can b12 injections make you tired Feeling All the Time? It Might Be a Vitamin Deficiency Vitamin B12 Shot - Delaware:

People with kidney disease should avoid high doses of B vitamins.

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Andersson, Emmanuel Shapira, Biochemical and clinical response to hydroxocobalamin versus cyanocobalamin treatment in patients with methylmalonic acidemia and homocystinuria (cblC), The Journal of Pediatrics, Volume 132, Issue 1, January 1998, Pages 121-124, ISSN 0022-3476, Okuda K, Yashima K, Kitazaki T, Takara I

Improved Mood- B12 is involved in the production of neurotransmitters such as serotonin and dopamine, which play a key role in regulating mood

The rapid absorption and utilization of the vitamin can lead to noticeable improvements in energy and overall well-being