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Br J Haematol 1995;89:812-9

Injections can bypass the digestive tract and ensure adequate B12 intake
I feel like although the earlier commenters made it out like it's so 'uncommon', it's not at all

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Chem Eng J 140(13):3242 Puthusseri D, Aravindan V, Madhavi S, Ogale S (2014) 3D micro-porous conducting carbon beehive by single step polymer carbonization for high performance supercapacitors: the magic of in situ porogen formation
