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Lidocaine is a numbing agent thats very similar to what a dentist gives you prior to filling a cavity
A small amount of the ingested vitamin B12 (one to two per cent) is absorbed by passive diffusion simply crossing the cell membranes without binding to anything (Temova Rakua et al., 2022)
A 2.5mg dose requires 1ml
Medvidovic-Grubisic et al., 2017
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