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Vitamin B12 is essential for energy, focus, mood regulation, and healthy red blood cell production. But here's the problem: many people don't absorb enough B12 from food or supplements—especially if they're dealing Type:Vial gluten-free https://images.ctfassets.net/4f3rgqwzdznj/58wp9POKVTl1rq7jy2qNyL/df3643ab3e0569d8a22d1b3aa6aab86a/closeup_b12_injection_in_leg_1334792646.jpg [DOI] [PMC free article] [PubMed] [Google Scholar] Liu F
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