Vitamin B12 injections help your body produce more healthy red blood cells, improving oxygen delivery to your tissues and reducing feelings of fatigue
Different pharmacies use different vial sizes, labels, and even liquid colors (some add B12 or other additives that change appearance)
Side effects from B12 supplementation are uncommon but may include: Mild gastrointestinal symptoms such as nausea or diarrhoea, typically with very high oral doses Headache or dizziness in some individuals Skin reactions (rash, itching) at injection sites when using intramuscular preparations Rare but serious allergic reactions, including anaphylaxis with injectable forms Hypokalaemia (low potassium) may occur during rapid correction of severe megaloblastic anaemia If you experience symptoms of a severe allergic reaction (difficulty breathing, severe rash, swelling of face or throat) after taking B12, seek immediate medical attention
For this reason, some clinics updated their charts, and give patients B12 shots at higher levels than before
Administering the Injection Choose the Injection Site : IM Injection Sites : Common sites include the deltoid muscle (upper arm), gluteus maximus (buttocks), and vastus lateralis (thigh)