Quick question t3/clen

I will soon purchase the t3 clen combo, I have read extensively on both of these products over the last month here. I still have a question though. Seeing that t3 is catabolic, will taking it for about a week only from the get go of my cutting limit it from eating muscle at all, will it even do anything in only a week? I dont want to use anabolic agents. Just looking to shed about 10-15 lbs. Hoping the clen will help on most of the way, but thought that taking the t3 for a little burst in the beginning would minimize the catabolic effects. Sorry if the answer if right on front of me.

thanks to all