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can vitamin b12 injection cause diarrhea Methylcobalamin (Vitamin B12) What Are B12 Injections? And
Description
Section on Breastfeeding

While some fermented foods or seaweed may contain traces of B12, they are often not reliable sources for a nursing parent
Vitamin B 12 deficiency is extremely common and can be responsible for several mental health and medical concerns

I'm also using an acne cream (which barely helps) but it at least gets rid of the redness