A patient seated in the chair before a blood draw
In person

Energy & Nutrients Panel

Six markers often checked for tiredness, from one blood draw.

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  • 2,000+ lab locations. Find one near you
  • Nothing due at the lab. FSA / HSA accepted
  • Ordered by a licensed clinician

At a glance

Collection
Blood draw
A standard blood draw at the lab.
Preparation
None
No fasting. If you have had fluorescein angiography, wait 3 days.
Results
2 to 4 days
Typical turnaround after your visit.
Where
2,000+ lab locations
Nationwide, with nothing due at the lab.

About this test

Feeling tired all the time can have many causes. This panel checks six markers often looked at first: vitamin D, B12, folate, ferritin (your stored iron), magnesium, and TSH for thyroid function. Sleep, mood, and other conditions are not measured here. Fasting is preferred, not required.

For adults 18 and older. Test availability varies by lab location.

Who should take this test?

For adults who feel tired or run down and want common nutrient and thyroid factors checked together, including people on plant-based diets. Commonly related symptoms include:

Body

  • Tiredness
  • Weakness
  • Muscle cramps

Mood

  • Low mood
  • Trouble focusing

Hair

  • Hair shedding

Skin

  • Pale skin

Lifestyle

  • Plant-based diet
  • Little sun exposure

Ask about this test

Not sure this is the right test?

AI-generated. For information only, not medical advice. Call 911 for an emergency.

What does this test measure?

These results show common nutrient levels and your TSH, so you and a provider can decide whether they may relate to how you feel and what to look at next.

Vitamins & minerals

25-hydroxyvitamin D
25-hydroxyvitamin D is the main form of vitamin D circulating in your blood and the usual way vitamin D levels are measured. Your skin makes vitamin D in sunlight, and it also comes from some foods and supplements. It helps your body absorb calcium and keep bones healthy.
Why it’s measured: A common way to check your vitamin D level, which supports calcium and bone health.
Vitamin B12
Vitamin B12 helps your body make red blood cells and keeps nerves working well. It comes from animal foods and fortified foods, and it needs a healthy stomach and gut to be absorbed. Levels can be lower with plant-based diets, some medicines, and conditions that affect absorption.
Why it’s measured: A vitamin your body needs to make red blood cells and keep nerves healthy.
Folate
Folate is a B vitamin your body needs to make red blood cells and new cells throughout the body. It comes from leafy greens, beans, and fortified grains. A low level can relate to diet, absorption, alcohol, or some medicines, and it is often read together with B12.
Why it’s measured: A B vitamin needed to make red blood cells, usually read together with B12.

Iron

Ferritin
Ferritin is the protein that stores iron in your body, so the level in your blood reflects your iron reserves. A low level points to depleted stores. Ferritin also rises with inflammation, infection, and liver stress, so a higher level is read in context with iron and TIBC.
Why it’s measured: Reflects your stored iron, often checked with a blood count.

Metabolic

Magnesium
Magnesium is a mineral involved in muscle and nerve function, heart rhythm, and many of your body’s chemical reactions. Most of it is stored in bone and cells, so the blood level is only a small part of your total. It can be affected by diet, absorption, kidney function, and some medicines.
Why it’s measured: To check a mineral involved in muscle, nerve, and heart function.

Thyroid

Thyroid-stimulating hormone (TSH)
TSH is made by the pituitary gland at the base of your brain and tells your thyroid how much hormone to make. It usually moves in the opposite direction from thyroid hormone: TSH tends to rise when the thyroid is underactive and fall when it is overactive. It is the usual first thyroid check.
Why it’s measured: Shows how strongly your pituitary gland is signaling your thyroid to work.

How it works

  1. Step 1

    Order online

    Check out here. A licensed clinician in your state reviews your order and sends it to the lab.

  2. Step 2

    Visit a lab

    Bring a photo ID to any of 2,000+ lab locations. No fasting. If you have had fluorescein angiography, wait 3 days. Nothing is due at the lab.

  3. Step 3

    Get your results

    Results post to your account, usually in 2 to 4 days, each number next to the lab’s reference range.

Find a lab near you

Choose from 2,000+ lab locations nationwide. Your order works at any of them.

What your results tell you

Each marker is reported as a value with its unit, such as ng/mL for vitamin D, and compared with the lab’s reference range.

  • Each marker next to the lab’s reference range
  • Explained in plain language
  • A licensed clinician reviews your order and, if appropriate, orders the test.
  • A lab report you can download and share

A result outside the range is a starting point, not a diagnosis. A healthcare provider can explain what it means and what to do next.

Clinical-grade testing, from the comfort of home.

From the lab to your report, every step of our process meets the gold standard in medical testing.

  • CLIA-certified labs

    Every lab we partner with is certified under the Clinical Laboratory Improvement Amendments, meeting both state and federal standards with regular independent inspections.

  • We protect your health data

    We protect your health data with encryption and do not sell it. Some results must be reported to public health authorities by law. See our Privacy Notice.

  • Rigorous quality assurance

    All partner labs run regular internal quality checks, participate in proficiency testing, and comply with federal and state lab regulations.

  • Clinician-reviewed reports

    Results are reviewed by an independent, licensed clinician.

Questions

Common questions.

Anything else, our care team answers by phone, text, or email.

Each looks at a different possible contributor to tiredness. B12 and folate are needed to make healthy red blood cells, ferritin reflects your iron stores, and TSH shows how your thyroid is being signaled. Vitamin D and magnesium are nutrients people often check when they feel run down. One draw covers all six.

That is useful to know, but it does not explain why you feel tired. Tiredness has many causes these markers do not measure, including sleep, stress, mood, medicines, and other medical conditions. If tiredness lasts or gets worse, talk with a healthcare provider.

Fasting is preferred but not required. The lab prefers a fasting sample for vitamin D, so if you can, come in before eating. Water is fine. If you have had fluorescein angiography, an eye exam that uses dye, wait 3 days before your draw, because the dye can affect some results.

Yes. Biotin supplements can affect some lab results, including the folate test in this panel, so tell your healthcare provider if you take biotin. Vitamin D, B12, folic acid, iron, or magnesium supplements can also change these results.

Don’t stop or change any medicine or supplement without talking with your healthcare provider.

Lab tests are informational and don’t diagnose conditions on their own. Available to adults 18 and older; test availability varies by lab location. A licensed clinician reviews your order and, if appropriate, orders the test. All testing is performed at CLIA-certified laboratories. Not for emergencies: if you think you may be having a medical emergency, call 911.