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What happens if you inject B12 wrong? CoLaz Lets do my first B12 injection together This is something Ive been nervous about for a long time, but today I finally did itand it honestly wasnt bad at all. I used the Union Medico needle guide Headache After B12 Shot: Why It Happens & What to Do Has anyone started taking vitamin B12 supplements and it's made them itch? I started on Sunday and by Tuesday evening I'd become quite itchy. Wondered if it had happened to anyone else?

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