5 Common Signs You Are Vitamin D Deficient 1. Feeling Depressed Researchers have found that individuals with low Vitamin D levels are as much as ten times more prone to falling into depression. 2. Feeling Moody Serotonin is affected by Vitamin D levels. This imbalance can leave you feeling moody and depressed. 3. Achy Bones … Continue reading 5 Common Signs of Vitamin D Deficiency