Low levels of 25-hydroxyvitamin D have been associated with higher risk for depression later in life, but there have been few long-term, high-dose large-scale trials.. Randomized assignment in a 2 × 2 factorial design to vitamin D3 (2000 IU/d of cholecalciferol) and fish oil or placebo; 9181 were randomized to vitamin D3 and 9172 were randomized to matching placebo.. Among the 18 353 randomized participants (mean age, 67.5 … Continue reading Effect of Long-term Vitamin #D3 Supplementation vs Placebo on Risk of Depression or Clinically Relevant #Depressive Symptoms and on Change in Mood Scores A Randomized Clinical Trial