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Blood Biomarkers
Jinfiniti Intracellular NAD® Test
Jinfiniti's Intracellular NAD® Test is the market-leading at-home test for measuring NAD levels directly inside your cells — not in plasma, which is what IV clinic readings capture. Founded in 2019 by Dr. Jin-Xiong She, a geneticist at Augusta University, the company now processes over 90% of all NAD tests worldwide. The test uses a finger-prick dried blood spot card, is processed in Jinfiniti's CLIA-certified lab in Augusta, Georgia, and returns results in 3–7 business days. For anyone actively supplementing with NMN or NR — or considering it — this is the only validated way to know whether those supplements are actually working at the cellular level.
MYM score
7.8
Biomarker depth 26%
6.5
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Markers measured1 (intracellular NAD+)
Measurement typeIntracellular (inside red blood cells)
Result formatNumeric level + personalized dosage guidance
What it missesNADH ratio, CD38, NAMPT activity, NAD precursors
This test measures exactly one thing, and it measures it exceptionally well. The intracellular distinction matters enormously: plasma NAD doesn't reflect cellular NAD status, and most people getting IV NAD infusions are paying for a temporary plasma spike that doesn't improve intracellular levels. The score is constrained because a single biomarker — however well-measured — limits clinical picture. Context from an inflammation panel or metabolic workup would sharpen the interpretation.
Scientific validity 22%
8.8
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Lab certificationCLIA-certified (Augusta, GA)
Reproducibility (CV)3.1% — clinically excellent
Market position>90% of all NAD tests globally
Clinical endorsementRecommended by 2,000+ doctors
Underlying scienceWell-established; 10,000+ NAD+ publications
CLIA certification is not marketing language — it's the same regulatory standard applied to clinical diagnostic labs used by hospitals. A CV of 3.1% is tight enough to detect meaningful changes from supplementation over time. The broader NAD+ science has substantial peer-reviewed support. The one caveat: Jinfiniti's specific reference ranges and "optimal" thresholds haven't been defined by an independent published population study, so the interpretation guidance rests partly on Jinfiniti's own clinical data.
Actionability 22%
8.5
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Supplement dosage guidanceYes — personalized to your result
Re-test protocolRecommended at 6–8 weeks post-supplementation
Webinar accessIncluded — Dr. She's NAD optimization sessions
Expert consultationIncluded with membership; available separately
Physician-shareableYes — standard clinical report format
Actionability is the strongest argument for this test. Knowing your NAD level without guidance would be like knowing your LDL without a reference range. Jinfiniti delivers personalized dosage recommendations, not generic advice, and the before/after re-test framework makes it possible to close the loop on whether your NMN or NR supplement is working. Small knock for the upsell pressure toward their own supplements, which are sold at a premium.
Value 17%
7.2
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Single test price$198
Pack of 4$673 (15% off)
Membership (month 1)$158 (2 tests + supplement)
Membership ongoing$88/month (supplement only)
Annualized cost (yr 1, single)$396 (2 tests, baseline + follow-up)
$198 per test is steep for a single biomarker, but the comparison set matters. Functional medicine labs typically charge $150–$300 for NAD testing if they offer it at all, and many don't. The membership entry at $158 for two tests is good value if you intend to test before and after supplementation — which you should. Watch the ongoing membership structure: the $88/month supplement subscription can add up if you're not actively using their Vitality Booster. The 60-day money-back guarantee (tests excluded) is noted.
⚠ Note: The "regular price" shown as $792 for a pack of 4 appears inflated vs. the actual $198/test single price — a common pricing optics pattern worth flagging to readers.
Experience 13%
8.0
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Sample collectionFinger-prick dried blood spot
Turnaround3–7 business days after receipt
Results portalOnline dashboard (jinfiniti.com)
Customer rating4.9 / 5 · 35 verified reviews on-site
ShippingFree above $200; US only for return
The dried blood spot process is simpler than a full venipuncture and doesn't require a lab visit, but the finger-prick can be challenging for some people — warmth and proper positioning matter. Results turnaround of 3–7 days is fast by DTC standards. The online portal is functional. Minor knock for the US-only return shipping restriction and the recommendation to use FedEx Express for faster processing (adds out-of-pocket cost not called out in the base price).
