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Access this chapter Subscribe and save Buy Now Tax calculation will be finalised at checkout Purchases are for personal use only Similar content being viewed by others References Locatelli F, Nissenson AR, Barrett BJ, Walker RG, Wheeler DC, Eckardt KU, et al

Oocytes in the human ovary originate from embryonic primordial germ cells, which undergo limited mitosis

Montero-Montero, L

doi: 10.7150/thno.37717 48 DengYWangLZhangYSunDMinHZhouHet al

Severe kidney impairment Limited data

In fact, one study found that peoples bodies absorbed about 49% of a 1-mcg dose of cyanocobalamin, compared to 44% of the same dose of methylcobalamin ( Conversely, another study comparing the two forms reported that about three times as much cyanocobalamin was excreted through urine, indicating that methylcobalamin may be retained better within your body ( However, some research suggests that differences in bioavailability between the two forms may be insignificant and that absorption could be influenced by factors such as age and genetics ( Unfortunately, recent research directly comparing these two forms of vitamin B12 is limited