how long before b12 injection kicks in Do You Need a Prescription for Injections? How Long Does Vitamin B12

But many healthcare professionals follow a different dosing schedule for injectable cyanocobalamin

Nutrient deficiencies are more common than many people realize, especially for those with busy lifestyles or dietary restrictions

Clinical signs of B12 deficiency include nausea, vomiting, loss of appetite, poor absorption of food (malabsorption syndrome), constipation, gas, weight loss, fatigue, lethargy, abdominal pain, and diarrhea

(PubMed) Eskes TK

Frequency Due to the different ways in which the body absorbs B12, each form of supplement has a different frequency with which you need the treatments

References Andres E, Serraj K