Vitamin D Deficiency Can Trigger Autoimmune Conditions. Here's Why. ScienceAlertAmerica’s Most Common Nutrient Deficiencies and How to Spot Them Visual CapitalistAlways Tired? You May Be Low on Micronutrients, According to Nutrition Experts Real SimpleAlmost All Americans Are Deficient In This One Vitamin DiggBuild up your nutrient defenses The American Legion