Its also important for DNA, fatty acids, and amino acid metabolism
Vitamin B12 is one of those vitamins
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The most common side effect is some soreness at the injection site, and you might notice your urine turning bright yellow (thats just the excess vitamins, particularly riboflavin, being excreted)
However, these do have to be prescribed and administered by a healthcare professional, and are more likely to be given to people who have lifelong conditions affecting their ability to absorb B12 or who are at higher risk of consistent deficiency