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32 Even oral intake of high doses of glutathione does not lead to high enough serum levels to be of therapeutic value

B12 deficiencies often lead to fatigue, weakness, and low stamina

Some of the roles that are attributed to vitamin B12 include: Forming red blood cells Playing a role in DNA/RNA synthesis Acting as a cofactor for methionine synthase (helping with methylation or the conversion of homocysteine to methionine, which protects cardiovascular health and more) Facilitating metabolic conversion of protein and fats Carrying out neurotransmitter functions and helping with production of hormones Helping convert amino acids and make creatine Producing myelin sheath (the coating of nerves) Helping with synthesis of hemoglobin Playing a role in fetal development during pregnancy Vitamin B12 levels are usually tested with a blood serum test, and values below approximately 170250 picogram per milliliter in adults are considered signs of deficiencies

HFF-1 cells maintained in a T-25 cell culture flask (Corning, United States) at 37C in a 5% (v/v) CO 2 atmosphere and harvested at 90% confluence using 0.12% trypsin-EDTA