b12 injection and fainting Causes of deficiency how its related to MTHFR? What happens if you inject

Pregnant and breast feeding women who are low in B12 should only receive smaller doses.

Low active folate levels can lead to a build of of homocysteine and lack of methionine in the body and can lead to several health problems (more on high homocysteine levels can be found here)

B12 helps convert the food you eat into glucose, which your body uses for energy

A 2013 study by Stier et al

Reduced stress: Whether because of a combination of the above benefits, or because of affects of the Vitamin B12 injection itself is unclear, patients have reported a significant decline in stress after receiving Vitamin B12 injections