Content of Caffeine and Catechins Measured in Multi-ingredient Dietary Supplements Containing Green Tea: Association with Label Claims and Proprietary Blends

摘要

Multi-ingredient dietary supplements (DSs) containing green tea (GT) were analyzed for their phytochemical content (seven catechins and caffeine) as part of a Dietary Supplement Ingredient Database project. The label information required by FDA is the weight of the GT extract or leaf powder, unless it is part of a proprietary blend (only the blend weight needed). Any information about the concentration of GT phytochemicals is voluntary. We assessed the accuracy of the mandatory and voluntary portions of labels and the effect of proprietary blends on the phytochemical content.