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For infants up to 12 months, the adequate intake (AI) is 0.40.5 g/day
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The specific concentration, exposure time, and experimental protocols are determined by the researcher based on the study design, existing literature, and institutional guidelines
UK guidelines recommend monitoring clinical response and full blood count (typically at around 2 months) to ensure treatment adequacy, rather than routinely rechecking B12 levels after replacement has started
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