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Also reported in: nmol/L
A normal vitamin D within the reference range supports basic bone health and immune function. However, from a mental health optimization perspective, the conventional normal range (>20 ng/mL) may be insufficient for optimal brain function. The optimal range for mood and cognitive health is generally considered 40–60 ng/mL.
Very low vitamin D below 10 ng/mL represents noticeable deficiency affecting nearly every organ system. Vitamin D receptors are densely distributed throughout the brain, and very low levels are strongly associated with noticeable depression, anxiety disorders, cognitive decline, psychosis vulnerability, and multiple sclerosis. At this level, skeletal health, immune function, and cardiovascular risk are also very impacted.
Medical treatment with high-dose vitamin D under supervision is needed. Typical correction doses are 50,000 IU weekly for 8–12 weeks. Retest and is consistent with levels are rising appropriately.
Vitamin D: {{value}} {{unit}} — very deficient (ref: {{low}}–{{high}}; critical: <10)Vitamin D deficiency below 20 ng/mL is strongly associated with depression, seasonal affective disorder, anxiety, fatigue, brain fog, and poor sleep quality. Vitamin D receptors are found on neurons throughout the brain and are required for serotonin synthesis, dopamine regulation, and neuroplasticity. Deficiency impairs all of these systems. This is one of the most common and most reversible contributors to depression.
Start vitamin D supplementation — typically 2000–5000 IU daily — and retest in 2–3 months. Get safe sun exposure when possible. Discuss optimal dosing with your doctor.
Vitamin D: {{value}} {{unit}} — deficient (ref: {{low}}–{{high}}; deficient: <20)Vitamin D insufficiency between 20 and 30 ng/mL means levels are above clinical deficiency but below the level optimal for brain health and mood. Research consistently shows mood benefits from raising vitamin D above 40 ng/mL, with people in the 20–30 range experiencing more mood variability, lower energy, and slightly blunted cognitive performance than those at 40–60 ng/mL.
Increase vitamin D through supplementation (1000–3000 IU daily) and regular sun exposure. Aim to raise to the 40–60 ng/mL optimal range for mental health benefits.
Vitamin D: {{value}} {{unit}} — insufficient (ref: {{low}}–{{high}}; insufficient: 20–30)A normal vitamin D within the reference range supports basic bone health and immune function. However, from a mental health optimization perspective, the conventional normal range (>20 ng/mL) may be insufficient for optimal brain function. The optimal range for mood and cognitive health is generally considered 40–60 ng/mL.
Consider optimizing to the 40–60 ng/mL range for best mental health outcomes, especially if experiencing mood symptoms or brain fog.
Vitamin D: {{value}} {{unit}} — normal (ref: {{low}}–{{high}})An optimal vitamin D between 40 and 60 ng/mL supports the best brain function, mood regulation, and cognitive performance. At this level, vitamin D receptors throughout the brain — including areas involved in serotonin synthesis, dopamine regulation, and neuroprotection — are adequately supported. Research associates this range with the lowest rates of depression, best cognitive aging outcomes, and strongest immune defense.
Excellent result. Maintain with regular sun exposure and/or supplementation. Monitor annually to ensure levels stay in this optimal range.
Vitamin D: {{value}} {{unit}} — optimal (ref: 40–60)A vitamin D level between 60 and 80 ng/mL is still within the acceptable range for most people. Some researchers argue that levels up to 80 ng/mL provide additional immune and anti-inflammatory benefits. At this level, vitamin D toxicity is not a concern — toxicity only occurs at levels typically above 150 ng/mL from very large supplementation over prolonged periods.
This is generally not concerning. Adjust supplementation to maintain stable levels rather than continuing to increase.
Vitamin D: {{value}} {{unit}} — borderline high (ref: {{low}}–{{high}}; borderline: 60–80)Vitamin D above 80 ng/mL is above the conventional reference range and generally exceeds what is needed for health benefits. While acute toxicity does not occur at this level, persistently high levels above 100 ng/mL can lead to hypercalcemia (high blood calcium). At 80–100 ng/mL, reducing supplementation dose and monitoring is appropriate.
Reduce vitamin D supplementation dose. Retest in 2–3 months to confirm this levels are falling toward the 40–60 ng/mL optimal range.
Vitamin D: {{value}} {{unit}} — elevated (ref: {{low}}–{{high}}; elevated: 80–100)Vitamin D above 100 ng/mL represents vitamin D excess with risk of toxicity. At these levels, hypercalcemia (elevated blood calcium) can occur, causing nausea, vomiting, kidney stones, calcification of soft tissues, and cardiac arrhythmias. This level is almost exclusively caused by excessive supplementation — it cannot be reached through sun exposure alone.
Stop vitamin D supplementation immediately and seek medical evaluation. Check serum calcium and kidney function. Toxicity treatment may require hydration and possibly corticosteroids.
Vitamin D: {{value}} {{unit}} — potentially toxic level (ref: {{low}}–{{high}}; critical: >100)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.