Declining brain health (cognition et al) is a possible SE of LT ADT.
I am on a 2 year ADT plan. Here are some supplements I take for various reasons that also are said to have brain-on-LT-ADT health benefits. (Per Dr. Google)
Creatine
Taurine
L Theanine
HMB (long chemical name)
Exercise (you can go as big as you want with exercise)
I expect to add Berberine soon
Cheers