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Berberine may affect gut bacteria and digestion to increase peptides associated with appetite (including GLP-1), and regulate genes and blood sugar production from the liver
These include vitamin B12 deficiency and malabsorption that is caused by the following medical conditions, according to the NIH [1]: Also, according to the NIH, vitamin B-12 injections have some potential side effects, including [1]: While many dietary supplement brands claim to boost metabolism, suppress appetite, or promote weight loss, research is lacking on these claims
Tantikitti, V
Rubino DM, Greenway FL, Khalid U, ONeil PM, Rosenstock J, Srrig R, et al
Determination of carnitine and saturated-acyl group carnitines in human urine by high-performance liquid chromatography with fluorescence detection