Arctic root 4 ER+?

Mandalala

Hi! I posted this in a thread about food for people with ER+ cancer, but I removed it as this isn't really about food. So I'm trying here:

Does anyone of you use arctic root? It's a Nordic herb, used since hundreds of year as a stimulant of metabolization as well as the nervous system (it's mild!), and it's said to be good for this and that – but the claims seem to be only moderately scientific. However, I use it for focusing quite often, and my oncologist thinks it's OK.

What I am wondering about is this: Arctic root is said to activate estrogen, and at the same time it's said to protect against breast cancer. Does anybody know more about this?