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Mild symptoms can include: Pale skin Feeling irritable Loss of appetite Diarrhea or constipation Feeling short of breath when exercising Swollen and red tongue or bleeding gums Feeling tired or lightheaded with light exertion If your vitamin B12 stays low for a longer period of time, your nerves may experience some damage, which can cause other, more serious symptoms such as: Confusion Hallucinations Trouble concentration Having trouble balancing Numbness and tingling in your hands and feet Recommended Daily Intake of Vitamin B12 For most adults, health professionals recommend taking 2.4 mcg of B12 daily

[DOI] [PMC free article] [PubMed] [Google Scholar] 816.Luffarelli, R

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Meng S, Cason GW, Gannon AW, Racusen LC, Manning RD Jr

Downregulation of Keap1 contributes to poor prognosis and Axitinib resistance of renal cell carcinoma via upregulation of Nrf2 expression