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Know what side effects you consider acceptable and what would prompt you to stop
Eligible studies included randomised controlled trials, cohort, and case-control studies assessing B12 supplementation efficacy via oral, sublingual, or IM administration routes
Not shown on the list because they are strictly oral are the collagen peptides which are widely marketed and not-FDA approved
Others who may be more susceptible to vitamin B12 deficiency are patients diagnosed with Crohns disease or celiac disease, and those who have undergone intestinal procedures such as weight loss surgery
Doctors Recommendation : Make sure to consult a healthcare provider to determine the best supplementation method for your needs
