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Injecting can also come with risks like pain and swelling at the injection site, infection or allergic reaction
Look for third-party testing, 97-99% purity, proper packaging
[51] Diagnosis [edit] According to one review: "At present, no 'gold standard' test exists for the diagnosis of vitamin B 12 deficiency and as a consequence the diagnosis requires consideration of both the clinical state of the patient and the results of investigations." [52] The vitamin deficiency is typically suspected when a routine complete blood count shows anemia with an elevated mean corpuscular volume (MCV)
More commonly though, deficiency is due to poor absorption of this large vitamin
In a healthy gut, this is a minor annoyance
What increasingly used looks like in practice is private clinics, compounding pharmacies, and the research-chemical market
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