what is the normal dose of b12 injection Vitamin Injections Dosage and Frequency How Long Do Vitamin B12

doi:10.1093/ajcn/48.3.852

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You said she is autistic, just an idea You could inject in each leg for each injection but in the same muscle area so then it may feel more comfortable and the area should not hurt

Alternatively, making small batches and storing refrigerated can extend shelf life without preservatives

If you are elderly and have concerns about some of the symptoms of vitamin B12 deficiency, then you should see your doctor

Because methylcobalamin is easier to absorb than other forms of B12, which require a conversion step prior to absorption