inject b12 in stomach Shots at Home: How, Where & How Often to Yourself How to Self-Inject Vitamin B12
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doi:10.1016/j.cmet.2011.08.014 Goldberger J

If it passes, it might still have degraded invisibly

Troen, A

Elshorbagy, A

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However, evidence from research studies suggests that GLP-1 analogs may also reduce gastric acid secretion, which can impair the conversion of dietary B12 into its absorbable form and decrease binding to intrinsic factor, both of which are necessary for proper absorption
