Hi @mmpopovich, Welcome to Mayo Clinic Connect. I’m happy to see you’ve reached out to members of our great forum for information about your newly diagnosed Small Lymphocytic Lymphoma and the use of green tea extract. As another member, @minnesotajim suggested, it’s best at this point to discuss everything with your hematologist before you start taking any supplements.

SLL is generally a slowly progressing disease referred to as a “smoldering” form of leukemia. It’s frequently a ‘watch and wait’ situation with no active treatment initially.

I’ve posted a couple of links below to provide you with a little more information on your condition.
https://www.leukaemia.org.au/blood-cancer-information/types-of-blood-cancer/lymphoma/non-hodgkin-lymphoma/small-lymphocytic-lymphoma/
https://www.webmd.com/cancer/lymphoma/small-lymphocytic-lymphoma-cancer
What has your hematologist discussed with you regarding your diagnosis and treatment?