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Magnesium oxide, citrate, and sulfate tend to have the strongest laxative effect, while magnesium glycinate or microencapsulated time-release capsules may be better tolerated among people with gastrointestinal conditions

References Double-blinded comparison of diphenhydramine versus lidocaine as a local anesthetic The objective of this study was to evaluate the efficacy, onset of action, duration of action, and side effects of 1% diphenhydramine compared with 1% lidocaine when used as a local anesthetic agent

standard supplemental B12 injection doses range from 1001000 mcg

Understanding these potential mechanisms helps clinicians and patients identify strategies to minimise discomfort whilst maintaining adequate B12 intake