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Also, intrinsic factor (IF), another protein that is released by the parietal cells of gut, must bind with B12 or it will not be absorbed by the small intestine Size:10 ml Oral BPC 157 https://rpbmedical.com/wp-content/uploads/2025/10/vitamin-b12-injections-desktop.jpg B12 deficiency - self treatment plan : r/B12_Deficiency

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