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Last Updated
Jun 4, 2026
Table of contents
A full vitamin panel blood test gives you something most checkups skip: a complete view of your micronutrient status. Instead of guessing which vitamins might be low from symptoms, it measures what is actually circulating in your blood, and what might be quietly draining your energy, immunity, and long-term health.
At OneTwenty, full vitamin panels are a cornerstone of our quarterly, longevity-focused lab work. This guide covers what these panels measure, why they matter if you are serious about optimization, and how to turn results into a concrete plan. The difference between a full panel and a standalone vitamin D or B12 test is that a panel reveals interconnected patterns. Low B12 paired with elevated homocysteine, for example, signals a methylation issue that a single B12 test would miss entirely.
Why it matters
The deficiencies hiding in plain sight.
The contents
What a full panel measures.
A longevity-focused panel covers fat-soluble vitamins, water-soluble vitamins, and the functional markers that show how well your body is actually using them.
Fat-soluble (A, D, E, K)
Stored in fat and the liver. Vision, immunity, calcium regulation, clotting, antioxidant defense.
Vitamin AVitamin DVitamin EVitamin KWater-soluble B-complex and C
Energy production, nervous system, red blood cells, DNA synthesis, collagen, and immune support.
B1B2B3B5B6B9 FolateB12Vitamin CFunctional markers
The context that raw vitamin numbers lack. They confirm true deficiency and flag methylation or cardiovascular risk.
HomocysteineMMA25-OH vitamin DAt OneTwenty we often pair the vitamin panel with mineral testing (iron, ferritin, magnesium, zinc), because vitamins and minerals work together. This guide focuses on the vitamin side.
Normal is not optimal
Standard range vs optimal range.
Lab reference ranges show what is common in the general population. They are not the same as optimal. Longevity targets are usually narrower and more demanding than the standard cutoffs, which is where most people quietly fall short.
Read the signal
Symptoms and their likely culprits.
Many symptoms people write off as aging or stress are correctable vitamin issues. They are nonspecific, which is exactly why testing beats guessing.
The process
How it works at OneTwenty.
Five steps, from your first questionnaire to a plan you can actually act on.
You tell us your goals, whether that is afternoon energy, better sleep, performance, or healthy aging into your 60s and 70s. This tailors both your panel and the interpretation.
Your package pairs a full vitamin panel with core longevity tests like CMP, CBC, and thyroid markers. Add specialized tests as needed, such as a mineral panel for magnesium or a celiac screen.
Over 2,000 locations nationwide. Fast 8 to 12 hours if instructed, and pause high-dose vitamins 24 to 48 hours before so results reflect your true baseline, not a recent megadose. The draw takes about 10 to 15 minutes.
Results arrive in about 2 to 5 business days. A clinician or coach walks you through them and writes a plan: specific supplement forms and doses, food strategies, and re-test intervals.
When you retest in 90 days, you see trend graphs, not a single snapshot. You watch your vitamin levels, inflammation, and energy move together, with the data to prove the protocol is working.
What that looks like
One member, one marker, six months.
A 52-year-old member started with vitamin D at 24 ng/mL. After a protocol of 4000 IU of D3 daily plus deliberate outdoor time, their six-month retest read 47 ng/mL, right in the optimal band. Winter fatigue dropped and their parathyroid hormone normalized.
A second member, 45, came in with afternoon fatigue and brain fog. The panel showed B12 at 180 pg/mL and vitamin D at 22 ng/mL. Three months of targeted supplementation moved both into optimal range, and the fatigue lifted. The point is not the supplement. It is the testing that told them exactly what to fix and the retest that confirmed it worked.
Full panel vs single test
When to order which.
| Your situation | Better choice |
|---|---|
| Establishing a baseline you have never measured | Full panel |
| Quarterly or annual longevity check-in | Full panel |
| Evaluating status after a major diet change (vegan, keto) | Full panel |
| Catching co-existing issues a single test would miss | Full panel |
| Rechecking one known deficiency after treatment | Individual test |
| Investigating one specific symptom that points to one nutrient | Individual test |
Cadence
How often to test.
| Who you are | Frequency | Why |
|---|---|---|
| Healthy adults | Once per year | Catches emerging issues before they become problems |
| Correcting a deficiency | Every 3 to 6 months | Recheck B12 at 4 weeks for absorption, then at 3 months for stability |
| Longevity members | Quarterly | Track trends and adjust in real time, before changes become symptoms |
| After major changes | Shorter, temporarily | Vegan B12 can drop 50% in 6 months; metformin depletes B12 in 30% of diabetics over 4 years; PPIs cut absorption up to 30% |
The one rule that matters: always retest after changing a supplement or diet. Too many people start vitamin D, never check whether it is working, and hold the same dose for years. Your body is not static, so your dosing should not be either.
The bigger picture
One pillar of a broader lab strategy.
Vitamins in isolation miss patterns that only show up across the whole panel. At OneTwenty we read vitamins alongside the markers that interact with them.
The connections are the point. Low vitamin D plus elevated CRP suggests inflammation is driving the deficiency, or the reverse. Low B12 plus elevated MCV on a CBC points toward megaloblastic anemia that needs attention. Chasing single numbers without context leads to supplement stacking without strategy.
Stop guessing your health
Know where you stand. Then watch it improve.
OneTwenty pairs full vitamin panels with quarterly longevity labs, wearable data, and clinician-built protocols, all tracked in one dashboard so you can see your numbers move over time. OneTwenty launches in June 2026. Join the waitlist to claim your spot.
Join the OneTwenty waitlistFull vitamin panels · quarterly testing · clinician-reviewed · $499/yr
This article is educational and is not medical advice. Vitamin testing and supplementation should be guided by a licensed clinician, since both deficiency and excess carry real risks. Reference ranges and optimal targets vary by lab, individual, and source.
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