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Vitamin B12 Injection Sites: Understanding the Essentials Vitamin B12 injection site concerns are common among those considering or already using B12 injections
Because vitamin B12 has a wide array of cellular actions the symptoms of deficiency are quite diverse
PMID 20143256 Pfizer/Hospira
Also, most supplements are well below the upper limit
Deficiency has been recognized in infants of vegetarian mothers who were breast fed, even though the mothers had no symptoms of deficiency at the time
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