Severe allergic reactions
Vitamin B12 is administered as an intramuscular injection to help reduce stress, fatigue, improve memory and cardiovascular health and help maintain healthy body weight
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Since decreased Parasutterella relative abundance may accompany increased stress 80,81 , the increased Parasutterella relative abundance that occurred in this study following diet switch likely arose from the weight loss-mediated negative energy state
Some may experience minor side effects such as: Redness or swelling at the injection site Temporary soreness or bruising Less commonly, side effects could include: Mild headaches Nausea Itchy skin or rash Should you notice any prolonged side effects, we recommend speaking with your GP or calling NHS 111 for advice