 40 U/L for ALT, but optimal is below 25. AST follows the same pattern. GGT below 20 U/L is ideal.

Why track them: NAD+ is metabolized through multiple pathways, and the liver plays a central role. While NAD+ supplementation has not shown hepatotoxicity in published trials, monitoring liver enzymes is standard practice for any supplement protocol.

Lipid Panel

Total cholesterol, LDL, HDL, and triglycerides. NAD+ improves metabolic function through sirtuin activation, which can positively affect lipid metabolism. SIRT1 enhances fatty acid oxidation and improves HDL function.

Other lipid targets for high performance: HDL above 60 mg/dL, ApoB below 80 mg/dL, total cholesterol/HDL ratio below 3.5.

How to Order Labs

You don't necessarily need a doctor's visit for every test:

• Direct-to-consumer labs: HealthLabs.com lets you order bloodwork without a prescription or insurance. Order online, walk into any of 4,500+ LabCorp or Quest draw sites, and get results in 1-2 business days.
• Your primary care doctor: If you have a good relationship with your doctor, ask them to add these to your regular bloodwork. Many insurance plans cover fasting glucose, HbA1c, CBC, and CMP as preventive care.
• Functional medicine practitioners: Best option if you want specialty testing (GDF-15, 8-OHdG, fasting lactate). They typically use labs like Genova, Boston Heart, or Cleveland HeartLab.

Budget-conscious approach: If you can only afford a few tests, prioritize in this order:

1. Fasting glucose + fasting insulin (about $30-50 direct — gives you HOMA-IR)
2. hs-CRP (about $15-30 direct)
3. CBC + CMP (usually bundled for $20-40)
4. HbA1c (about $20-35)

Putting It All Together: Sample Protocol

Week -1 (Baseline): Run fasting glucose, fasting insulin, HbA1c, hs-CRP, CBC, CMP, lipid panel, and any goal-specific markers (lactate, uric acid, GDF-15). This is your "before" snapshot.

Weeks 1-6 (NAD+ protocol): Focus on subjective tracking — energy levels, sleep quality, exercise recovery, cognitive function. Journal it daily.

Week 6-8 (Mid-protocol): Retest fasting glucose, fasting insulin (calculate HOMA-IR), and hs-CRP. These are the markers most likely to shift first. If HOMA-IR improved (e.g., from 2.1 to 1.3), the protocol is working metabolically.

Week 10-12 (Post-protocol or end of cycle): Retest everything you ran at baseline. Compare each marker to your starting numbers. HbA1c will only now reflect the full protocol period.

What to do with results: If metabolic markers improved, you have evidence the protocol is working. If they didn't budge, consider: was the dose sufficient? Was the protocol long enough? Are foundational factors (diet, sleep, exercise) supporting the supplementation?

Related Reading

• NAD+ Dosing Guide — protocols for SC, IV, sublingual, and oral precursors
• NAD+ Reconstitution Guide — step-by-step mixing and dilution charts
• NAD+ Benefits — what the research shows
• NAD+ Results Timeline — week-by-week expectations
• SS-31 Bloodwork Guide — mitochondrial biomarkers (complements NAD+ panel)
• MOTS-c Dosing Guide — metabolic peptide often stacked with NAD+

References

1. Yoshino, M., et al. (2021). Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women. Science, 372(6547), 1224-1229. PubMed
2. Martens, C.R., et al. (2018). Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults. Nature Communications, 9(1), 1286. PubMed
3. Massudi, H., et al. (2012). Age-associated changes in oxidative stress and NAD+ metabolism in human tissue. PLoS One, 7(7), e42357. PubMed
4. Imai, S. & Guarente, L. (2014). NAD+ and sirtuins in aging and disease. Trends in Cell Biology, 24(8), 464-471. PubMed
5. Grant, R., et al. (2019). A pilot study investigating changes in the human plasma and urine NAD+ metabolome during a 6 hour intravenous infusion of NAD+. Front Aging Neurosci, 11, 257. PubMed

This guide is for educational and informational purposes only. It is not medical advice. NAD+ supplementation is not FDA-approved for any anti-aging indication. The biomarker ranges described here reflect optimization targets used in functional and longevity medicine — they are not diagnostic criteria. Lab results should be interpreted by a qualified healthcare provider in the context of your full medical history. The Peptide Catalog is not responsible for medical decisions made based on information presented here. HealthLabs.com links are affiliate links — we may earn a commission at no additional cost to you.