Vitamin D and Vascular Disease.

Area of Science:

• Cardiovascular Medicine
• Endocrinology
• Nutritional Science

Background:

• Cardiovascular disease (CVD) is a leading global cause of death.
• Vitamin D deficiency is implicated in various non-skeletal diseases, including CVD.
• The role of vitamin D supplementation in cardiovascular health remains unclear.

Purpose of the Study:

• To review evidence linking vitamin D status to CVD.
• To discuss findings from vitamin D supplementation studies concerning CVD.

Main Methods:

• Narrative review of observational studies and randomized controlled trials.
• Analysis of associations between vitamin D levels and CVD risk factors (hypertension, dyslipidemia, diabetes).
• Evaluation of vitamin D's direct effects on cardiovascular tissues and processes (inflammation, cell growth).

Main Results:

• Observational studies suggest a link between low vitamin D and increased CVD risk.
• Mendelian randomization studies do not confirm a causal relationship.
• High-quality randomized trials show no significant reduction in CVD endpoints with vitamin D supplementation.

Conclusions:

• While vitamin D deficiency is associated with CVD risk factors, evidence does not support a causal link.
• Current evidence does not support vitamin D supplementation for preventing cardiovascular events.