syringe needle for vitamin b12 injections Red Liquid in a Disposable with a and in a Glass Ampoule on a White Background. Stock Image B12 Injections: Increase Your Energy,

However, there have been cases of people breaking out into acne and rosacea and having heart palpitations after taking very high doses of vitamin B12, usually by injection

Face: The most responsive area, with the strongest clinical evidence

Because levels are often quite low before a deficiency is recognized, it can take some time for serum concentrations to even out and symptoms to subside

PMC 11050313

Injectable: tenderness , swelling , bruising at the site, occasional mild flushing or transient fatigue

It took a while to figure out what was going on, but when they reduced her B12 dose to 250mcg three times a week and had her take it in the late morning (when kidneys work best), her symptoms improved and her kidney function stabilized