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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
For those who experience fatigue or lethargy due to B12 deficiency, injections can provide a rapid energy boost, helping you feel more alert and active throughout the day
Saline contains sodium chloride, whereas bacteriostatic water contains only sterile water and benzyl alcohol
Furthermore, a very low-calorie diet like this one can be dangerous if not done under medical supervision
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