My opinion is to have the nolva on hand, but don't use it until the cycle ends. If you feel any itch or discomfort around your nipples during the cycle, start the nolva immediately, but at 40mg. The milk thistle is for liver protection. Use it through the cycle and during post cycle therapy (pct). But this is standard cycle info, not specific to MAG10. What is MAG10? Is it 4AD & 1-Test? If so, 1-Test takes longer than two weeks to kick in. I know it's fairly common to run m1t for only two weeks, but I'm pretty sure Mag10 is not an m1t product.
What are your stats? Age, height, weight, lifting experience? All of these can be factors when designing a cycle and PCT.
dd