What's this test for?

This test is ideal if you're experiencing persistent fatigue, low energy, or suspect you may have nutritional imbalances affecting your daily performance. It measures your Vitamin B3 levels to help identify deficiencies that could be contributing to tiredness, poor concentration, digestive issues, or skin problems. Many people use this test when they want to understand if their diet is providing adequate B vitamins or if supplementation might help improve their energy and overall vitality.

What happens after I get my results?

You'll receive detailed doctor notes in simple language explaining what your Vitamin B3 levels mean for your energy, metabolism, and overall health. These notes include personalized recommendations like dietary changes to increase B3-rich foods, supplement suggestions if needed, or lifestyle modifications to improve absorption. You'll also get the standard lab report and can track your vitamin levels over time using our trends feature to see how dietary changes or supplementation are working.

What's included in this test?

This panel measures Nicotinamide and Nicotinic Acid. These biomarkers help evaluate your body's B3 status and metabolism, which directly impacts your energy production, cellular function, and cardiovascular health. Together, these measurements provide insight into whether you're getting adequate Vitamin B3 from your diet or supplements, and can help explain symptoms like fatigue, skin issues, or digestive problems.

How should I prepare for this test?

This test is a fasting blood draw. Follow any specific timing instructions provided by the lab, as Vitamin B3 levels can vary based on when you take supplements or eat B3-rich foods. For the most accurate results, it's best to have the blood drawn in the morning. Your results will typically be available in about 7 business days.

When will I get my results?

You can expect to receive your Vitamin B3 test results within approximately 7 business days after your blood sample is collected. You'll be notified as soon as your results are ready, and you can access them online along with easy-to-understand doctor notes explaining what your levels mean and what steps you should take next.

Who should consider getting this test?

This test is valuable for people experiencing unexplained fatigue, those following restrictive diets that may lack B vitamins, or anyone taking high-dose B3 supplements who wants to monitor their levels. It's also helpful for individuals with digestive issues that may affect nutrient absorption, people with skin conditions like pellagra, or those seeking to optimize their nutrition and energy levels through data-driven dietary choices.

What symptoms indicate I may need this test?

Common symptoms of Vitamin B3 deficiency include persistent fatigue, weakness, poor concentration or brain fog, digestive problems like diarrhea or nausea, and skin issues such as rough or inflamed skin. Some people also experience headaches, memory problems, or mood changes. If you're dealing with these symptoms and suspect nutritional deficiencies might be the cause, this test can provide valuable answers.

How can I naturally support my Vitamin B3 levels?

You can boost your Vitamin B3 intake by eating foods rich in niacin, such as chicken, turkey, beef, fish (especially tuna and salmon), peanuts, and mushrooms. Whole grains, legumes, and fortified cereals are also good sources. Your body can also make some B3 from the amino acid tryptophan found in eggs, dairy, and turkey. Maintaining good gut health helps with absorption, and reducing alcohol consumption protects your B vitamin stores.

What is Vitamin B3 and why does it matter?

Vitamin B3, also called niacin, is an essential nutrient your body needs to convert food into energy, maintain healthy skin and nerves, and support proper digestion. It plays a crucial role in over 400 cellular reactions and helps produce important molecules that fuel your body and brain. Without adequate B3, you may experience fatigue, poor concentration, digestive issues, and other health problems that can significantly impact your quality of life.

What does high Vitamin B3 mean?

Elevated Vitamin B3 levels usually occur from taking high-dose niacin supplements, often used to improve cholesterol levels. While moderate supplementation is generally safe, very high levels can cause side effects like skin flushing, itching, nausea, or in rare cases, liver problems. If your levels are high, your doctor may recommend adjusting your supplement dosage or switching to a different form of B3.

Getting your blood test with us is easy, private & backed by the power of science.Long story short: In the test options, use the filters or search box to narrow your choices and find the test you want. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy! If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

How do I know which test to get?

In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option. Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.

When will my lab results be available?

Most test results will be available within 1–3 business days. Once they're ready, we'll send an email and text message to let you know. After your blood draw, just hang tight and don't worry – we'll keep you updated and in the loop! If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com, and we'll gladly help you.

Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?

Absolutely! We totally understand that errors can happen. No worries, we're here to help you. Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you. There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out. Our lab requires an address to be listed to generate an order.

Do you accept health insurance?

Only HSA & FSA is accepted. Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts. This policy applies to all insurance companies, including federal health insurance programs like Medicare. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

Can I cancel my order?

Yes. We get it – sometimes your needs change. As long as your samples haven’t been collected yet, we’re happy to help you cancel your order. If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com. You can read more about our cancellation policy here.

How can I find a lab location near me?

During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp). Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

Vitamin B3 Test - Fatigue & Energy Blood Work

Getting your blood test with us is easy, private & backed by the power of science.

Long story short:

In the test options, use the filters or search box to narrow your choices and find the test you want.
If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!

754-799-7833

[email protected]

Blood Test for Fatigue and Low Energy Levels

Vitamin B3

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

What's this test for?

How should I prepare for this test?

What's included in this test?

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

Blood Test for Fatigue and Low Energy Levels

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

1,000,000+ blood tests later, here's what our customers say