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Most people having B12 injections (intramuscular) will see an improvement in the first 24 hours, but the hematological response, including the quick production of new red blood cells, may take several days to months for a full response
However, this combination has not been formally studied
It usually resolves within 4 to 6 weeks if you ease back on frequency
Besides B12, these injections include methionine, an amino acid that helps the body process fat through the liver
More research is needed to determine whether vitamin B12 directly affects body weight or BMI
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