If you experience significant energy decreases that do not improve, consider whether other factors might be involved
However, if youre already getting enough of the vitamin from your diet, its unlikely that youll notice any changes to your energy levels by taking a vitamin B12 supplement
B12 injections: Fast, simple, and effective for those who need only B12
[1] [2] B12 injections are primarily prescribed for patients with pernicious anaemia , an autoimmune condition where the stomach cannot produce intrinsic factor, a protein essential for B12 absorption in the gut
It should be used with caution in patients with severe, pre-existing mitochondrial disease
Your Current Health Metabolism, energy levels, and liver health all play a role