can b12 injection make you feel sick Feeling worse after Injection: Answering concerns Vitamin B12 shots: Uses, benefits,

Research shows the compound can induce fat loss without affecting food intake, giving researchers a tool to study metabolic rate independent of appetite mechanisms

Observational data strongly supports this phenomenon

(2001) Inhibition of the rise in FFA by acipimox partially prevents GH-induced insulin resistance in GH-deficient adults

For example, how bad the deficiency is, or if the body cant absorb it well

Not sure whether this was due to improper storage - it needs to be kept cool and in the dark otherwise can degrade - or for some other reason

Metformin-Induced Vitamin B12 Deficiency Can Cause or Worsen Distal Symmetrical, Autonomic and Cardiac Neuropathy in the Patient With Diabetes