I've been searching for this but couldn't find a definitive answer. Hope some of you want to share their opinion / expertise. Have there been any studies done on the bio-equivalance between the different application forms of methylcobalamin? By that i mean intramusculair vs. subcutaneous vs sublingual. I know that oral has bad bio-availability, especially in those with inflammation in the ileum. I've just received 10 X 1mg/ml vials methylcobalamin which i'd like to start with today but have to decide I.M. or S.C.