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When you suffer from a deficiency in b12 or low hemoglobin, you may experience megaloblastic or pernicious anemia, health conditions that can cause you to feel lethargic, weak and even pale in colour

Major medical sources state B12 shots do not boost energy or cause weight loss unless you are deficient

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Also, some medications can interfere with B12 absorption

It is converted to coenzyme B12 in the body and in this form facilitates the conversion of homocysteine to methionine (methylcobalamin) and plays an important role in converting methylmalonyl-coenzyme A to succinyl-Co-A (fatty acid and amino acid metabolism)