text macro for b12 injection Vitamin B12 3000 mcg B!2 Inject Kit: Package Insert
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Additionally, SS-31 has been shown to reverse the mitochondria fragmentation (Machiraju et al., 2019)

This study has several limitations

[9] It can also occur following the surgical removal of all or part of the stomach or small intestine

Plant foods have no vitamin B12 unless they are fortified

mentions that you should not treat with folic acid until the B12 levels are normal or it will affect cognitive function