As described by Cant et al
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
By itself, however, a B12 injection isnt likely to produce a significant amount of weight loss
Vitamin B12 is an essential, water-soluble nutrient for vitality and wellbeing
That being said, taking the supplements when you dont need them may cause side effects like: nausea vomiting feeling tired headaches diarrhea tingling or numbness Serious side effects of the shot are rare, but may include: If you notice any side effects of the pill or shot, call your doc right away
Nutritional support during pregnancy remains important