Taking B12 for energy? The evidence says you're probably wasting your money. B12 is only powerful in one situation: when you're deficient. Not tired. Not run down. Not a bit low on Vitamin B12 Injections Energy Boost The Center Medical Red urinary discolouration following hydroxocobalamin treatment for vasoplegic syndrome Canadian Journal of Anesthesia Journal canadien d'anesthsie Springer Nature Link B12 Injections for Energy: Benefits and How It Works AZ IV Medics Vitamin B12 deficiency is more common than you think Frequent urination, tingling or burning in feet, numbness in hands & feet, cracked lips or tongue sores these are NOT normal