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1000mcg of vitamin B12 methylcobalamin

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Those under consideration include peptides that the FDA, under the Biden administration, directed compounding pharmacies to stop making due to safety concerns, including the possibility of immune reactions

I did not leave as I was too fatigued to function

Certain populations face higher deficiency risk: vegetarians and vegans (B12 is primarily found in animal products), adults over 50 (decreased stomach acid reduces B12 absorption), individuals with digestive disorders like Crohn's disease or celiac disease, and those taking medications like metformin or proton pump inhibitors