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You should contact your GP if: You have been found to have elevated B12 levels on blood tests, particularly if levels exceed 1000 ng/L (approximately 740 pmol/L, though laboratory reference ranges vary) and you are not taking high-dose supplements You develop new symptoms after starting B12 supplementation, including persistent skin rashes, significant gastrointestinal disturbance, or unexplained symptoms You have underlying liver disease, kidney problems, or blood disorders and are considering B12 supplementation You are taking B12 supplements without medical supervision and have not had your levels checked, particularly if taking doses exceeding 2000 micrograms daily You experience symptoms that might indicate underlying disease, such as unexplained weight loss, persistent fatigue, jaundice, or abdominal swelling Call 999 or go to A&E if you develop severe allergic reactions following B12 injections, including difficulty breathing, facial swelling, or widespread rash, as these may indicate anaphylaxis, though this is extremely rare
Around 5-10% experience transient nausea, and 3-7% report occasional lightheadedness in the first week
Evaluate any such reviews critically and independently
Vitamin B12 injections offer several benefits including: Your body cant store vitamin B12, so a vitamin B12 injection can be repeated once a week, and its important to have repeat injections to ensure your body is functioning at its optimum level and receiving the vitamin B12 it needs to remain focused and healthy
Dosing consistency matters more than high-volume use
