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Homocysteine rises when there is not enough B12 in the cell fluid to support methylation, an important process where a methyl group is added to all sorts of molecules in the cell

These include immune function, neurotransmitters, neurological health, memory, and more

It's also widely available in fortified foods such as breakfast cereals and milks, both soy and cow

Expert Q&A Tips Apply a topical anesthetic on the injection site so its less painful when you receive it.Thanks Warnings Contact a doctor or go to the emergency room if you experience nausea, vomiting, facial swelling, loss of vision, or a fever after an injection that shouldnt result in these symptoms.Thanks Always contact your doctor if you have questions about your medications or your post-injection symptoms get worse instead of better.Thanks References About This Article Reader Success Stories "Very helpful and knowledgeable article."