My father was giving this when he was in chimo treatments for colon cancer along whey protein.
I asked is oncologist why he gave him greens plus and he told me because its antioxidant and has a lot of protection for liver and kidneys and more.
There is a long list http://greensplus.com/index.php/cPath/34_36
Check out this link, i started using this supplement when my father passed away in Febuary from cancer and add 2 bottles left.
ITs a very good supplement i also mix some curcumin in it since apparently its very good for colon protection and cancer.
Sencha green tea is also very good.
Tought i might bring this up cause it seems to be a very good protection for people on phera plex cycles.
I use it twice a day once in the morning mixed with crystal light juice, curcumin and flax oil and again same mix at night.