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People with pernicious anemia, may benefit from sublingual B12 as they lack intrinsic factor and have a lot of trouble absorbing B12 through their digestive system (Ankar, 2020)

Several drugs, including para-aminosalicylic acid, have been reported to reduce the absorption of methylcobalamin, vitamin B12

It is not known what proportion of people with acne are sensitive to vitamin B 12 , and this study does not answer that, nor whether those people should limit B 12 intake

BGI (Yantian District, Shenzhen, China), an established contract research organization, isolated DNA from the remaining cecal samples and generated a metagenomic 16s rDNA amplicon library