well, I think someone like Zoe would give you more experienced info. but I have heard this question asked before and it's answer.
to the best of my knowlege, you shouldn't do a parasite cleanse while on the MC, or a bowel cleasnse.
Again, I'm not an expert here, but maybe a good thing to do, if you're itching to start your Master-Cleanse is do a one or two day Bowel cleanse, Liver Flush and then start your MC.
I think the parasite cleanse is important but it takes a long time. I've been on them for 2 weeks and it's not long enough, you have to do at least 30 days.