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Palmer CD, Scallan CD, Kraemer Tardif LD, Kachura MA, Rappaport AR, Koralek DO, et al

Mahadevan D, Venkatesan M, Bhatt R, Bhatia M

Oral Supplements: A Quick Comparison For people with a confirmed deficiency, especially those with absorption problems, injections generally act faster than oral supplements: Injections: bypass the gut, reliably reach the bloodstream, and often produce noticeable changes in energy and mental clarity within days for those who are deficient

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This specific code applies when a patients body cannot produce sufficient intrinsic factor-a protein secreted by gastric parietal cells-leading to impaired vitamin B12 absorption in the small intestine