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In page UTZ Certified:

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In 2014, UTZ published its first impact report.[1] This brought together 24 external studies and data collected by UTZ. It stated that UTZ cocoa, coffee and tea farms generate higher yields and better quality crops than conventional farms, and being trained in the UTZ Code of Conduct helps farmers to improve their knowledge and adopt sustainable farming practices. There are no independent scientific studies that prove positive effects of UTZ.