Vitamin D Supplementation
for Seasonal Affective Disorder
Vitamin D deficiency is common in winter and has been associated with depression and mood disorders. Supplementation is widely recommended in low-sunlight months.
How it works
Vitamin D receptors are expressed throughout the brain. Deficiency impairs serotonin synthesis and may contribute to winter mood changes through direct neurosteroid-like effects.
What to watch for
Evidence specifically for SAD is mixed — benefit most likely in those who are actually deficient. Routine winter supplementation (1000–2000 IU/day) is reasonable and low risk.
Community experience
Other remedies for Seasonal Affective Disorder
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