Side effects of B12 injections Some people may experience side effects following injections with the cyanocobalamin form of B12, such as nausea, headaches, vomiting, itching, and dizziness
Needle sizing follows a flipped scale: a higher gauge number actually means a narrower shaft, so a 25-gauge needle is finer than a 21-gauge one
When a significant B12 deficiency is corrected, your bone marrow suddenly starts making large numbers of new red blood cells, and that process pulls potassium out of the blood
B12 Injection Frequency Protocol: Daily to Monthly Regimens The frequency of vitamin B12 injections depends on how severe the deficiency is and how well the patient responds
Many people experience persistent tiredness due to nutritional deficiencies, stress, or lifestyle factors