What Color is Vitamin B12 Injection? Dr. Scott Denny Vitamin B12 Injection Skin Spa New York Vitamin B12 Injection Ampoules Package Isolated Stock Vector (Royalty Free) 770959708 Shutterstock Do you know why vitamin B12 is red? Vitamin B12 (Methylcobalamin) is red in color because it contains cobalt (Co), a rare biochemical element, at the center of a porphyrin ring How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust