☀️ Vitamin D, Cortisol & Stress — What the Science Suggests
Vitamin D plays a supportive role in cortisol synthesis and regulation of the HPA axis, the system that governs how your body responds to stress. When vitamin D levels are low, cortisol signaling may become less efficient, reducing stress tolerance. Chronic stress, in turn, has been shown to lower circulating vitamin D—forming a biological feedback loop that may contribute to fatigue, mood disorders, and metabolic dysfunction.
Recent meta-analyses and narrative reviews report associations between vitamin D deficiency and altered cortisol rhythms, higher perceived stress, and poorer mental health outcomes. Several reviews also suggest that restoring adequate vitamin D status may help normalize stress responses, particularly in deficient populations.
Evidence-based ways to improve vitamin D status include:
Sunlight exposure: ~10–30 minutes of midday sun, several times per week, depending on skin tone and latitude
Supplementation: Vitamin D3 is commonly used when sun exposure is limited or deficiency is present, with doses guided by blood levels
Dietary support: Fatty fish, egg yolks, and fortified foods can contribute modestly
⚠️ Always consult your doctor or healthcare professional before starting any vitamin D supplement, especially if you have medical conditions or take medications. Blood testing is the gold standard for personalized guidance.
