B12 injections have been reported to boost brain function, improve mood, reduce the risk of osteoporosis and macular degeneration, increase energy, and aid in weight loss
This can be particularly beneficial for those suffering from depression or mood swings
A deficiency in vitamin B-12 can be associated with weight loss, poor haircoat, vomiting and diarrhea in cats
[4] However, consistently taking large amounts of vitamins from multiple sources could potentially increase the risk of side effects (for example, very high vitamin B intake from multiple supplements over time can cause neuropathy, and high niacin from many sources could affect your liver)
This stresses the need to pick the right Vitamin B12 injection for each patient
No human study has tested these combinations