does b12 injection cause constipation Comber Understanding the B12 Vitamin Shot:
Description
Available online at: (Accessed May 30, 2026)
This ensures maximum absorption and immediate availability, making it a highly effective method for addressing nutrient deficiencies
Cyanocobalamin is cleared from the body faster and is typically given once a month [6]
Hydroxocobalamin is the form the NHS uses because it lingers in the body longer than cyanocobalamin, and its pharmacology supports dosing intervals of up to three months once levels are stable
