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Aminoglycosides, tetracyclines, and certain other antibiotics may alter gut microbiota composition, potentially affecting the small amount of vitamin B12 that is produced by colonic bacteria, though this is generally not clinically significant for patients receiving injectable B12 supplementation

It was shown that BRCA1 occupied the NNMT promoter and regulating its expression ( BRCA1 and CDK12 depletion contribute to mitochondrial respiration defects and decreased ATP levels due to the reduced mitochondrial DNA copy number rather than mitochondrial number, which suggest that they stem from decreased flux through electron transport complexes rather than a decrease in mitochondria (66)

Critics, including the FDA's own scientific staff, argue that insufficient evidence exists to ensure these compounds are safe for human use

doi: 10.1002/jps.20094 195 PardridgeW