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GoodRx Guide

Vitamin B12 Deficiency

Comprehensive information for you or a loved one — including treatment options and discounts on popular medications.

Vitamin B12 deficiency occurs when there are low levels of B12. Symptoms include fatigueweight loss, and diarrhea.

Treatment for vitamin B12 deficiency includes increasing intake with supplements or food. Vitamin B12 analogues are commonly used.

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