why does b12 injections make me tired did feel worse?” I hear this all the time—women tell me they started B12 shots or IVs and suddenly felt overstimulated, jittery, or couldn't sleep. Here's what's really Why Do I Feel Worse
Description
In fact, any chronic GI disorder can result in low cobalamin levels

A nurse or other healthcare provider will teach you or your partner how to deliver the injections
Patient Counseling Information: Advise patients to report any unusual symptoms or allergic reactions after the injection

These products are not intended to diagnose, treat, cure, or prevent disease.

doi:10.1016/S0140-6736(88)91898-3
They measured the full B12 body count of four people and found it to be 780 to 1,350 g of B12 with a daily loss of 0.12% for a maximum loss of 1.6 g per day or 11.2 g per week
