Vitamin B3 (Niacin) Test
Order online, visit a nearby lab, and get private results online. No doctor's visit or insurance needed.
- 4,500+ CLIA-certified labsNo appointment needed for most tests
- Physician-orderedNo doctor’s visit or referral needed
- Secure and confidentialNot billed to insurance
- Most results in 1–3 daysIn your secure online account
- HSA/FSA cards acceptedItemized receipt available
Price $49 Compare at $98
You save $49 · 50% off
110% price guarantee · No hidden fees
How to prepare No fasting needed
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Get this test plus more in one lab visit.
- Comprehensive Vitamin PanelThis test plus 11 more tests$599View panel Comprehensive Vitamin Panel
About this test
This blood test is used to determine Vitamin B3 (Niacin) deficiencies.
Like all B vitamins, niacin (vitamin B3, also known as nicotinic acid) plays a role in converting carbohydrates into glucose, metabolizing fats and proteins, and keeping the nervous system working properly. Niacin also helps the body make sex-related and stress-related hormones and improves circulation and cholesterol levels.
Your liver can convert tryptophan, an amino acid from high-protein foods like meats and milk, into niacin.
Symptoms of mild niacin/vitamin B3 deficiency include:
- Indigestion
- Fatigue
- Canker sores
- Vomiting
- Depression
Serious deficiency of vitamin B3 is called pellegra and can result in death. Pellegra includes more serious symptoms like:
- Thick, scaly pigmented rash on skin exposed to sunlight
- Swollen mouth and bright red tongue
- Vomiting and diarrhea
- Headaches
- Apathy and/or depression
- Fatigue
- Disorientation
- Memory loss
Good sources of niacin include:
- Red meat
- Fish
- Poultry
- Fortified breads and cereals
- Enriched pasta
- Peanuts
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From order to results
No doctor's visit, no appointment and no insurance paperwork.
- TodayOrder online No doctor’s referral or insurance needed. Our physicians provide the lab order.
- Same dayWalk in to a nearby lab 4,500+ CLIA-certified U.S. labs. No appointment needed.
- 1–3 daysGet your results Most results post to your secure account within 1–3 business days.
- NextTake them further Download them to share with your doctor, or text Patient Services with questions.
HealthLabs.com vs. going through your doctor
| Feature | HealthLabs.com | Through your doctor |
|---|---|---|
| Referral needed | No, our physicians provide the order | Usually requires a visit first |
| Appointment | Walk in for most tests | Book, then wait for a visit |
| Insurance | Not needed | Co-pays and deductibles may apply |
| Price known upfront | Yes, listed next to every test | Often not until you're billed |
| Choose your own tests | Yes, from our full test menu | Your doctor decides |
| Getting results | Online, most in 1–3 business days | Often shared at a follow-up |
Vitamin B3 (Niacin) Test
No doctor's visit needed · HSA/FSA cards accepted · 110% price guarantee
Price $49 Compare at $98 You save $49 · 50% off