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doi: 10.1016/j.soard.2013.04.017

This claim conflates several different mechanisms and ingredients

2013 Jun;106(6):505-15

5-Amino 1MQ 50mg ships from our US-based facility with standard or expedited options
The disease is called pernicious ( deadly ), because before scientists first isolated B12 (after which, shots became available), it was lethal

Taking the B vitamin folic acid (folate) or eating a lot of folate-containing foods without adding B12 can actually mask the symptoms of a developing B12 deficiency
