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Description
We always recommend getting labs done to determine if you are truly deficient in B12 and if supplementation is necessary

Therefore, vitamin B12 is thought as safe and non-toxic, although its still always best to stay with the suggested quantity and not take big dosages of any supplement without speaking with a doctor first
There are side effects associated with this treatment

Some patients experience mild nausea or headaches after their first injection, but these symptoms are usually temporary as your body adjusts

doi: 10.21037/cdt.2019.02.03
Kwatra S, Taneja G, Nasa N (2012) Alternative routes of drug administration- transdermal, pulmonary & parenteral
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