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Vitamin D

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substance Score Unrated 0 ratings— needs ≥ 3 ratings Also on Neurotransmission ↗
Anti-agingAnti-inflammatory

Vitamin D is essential for bone health and has receptors throughout the brain, and deficiency is associated with depression and other problems. However, large randomized trials (such as VITAL) have generally not found that supplementing vitamin D in non-deficient people prevents depression, cognitive decline, or major disease. The clearest benefit is correcting a genuine deficiency, which is common in low-sunlight settings.

Too little may be associated with

Deficiency: low mood, fatigue, bone and immune problems.

Too much may be associated with

Toxicity: high calcium, nausea, kidney strain.

Informational only — not medical advice.

Benefits

Supports calcium absorption, bone health, and immune function; supplementation corrects the widespread deficiency common in low-sun climates.

Risks

Fat-soluble, so excess causes toxic high calcium (nausea, kidney stones, heart-rhythm problems). Test levels rather than mega-dosing blindly.

Informational only — not medical advice.

Body systems

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Hormones

Neurotransmitters

Related

Where to buy

Popular Vitamin D products on Amazon. Not medical advice — talk to a clinician before starting a supplement.

As an Amazon Associate, Neurotransmission earns from qualifying purchases.

Research (22)

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