Testing / Core Metabolic Panel

Vitamin D · B12 · Magnesium · Omega-3

The deficiencies that make everything else not work.

Vitamin D deficiency impairs testosterone. Low magnesium blocks sleep and insulin sensitivity. B12 deficiency produces fatigue, cognitive impairment, and cardiovascular risk. Ferritin deficiency causes the same symptoms as thyroid disease. These are the foundations — and they're almost never tested.

Panel

Core Metabolic Panel

Price

$169

Shipping

Next Day

Take the Panel Quiz →

>40%

of adults are vitamin D deficient

Ferritin <50

ng/mL causes fatigue — haemoglobin stays normal

$169

panel — results in 3–5 business days

Why it matters

Three reasons this panel changes the conversation.

01

Ferritin below 50 ng/mL causes fatigue — haemoglobin stays normal

Iron deficiency anaemia is diagnosed when haemoglobin falls below range. But fatigue, brain fog, cold intolerance, and hair loss appear when ferritin falls below 50 ng/mL — well before haemoglobin is affected. Standard bloodwork only measures haemoglobin; this panel measures ferritin.

02

Serum magnesium is useless — RBC magnesium is what matters

The body maintains serum magnesium within a tight range by pulling from bones and tissues. Serum magnesium is normal until severe deficiency. RBC magnesium measures intracellular stores — the fraction that actually powers ATP production, insulin signalling, and sleep regulation.

03

Vitamin D below 40 ng/mL suppresses testosterone by up to 20%

Vitamin D receptors are present on Leydig cells — the cells that produce testosterone. Multiple studies show a direct relationship between vitamin D status and testosterone levels. Correcting vitamin D deficiency before prescribing testosterone optimization frequently resolves the hormonal complaint without intervention.

What's Included

Core Metabolic Panel — $169

Vitamin D (25-OH)Deficiency in >40% of adults — impairs testosterone, immune function, mood, and bone density
Vitamin B12Deficiency causes fatigue, cognitive decline, peripheral neuropathy, and elevated homocysteine
FerritinIron storage marker — low ferritin produces fatigue and brain fog identical to thyroid disease, often at 'normal' haemoglobin
RBC MagnesiumMagnesium is intracellular — serum magnesium is meaningless. RBC magnesium measures what's actually available for insulin signalling, sleep, and ATP production
ZincZinc deficiency impairs testosterone production, immune function, and wound healing
Omega-3 IndexEPA+DHA as a percentage of red blood cell fatty acids — low omega-3 index is an independent cardiovascular risk factor and inflammation driver
TSHThyroid — symptoms of hypothyroidism and micronutrient deficiency are clinically indistinguishable
BUN / CreatinineKidney safety — kidney function affects B12 and magnesium clearance
ALT / ASTLiver function — nutrient absorption and conversion occur in the liver

Order Today

Core Metabolic Panel

$169

✓At-home kit — no lab visit
✓Ships next day
✓Physician-reviewed results
✓HSA / FSA eligible

How it works

From order to results in 3 steps.

01

Order online

Choose your panel. Enter your details and check out in under 2 minutes.

02

Test at home

Your your at-home testing kit arrives next day. Painless upper-arm collection — no lab, no venipuncture.

03

Get results + protocol

Results in 3–5 business days. Your physician reviews and schedules your interpretation call within 48 hours.

HSA / FSA Eligible·
At-Home — No Lab Visit·
Physician-Reviewed·
Ships Next Day·
Board-Certified MDs

Also consider

Cardiovascular Deep Panel — $249

Homocysteine (B vitamin deficiency marker) and omega-3 index are both cardiovascular risk markers — the cardiovascular panel adds ApoB and Lp(a) for the complete picture.

Learn More →

Common questions

Everything you should know before ordering.

What are the optimal (not just 'normal') ranges for these markers?

Vitamin D: 60–80 ng/mL optimal (lab 'normal' starts at 30); B12: above 600 pg/mL optimal (lab normal starts at 200); Ferritin: above 50 ng/mL optimal for symptoms (lab normal starts at 12); RBC magnesium: above 5.6 mg/dL optimal; Omega-3 index: above 8% optimal for cardiovascular protection.

Can't I just supplement and see if I feel better?

You can — but without the baseline, you don't know which deficiency you're correcting, whether you've corrected it, or whether a supplement is pushing you into excess (excess B12 and excess iron have their own pathology). The panel tells you where to focus and when you've arrived.

Is this panel HSA/FSA eligible?

Yes. Physician-ordered diagnostic testing is HSA and FSA eligible. At a 32% bracket, effective cost is approximately $115.

Vitamin D · B12 · Magnesium · Omega-3

Core Metabolic Panel

At-home · Physician-reviewed · Ships next day · HSA/FSA eligible

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