This could be daily, weekly, monthly, or at other intervals appropriate for your physiology
In clinic settings, emergency measures (like epinephrine and antihistamines) should be readily available in the rare event of an allergic reaction
"The importance of folate, vitamins B6 and B12 for the lowering of homocysteine concentrations for patients with recurrent pregnancy loss and MTHFR mutations"
Coverage is more likely if you have an underlying health condition that prevents your body from properly absorbing Vitamin B12 from food or supplements, such as pernicious anemia or certain gastrointestinal disorders, or if you have had specific surgeries like gastric bypass
While many people meet their Vitamin B12 needs through diet, some individuals require supplements or injections for effective treatment and prevention of deficiency complications
But it can also prevent the loss of neurons that are important for brain function