Vitamin B3 (Niacin and Nicotinamide)
The vitamin behind NAD and NADP, the coenzymes that power energy metabolism and DNA repair.
Consider this test if:
- Investigating a scaly, darkly pigmented rash on sun-exposed skin alongside diarrhea or neurologic symptoms
- Chronic malabsorption, carcinoid syndrome, or long-term isoniazid treatment that can deplete niacin
- Limited or restricted diet low in protein and B3-rich foods
- Checking B3 status before or during supplementation or prescription niacin therapy
- HSA/FSA eligible
- Typical results in 4-10 days · Reviewed by a real clinician
- Drawn at a CLIA/CAP-accredited lab near you ·
Pre-test considerations
No specific fasting is required. Because the result reflects recent intake, note any niacin or nicotinamide supplements, fortified foods, or prescription nicotinic acid, since these raise the measured level. The specimen must be frozen promptly after collection, so collection is handled at a lab.
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What this test is for
Vitamin B3 circulates as nicotinic acid (niacin) and nicotinamide, and this test measures both forms in serum or plasma. Nicotinamide is built into NAD and NADP, the coenzymes that hundreds of enzymes use to break down carbohydrates, fat, protein, and alcohol and to build fatty acids and cholesterol. Low levels point to deficiency, which can come from poor dietary intake, low tryptophan, malabsorption (Hartnup disease), carcinoid syndrome, or prolonged isoniazid use, and severe deficiency causes pellagra: dermatitis on sun-exposed skin, diarrhea, and neurologic symptoms such as apathy, fatigue, depression, and memory loss. The result reflects recent intake, so note any niacin or nicotinamide supplements, since nicotinic acid is also taken at higher doses as a cholesterol-lowering agent and will raise the measured level.
Biomarkers tested
Includes 2 biomarkers
- Specimen
- Serum or plasma
- Measures
- Mass concentration
- Specimen
- Serum or plasma
- Measures
- Mass concentration
What to expect
- 1 Book instantly
Click, book, done. Choose a convenient lab location near you. Transparent, up-front pricing.
- 2 Quick lab visit
Testing to fit your busy schedule, usually 15 minutes or less. Walk-in and appointments available.
- 3 Typical results in 4-10 days
Your results post straight to your dashboard as soon as the lab completes them.
- 4 Expert guidance
Included with Mito membership. A clinician reviews your results and your personalized action plan follows, with clear next steps.
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Members pay our cost on every test, with lab fees passed straight through. The full receipt is itemized, never padded.
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All for $9/month
Order any test or consult without joining. For $9/month, members unlock member prices, trend tracking, and year-round clinician guidance.
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Frequently asked questions
View all FAQsHow does pricing work?
Every test shows the member price next to the standard non-member price, so you can see what membership saves you. The member price is our cost — covering the lab and what it takes to run the service — never a profit on the test itself; Mito makes its money on the $9 membership, not on marking up your tests. Membership is $9/mo, and you still pay the lab’s order fee. Prices are itemized before you pay, with no hidden fees.
Where do I get tested?
Choose a partner lab (Quest, Labcorp, or BioReference) at checkout. If your cart spans multiple tests, we consolidate the whole order onto a single lab so you only make one visit.
Is this eligible for HSA/FSA?
Yes. This test is HSA/FSA eligible, and you can pay with your HSA/FSA card at checkout.
When will I get my results?
Your results post to your dashboard once your lab completes them, then a clinician reviews them and your full analysis and personalized action plan (with clear next steps) follow. Turnaround varies by test: specialty assays and at-home kits take longer, and each test shows its expected turnaround before you buy.
Do I need a doctor’s order?
No. Mito provides the lab order for you, so you can book and get tested without a separate doctor visit.
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