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Pro hormone Timing with Body Building Show

I am going to be taking part in a body building show in 6 weeks and recently been given the prohormone V-Tren XT. My question is when should I begin taking it? Should I wait until I am 4 weeks out, or jump right in? I am hoping that it will help me get the last few stubborn pounds off and help me maintain my size and some of strength (it has declined significantly on the diet).

Any help is greatly appreciated, as my experience with these substances is minimal. Also, this substance is legal for the show.