Shroom supplements

Hi, I’m in the UK and looking for quality supplements. I’m currently in remission (18mnths) from breast cancer and would like to keep it that way. I’ve scoured the internet and came across a site called vegishake, ordered and tried out Turkey Tail, no way of knowing their process of extraction, also ordered a 6 in 1 mushroom supplement over 3 weeks ago, still waiting, so not the best. Proving more difficult than initially thought unfortunately. Any advise please toward a decent supplier?