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This article does not prescribe doses
Public Health Division of the Welsh Government reply We have received a reply from the Public Health Division of the Welsh Government re-assuring us that stocks of vitamin B12 injections are not affected by the current situation with COVID-19, and that when a patients has made an appointment, an assessment needs to be made on the day to determine whether the patient has any of the symptoms of infection
The same may be true of folic acid, which is commonly taken in supplement form during pregnancy, per a 2022 study published in Advances in Nutrition
However, with direct injection, if you do not need the additional B12, it may result in high levels in your blood that can cause side effects including gastrointestinal issues, headache and dizziness, tiredness and weakness, or skin irritation until the excess is flushed out via your kidneys and urine
A B12 deficiency can cause a variety of health problems, so it's often used to treat or prevent it
