Hydroxocobalamin acetate ampoules, vitamin B12a. Red coloured solution for injection in the treatment for vitamin B12 deficiency. Accord Healthcare Stock Photo Alamy 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 Vitamin B12 Injection: Uses, Side Effects, Price, Dosage & More Info PharmEasy Vitamin B12 Injection Benefits Pure Bliss Aesthetics Common Mistakes in B12 Injections to Avoid