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you need to know how much of the active compound is truly getting to where it needs to go
An intramuscular B12 shot goes directly into your muscle fibers for 100% systemic absorption and immediate efficacy
But serious side effects like allergic reactions are rare
Vitamin B12 injections can treat a number of different health conditions, so how often you can take these injections will depend on the reasons why you need the B12 in the first place
203210, pubmed.ncbi.nlm.nih.gov/23892832/
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