lump on arm after b12 injection What causes a raised bump insulin injection? Best Vitamin B12 Injection Site:

Here is the short answer

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A clinical trial from the UK measured cognitive or other neurological functions in response to B12 supplements in 191 asymptomatic, non-anemic older people with low B12 levels and considered moderately deficient

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Store in the original, amber (brown) glass vial at room temperature, 68-77 F (20-25 C)