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why are b12 injections not working Vitamin Shots Right for You? How Long Does It Take
Description
Side effects are not common with methylcobalamin injections, but its possible to have some pain and redness in the injection area

BMC Nutr 2024;10:3

Many experts recommend using these on alternate nights or in separate routines (for example, acids or strong vitamin C in the morning and copper peptides at night) to maintain efficacy and a strong skin barrier

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