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Please show me documentation that disagrees with this if I am understanding this incorrectly
Vitamin B12 is an essential nutrient, and those that have that are deficient in this vitamin would need vitamin B12 injections every couple of months
bioRxiv , 2023.2010.2023.563621 (2023)
If you are deficient, injections are often more effective than oral supplements, particularly if you have absorption problems
However, you need to discuss the dosage and frequency of the vitamin injections with your doctor
The most common side effect is temporary mild irritation at the injection site
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