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Description
[DOI] [PMC free article] [PubMed] [Google Scholar] 30.Waterson M.J., Horvath T.L

Both supplements commonly cause gastrointestinal symptoms including nausea, diarrhoea, and abdominal discomfort
Less commonly, berberine may cause headache or a bitter taste

Country of Origin: Made and quality tested in the USA with globally sourced ingredients
