from day 1.
medivin which contains gluco/fish oil and so much other stuff its sick... an amazing multi and IMO the best on the market.. its sold at mr supps
starting week 5 assuming its a long ester compound
T stack RX, n2guard, hcgenerate (this is an option if you cannot afford T stack)
if you run tren run n2guard at 10 caps a day.. i know thats a lot but you can experiment by stopping n2guard midway through a tren cycle and see how differnet you feel after a couple days.. its amazing.