can t sleep after b12 injection What are the side effects of vitamin B12? Why Your B12 Shots Are

doi: 10.3390/nu11092232

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They could not determine whether obesity lowers B12 levels or if low B12 levels predispose someone to obesity

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B12 also plays a vital role in producing healthy red blood cells that carry oxygen, preventing conditions like megaloblastic anaemia, and is involved in DNA synthesis