The intracellular distinction is what makes this test worth having.
NAD exists in two distinct compartments — inside cells (intracellular) and in blood plasma. IV NAD infusions, which can cost $300–$1,000 per session at longevity clinics, temporarily raise plasma NAD but have minimal impact on intracellular levels, where the actual cellular energy and DNA repair work happens. Customer reviews on Jinfiniti's site directly document this: users who had been doing IV infusions discovered their intracellular levels hadn't moved. For anyone investing meaningfully in NAD supplementation — oral NMN, NR, or otherwise — a before-and-after intracellular test is the only honest feedback loop available.
Strengths & limitations
Strengths
+Only CLIA-certified intracellular NAD test available DTC — not plasma, not estimated
+3.1% CV is clinic-grade reproducibility; results are reliable enough to track change over time
+Personalized dosage recommendations — not just a number but what to do with it
+Proven at scale: 100,000+ customers, 90%+ of global NAD testing volume
+Before/after framework makes supplement ROI measurable
Limitations
−Measures only one biomarker — context from inflammation or metabolic markers requires separate testing
−$198/test; meaningful cost for a routine re-test cadence
−Membership structure creates ongoing supplement spend commitment
−Reference ranges and "optimal" thresholds are Jinfiniti-defined, not from an independent published population study
−US-only return shipping; international customers face added logistics
How to use your results
1.
Test before you start supplementing. If you're already taking NMN or NR, stop for at least 3–4 days before your baseline test to get a true starting point. This is the number you're trying to move, and it's meaningless if it's already influenced by your current stack.
2.
Use your result to calibrate dose, not to decide whether to supplement. Jinfiniti's report gives personalized dosage guidance based on where your levels fall. Someone in the low range may need 1,000–2,000mg NMN daily; someone mid-range may respond to 500mg. Don't just pick the highest dose assuming more is better — testing is the point.
3.
Re-test at 6–8 weeks, not sooner. NAD levels respond to supplementation gradually. Testing at 2 weeks gives noisy data. The 6–8 week mark is when you'll see a meaningful signal. If your levels haven't improved at 8 weeks, it's a product or dose problem — not a waiting problem.
4.
Don't assume IV NAD is working. If you're getting IV infusions at a longevity clinic, test before and after a round. Multiple Jinfiniti customers discovered — after months of expensive infusions — that their intracellular levels were unchanged. The plasma spike from IV is real; the intracellular benefit is not reliably there.
5.
Factor CD38 if your levels remain low despite high-dose supplementation. CD38 is an enzyme that degrades NAD, and it rises with chronic inflammation and aging. If you're supplementing aggressively but levels aren't climbing, consider an inflammation panel. Quercetin and apigenin are often cited as CD38 inhibitors, though evidence for intracellular NAD impact specifically is limited — share results with a functional medicine provider who can evaluate the full picture.
How it compares
| Option | What it measures | Method | Turnaround | Cost |
|---|---|---|---|---|
| Jinfiniti NAD® Test This review | Intracellular NAD+ | Finger-prick DBS | 3–7 days | $198/test |
| IV NAD infusion (clinic) | Raises plasma NAD (not intracellular) | IV drip, clinic visit | Same day (treatment) | $300–$1,000/session |
| Function Health | 160+ biomarkers (NAD not included) | Blood draw | Days | $499/yr |
| Genova NutrEval | Nutritional status incl. NAD precursors (indirect) | Blood + urine | 10–14 days | $300–$500 (practitioner) |
| Standard metabolic panel | Does not include NAD | Blood draw | 1–3 days | $20–$50 |
MYM verdict
"If you're spending money on NMN, NR, or IV NAD therapy, you should test — and this is the only test that actually measures what matters. Jinfiniti's CLIA certification, clinical-grade reproducibility, and market dominance give it credibility that no other DTC NAD product can match right now. At $198 a test the economics make most sense as a before/after pair; use the membership deal to get both tests at a significant discount, then cancel if you're not continuing with their supplements."