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It is a water-soluble vitamin, meaning excess will be flushed out in the urine

B12 increases metabolism which burns fat and results in weight loss

B12 injections deliver the vitamin directly into the bloodstream, ensuring maximum absorption and immediate effects, whereas oral supplements must pass through the digestive system, which can result in lower absorption rates and slower onset of action

Vitamin B12 is involved in the production of neurotransmitters that regulate mood and emotional well-being

This contributes to the absorption mechanism of oral vitamin B12, which does not depend only on intrinsic factors, but the absorption can be done through passive diffusion