B12 shots may help restore healthy red blood cells, alleviate symptoms like fatigue and weakness, and offer faster benefits compared to oral vitamins
COAs are not published publicly to protect supply-chain privacy and prevent competitor scraping
In practice that means three things
Each has its own strengths and weaknesses
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In cases of documented vitamin deficiency, the regimen could be an initial intensive phase (like 2 mL IM three times a week for 2 weeks) followed by reevaluation