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They are injected intramuscularly in to the Deloris muscle at the top of the arm

Examples of SSRIs and SNRIs are: Cymbalta (duloxetine) Prozac (fluoxetine) Zoloft (sertraline) Paxil (paroxetine) Effexor (venlafaxine) Low doses of tricyclic antidepressants sometimes improve sleep and relieve mild, widespread pain in people with ME/CFS

All of these effects show why vitamin B12 injections are so valuable

Route of Administration: While oral administration is common, its bioavailability can be variable

See Sikiric et al., Curr Pharm Des, 2018 (PMID:30246642) for an overview of the reported mechanisms, and Chang et al., J Appl Physiol, 2011 (PMID:21030673) for a representative tendon-fibroblast study