can you get too much vitamin b12 injection Injections and Weight Loss: How Does it Work? Why Do You Need B12
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Monthly 1,000 mcg Maintenance Protocol Once the deficiency is fixed, a monthly maintenance protocol of 1,000 mcg injections is suggested

There is no published human trial

In addition, there has not been any reports of adverse effects associated with the intake of normal daily requirements of vitamin B12 during lactation