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Symptoms of Combined Vitamin D and Vitamin B12 Deficiency Vitamin D and B12 deficiencies can happen independently, but they share some overlapping symptoms
When to Adjust Dosing Increase dose if: After 4-6 weeks at current dose, no measurable body composition changes occur, youre tolerating current dose without side effects, youre below the upper clinical range (1 mg daily), and your physician approves escalation based on comprehensive assessment
Absorption and Bioavailability Oral Vitamin B12 requires absorption in the small intestine via intrinsic factor, which some people lack due to genetics, age or digestive disorders
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