how many mcg in a b12 injection Vitamin B-12 5000 mcgInjection Vitamin B12 (5000 mcg/ml) [100
Description
For more on vitamin B12 and mood disorders, check out this study

Benefits of adequate B12 include sustained energy throughout the day, deeper sleep, improved mental clarity, better exercise capacity, healthier hair and skin, and reduced nerve pain

Could it be that B12 was feeding budding tumors or something

Yes, older adults and those with other health problems might need different doses
