This depends on multiple factors including your B12 blood levels
B12 injections are typically administered intramuscularlyusually in the upper arm or thigh
Nutrition counseling has been suggested as a first-line or adjunctive therapyfor individuals with mild to moderate acne. It looks like high glycemic foods and dairy products are exacerbating factors, so were talking about sugar, soda, refined junky carbohydrates, white flour, breakfast cereal, and dairy products, like milk, cheese, yogurt, and whey, as well as saturated and trans fats, which are concentrated in meat, dairy, junk, and fast food
Vegetarians and vegans Since Vitamin B-12 is obtained mostly from animal products, most vegetarians and vegans are deficient
To make sure this medicine is safe for you, tell your doctor if you have: eye problems or Leber's disease (in you or a family member)