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Vitamin C test for immune support and detecting nutritional deficiencies

Vitamin C Blood Test for Immune Health and Energy

Vitamin C

Google
3,138 reviews
  • Reveal your immune system's strength
  • Detect vitamin deficiencies early
  • Enhance your wellness with precise insights
First results as soon as overnight*

90 day happiness guarantee

We stand behind our service

Prescription & fees included

Go directly to the lab, no extra fees

Easy to understand results

With friendly doctor's notes & guidance

Fast & convenient

Lab visit as quick as 10 mins in & out

90 day happiness guarantee

We stand behind our service

Prescription & fees included

Go directly to the lab, no extra fees

Easy to understand results

With friendly doctor's notes & guidance

Fast & convenient

Lab visit as quick as 10 mins in & out

What's this test for?

This test is ideal if you're experiencing unexplained fatigue, weakness, frequent infections, slow wound healing, or bruising easily. It helps identify vitamin C deficiency (scurvy) which can affect your immune system, energy levels, skin health, and overall vitality. Many people use this test when they suspect their diet may be lacking in fresh fruits and vegetables or when they want to optimize their immune function and wellness.

How should I prepare for this test?

Overnight fasting is preferred for this test. You should avoid eating fruits and refrain from taking any vitamin C supplements for 24 hours before your blood draw. This ensures accurate measurement of your baseline vitamin C levels without interference from recent dietary intake or supplementation.

What's included in this test?

Vitamin C

This test measures your Vitamin C (ascorbic acid) levels to evaluate your antioxidant status and nutritional health. Vitamin C is essential for immune function, collagen production for healthy skin and connective tissue, wound healing, and protecting cells from oxidative stress. Low levels can lead to fatigue, weakened immunity, poor wound healing, and in severe cases, scurvy with symptoms like bleeding gums and skin problems.

What happens after I get my results?
You'll receive detailed doctor notes in simple language explaining what your vitamin C levels mean for your immune health, energy, and tissue repair. These notes include personalized recommendations like dietary changes to increase vitamin C intake, supplement suggestions if needed, and lifestyle tips for better absorption. You'll also get the standard lab report and can track your vitamin C levels over time using our trends feature to see how dietary changes are working.
When will I get my results?
You can expect to receive your vitamin C test results within approximately 5 business days after your blood sample is collected at the lab. You'll be notified as soon as your results are ready to view in your secure online account.
Who should consider getting this test?
This test is valuable for people who don't eat enough fresh fruits and vegetables, those with digestive issues that may affect nutrient absorption, smokers (who have higher vitamin C needs), and anyone experiencing frequent infections or slow healing. It's also useful for athletes wanting to optimize recovery, individuals with chronic inflammation, and those on restrictive diets who want to ensure adequate vitamin C intake.
What symptoms indicate I may need this test?
Common signs of low vitamin C include persistent fatigue, frequent colds or infections, easy bruising, slow wound healing, dry or rough skin, and bleeding or swollen gums. You might also notice joint pain, weakened hair, or feeling run down despite adequate rest. If you experience several of these symptoms, especially with a diet low in fresh produce, testing can help identify if vitamin C deficiency is contributing.
How can I naturally increase my vitamin C levels?
Boost your vitamin C by eating more citrus fruits (oranges, grapefruit, lemons), berries (strawberries, blueberries), kiwi, bell peppers, broccoli, Brussels sprouts, and tomatoes. Try to eat some of these foods raw when possible, as cooking can reduce vitamin C content. Avoid smoking, which depletes vitamin C, and consider spacing out vitamin C-rich foods throughout the day since your body absorbs it better in smaller, frequent doses.
What is vitamin C and why does it matter?
Vitamin C, also called ascorbic acid, is a powerful antioxidant that your body can't produce or store, so you need it from food daily. It's essential for making collagen (which keeps your skin, bones, and blood vessels healthy), supporting your immune system to fight infections, helping wounds heal, and protecting your cells from damage. Without adequate vitamin C, you may experience weakened immunity, poor healing, and low energy.
What does low vitamin C mean?
Low vitamin C levels indicate your body isn't getting enough of this essential nutrient, which can weaken your immune system and make you more susceptible to infections. It can also slow wound healing, cause fatigue and weakness, lead to dry or damaged skin, and in severe cases cause scurvy with bleeding gums and bruising. Low levels are often due to poor diet, smoking, digestive problems, or increased needs during illness or stress.
How often should I retest my vitamin C levels?
If your initial results show low vitamin C, retest in 6-8 weeks after making dietary changes or starting supplementation to see if levels have improved. Once your levels are optimal, annual testing is sufficient for most people to ensure you're maintaining adequate intake. If you have conditions affecting absorption, are under significant stress, or make major dietary changes, consider retesting every 3-6 months.
How’s this work?
Getting your blood test with us is easy, private & backed by the power of science.

Long story short:
  1. In the test options, use the filters or search box to narrow your choices and find the test you want.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!
  8. If you have any questions, please text us at 754-799-7833 or email [email protected] 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 [email protected], and we'll gladly help you. We've got your back and reply quickly.
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 [email protected]. 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 [email protected].
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 [email protected].

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 [email protected] and we'll gladly help you.

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

You get clinical lab reports & simplified health insights.
Save time & gas, go straight to the lab. Our doctors cover the rest.
Results start landing the next day after your lab visit.*
We don’t sell or share your data. Your time & privacy matter.
US-licensed doctors have your back if things get unclear.
No hidden fees, nice discounts for regular checkups.
Save a trip to the doctor, go directly to the lab
Instant orders, results often overnight*
Results explained in simple language
Reviewed by US licensed doctors
Fast & confidential, we never sell or share your data
No insurance needed, transparent pricing
Demo results
Vitamin C 0.3 mg/dL
Demo results
Low Optimal 0.4 - 2.0 High
0.3 mg/dL

What this means

Your vitamin C levels are below the optimal range, which may be affecting your immune function and energy levels. Low vitamin C can contribute to frequent infections, slow healing, fatigue, and weakened collagen production for healthy skin and connective tissue.

* Regular blood test results (e.g., CBC) typically start arriving the next business day after sample collection. More complex tests, such as hormone panels, may take up to 10–15 business days due to their complexity.
Here’s how easy it is to get blood work done on your terms
Choose a checkup
Order your test Save a trip to the doctor. Your results will come with clear, friendly explanations. Takes 2 minutes
Book a lab
Book an appointment Visit any of our 4,000 nearby lab locations to have your samples collected. Book or walk-in
Choose a checkup
Get results Receive a clear, easy-to-digest health report by email & SMS within a few business days. Get answers, fast

Vitamin C Blood Test for Immune Health and Energy

Google
3,138 reviews
  • Reveal your immune system's strength
  • Detect vitamin deficiencies early
  • Enhance your wellness with precise insights

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

Google reviews 3138 reviews Next
Still got questions? Text our super-cool support team at 754-799-7833 to get help finding your ideal checkup.