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There are gastrointestinal conditions affecting absorption

With proper training and guidance from healthcare professionals, it is possible to self-administer B12 injections

A Piece of the Coronavirus The SARS-CoV-2 virus is studded with proteins that it uses to enter human cells

And it goes without saying, but sharing injection supplies or medication is both illegal and potentially dangerous

Injectable medicines should be administered by appropriately trained healthcare professionals in clinical settings with emergency resuscitation facilities available

10.1016/j.jconrel.2017.12.015 132 ZhouY.ZhuF.LiuY.ZhengM.WangY.ZhangD.et al (2020)