Dosage can vary based on goals: metabolic support, anti-aging, or athletic performance
Sealing and healing the gut will help to reduce these sensitivities over time
Higher-Caution Situations Extra medical supervision is important if you: have a history of reactions to injectable vitamins/cobalamins have significant kidney or liver disease are pregnant or breastfeeding are offered a compounded MIC B12 product without clear labeling of ingredients, concentrations, and compounding source The FDAs overview of compounding helps explain why quality can vary (see Compounding and the FDA: Questions and Answers )
Li N, Zhao M, Hilario-Vargas J, Prisayanh P, Warren S, Diaz LA, et al
Reported effects, mostly anecdotal from the research community, include injection site redness or minor swelling, transient fatigue in the first week of loading, and mild headache when doses are pushed above the typical research range