Bilberries (Vaccinium myrtillus) are used to treat non-specific diarrhea and for symptoms related to varicose veins. Because they are quite expensive fruits, quality problems and compositional fraud might occur for dietary supplements. This study investigated fresh/dried bilberries and dietary supplements by high-performance liquid chromatography (HPLC) fingerprinting against a quantified bilberry reference extract for identity testing and to test total anthocyanin content by HPLC and for quantification of hydrolyzable and condensed tannins. Protocols were detecting improper drying/storage and adulteration with other Vaccinium species or elderberries. The majority (91
Investigation of dietary supplements revealed major problems, with 45
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