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Description
Vitamin B12, commonly referred to as the energy vitamin, is crucial for supporting healthy nerves and red blood cells

Localization of cells producing erythropoietin in murine liver by in situ hybridization

To avoid getting vitamin B12 deficiency, you should take a daily vitamin B12 supplement

absorption is reliable, and pain is typically minimal if proper technique is used (pinch the skin, insert at ~4590 depending on needle length)
