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A corresponding moderate increase in the functional metabolic biomarkers plasma methymalonic acid and homocysteine suggests that some depletion of maternal intracellular vitamin B12 has occurred even though serum B12 concentrations are high (Varsi et al., 2018)

Consistent administration helps build up your body's B12 levels, supporting the formation of red blood cells and maintaining nerve health over time

I self inject into my thigh, I feel it but its ok, have been doing it for over a decade

doi: 10.1186/s10194-016-0688-8

VITAMINE B12 STEROP 1mg/1ml est indique dans le traitement de la carence en vitamine B12 et de lanmie qui en dcoule

It may also not be the best option if you have high blood pressure or another contraindication