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Standard 1,000-5,000 mcg IV B12 Dosing Guidelines The amount of IV vitamin B12 can vary a lot

The anti-itch combination protocol: Layer 1: Oral antihistamine (cetirizine 10mg in the morning) Layer 2: Topical hydrocortisone 1% applied to affected area twice daily Layer 3: Cold compress for breakthrough itch (10 minutes as needed) Layer 4: Diphenhydramine 25mg at bedtime if itch disrupts sleep Avoid scratching at all costs

Have certain medical conditions: Problems that can restrict vitamin B12 absorption include pernicious anemia (a rare autoimmune disease that keeps the body from making a protein necessary to absorb B12), digestive illnesses, such as celiac and Crohns diseases, and immune disorders such as lupus, among others

AUA Update Series , Volume 40