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[6] [3] [10] A mild deficiency may not cause any discernible symptoms, but moderate deficiency can cause various symptoms, such as feeling tired, lightheadedness, headaches, cold intolerance, pale skin, sore tongue, upset stomach, loss of appetite, hair and skin color changes, numbness or tingling (pins and needles) of the fingers and toes, and tinnitus, and vision, cognitive or psychological problems

They measured both binding and cell proliferation

While you can most certainly give yourself a B12 shot at home, there are a few things you need to know to make sure you are doing it safely and effectively

Researchers should always confirm the lot number on their vial matches the COA on file before beginning any assay