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How to Test for Nutrient Deficiencies Blood Tests for Common Deficiencies The following tests are recommended to diagnose deficiencies: General blood count Vitamin B12 level Vitamin D level Magnesium level Zinc level Iron and ferritin levels Folic Acid Levels Recognizing Symptoms as Warning Signs Pay attention to early warning signs of nutrient deficiencies such as vitamin D , B, and other nutrients, and see a specialist for treating anxiety

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