does b12 injections make you gain weight for Loss - it Even Work? The Truth About B12 Injections:

Those cats receiving adjuvanted vaccines had evidence of residual adjuvant material accumulated within macrophages even at 62 days post-vaccination (Day et al., 2007)

At Lone Star Center for Health and Wellness, B-12 injections are commonly used to treat vitamin B-12 deficiencies, which can lead to symptoms like fatigue, weakness, memory problems, and mood disturbances

Exp Biol Med (Maywood)

It also aids in producing neurotransmitters, which are chemicals that help communicate between neurons in the brain, improving brain function

When levels are low, it can lead to anemia, which may reduce how well oxygen is carried through the body