Cycle Length: 48 weeks, followed by a break
The FDA-designated label for cyanocobalamin states that it can be given either intramuscularly or subcutaneously
What to Expect During Your B12 Injection B12 injections offer a more effective alternative to oral supplements, as they bypass the digestive system, ensuring higher absorption and faster results
This is why many researchers prefer reconstitution ratios that produce round concentrations
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