2 to 3 days
Graber MD Updated: October 22nd 2022 Main Source of Information: Empower Overview of Cyanocobalamin (B12) Injection General Information Cyanocobalamin is a vitamin of the B-complex family, commonly known as cobalamins (corrinoids)
Irritating a nerve Injected in the wrong spot, a needle can come close to a nerve and cause sharp pain, tingling, numbness or weakness
Though deficiency for those starting out with adequate stores may take years to develop, the results of B12 deficiency can be devastating, with cases reported of paralysis, psychosis, blindness, and even death
Administration and Dosage For subcutaneous or intramuscular administration: Cattle, horses : 10 15 ml
This doesnt mean you cant touch the area, but you wouldnt want to lay on your face to have a massage, for instance, or wear a tightly-fitting motorcycle helmet - for those 36 hours directly after injection