It also makes up a component of cell membranes, supporting the structural integrity and signaling of brain cells and functioning of the blood brain barrier
10.1155/2019/9084643 67 KraljT.KokotA.KasnikK.DrmicD.ZlatarM.SeiwerthS.et al (2017)
According to Harvard Medical School, people with cobalamin deficiency may experience subtle but unusual and progressive signs of illness, including strange tingling or numb sensations, difficulty walking, cognitive and memory issues, and weakness
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The abdomen (avoiding a 2-inch radius around the navel), outer thigh, and upper arm provide suitable injection locations with adequate subcutaneous tissue