This product pairs immune-boosting chaga with green tea, which has also been shown to strengthen the immune system. It tastes good, too, thanks to the blackberry, goji, and strawberry leaves added into the mix.  

From the brand: 

The most advanced green tea and mushroom blend. Premium Bancha green tea enhanced with a precise dose of concentrated, full-spectrum plant extracts to support energy and immunity. Kickstart your body’s natural defense system for preventative or in-the-moment support. Balanced energy from green tea. 6:1 chaga mushroom extraction lends to the dark color of this tea.