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And this is perfectly normal

This is especially important if you are currently pregnant, breastfeeding, have a disease condition or are taking medications including, but not limited to, antibiotics + chemotherapeutic drugs, to be sure there arent any contraindications or interactions

If youre genuinely deficient or have an absorption issue which is common with vegetarians, older adults, GI conditions, and people on metformin or PPIs yes, B12 injections often produce meaningful improvements in energy, mental clarity, and mood within days to weeks

However, the amount used for chronic migraine is a much lower potency and dose, and when used correctly, can be an amazingly helpful medication