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When given by intramuscular injection, the dose bypasses the digestive tract and is absorbed reliably, which matters because dietary B12 absorption depends on stomach acid and a protein called intrinsic factor, both of which decline with age, medication and certain gut conditions

03 Downtime There is no downtime following B12 / MIC injections

Tricyclic antidepressants including imipramine and amitriptyline are a mainstay of treatment for a variety of chronic pain states, although not FDA-approved for this indication (Tauben & Stacey, 2021)

Interestingly, S586A displayed an over 2-fold improvement in activity compared with the WT enzyme (96.0 2.0 Umg 1 versus 43.1 1.0 Umg 1 ), representing the highest activity among all variants tested