While considering our preferable form of taking medications we also take to consideration the inability of some drugs exit in this forms and as such no matter how much you love intravenous or intramuscular injection, some pills will still be administered by a doctor to enhance your well being. To clarify this food is good for the body but not all foods are given to babies at tender age so is the case in drugs. You have explained the statement above by the pattern of medication concerning vitamin B12. Goodluck friend, I wish you the best🎉☘️