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Poor aseptic technique on each puncture

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If you have vitamin B12 deficiency from pernicious anemia or as a result of bariatric surgery, then you must supplement with vitamin B12 regularly in order to prevent debilitating symptoms such as fatigue, depression, muscle pain, memory loss, and other signs of cognitive and neurological breakdown

Chronic diseases such as Crohn's, celiac disease and gastritis can impair vitamin B12 absorption

Some vendors are competitive on single compounds but charge a premium on multi-peptide blends, so the best value depends on what you order