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Doctors typically use B12 shots to treat vitamin B12 deficiency
B12 absorption is regulated through intrinsic factor, which is produced by gastric parietal cells in the stomach, with the B12-intrinsic factor complex being absorbed in the terminal ileum
The FDA has issued warning letters to suppliers marketing it for human use between 2017 and 2023
BMC Microbiol
It should be noted that the musculoskeletal evidence base remains preclinical, a 2025 scoping review by McGuire and colleagues in Current Reviews in Musculoskeletal Medicine found no adequately powered randomised controlled trials
There may be a "crash" period near the end of your week
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