I believe that the berries may have some small amount of caffeine but in quantity they can make you sick. This link is a really good link to explain harvesting

I believe that the berries may have some small amount of caffeine but in quantity they can make you sick. This link is a really good link to explain harvesting and enjoying yaupon tea. https://www.foragingtexas.com/2008/08/yaupon-holly.html https://www.foragingtexas.com/2008/08/yaupon-holly.html