It would really be benificial to a lot of people if the term "shut down" wasn't used so liberally. You only "shut down" from massive doses over extended periods.
HOWEVER...ANY amount of exogenous testosterone will SUPRESS the HPTA.
This is so simple, yet so misunderstood.
10 weeks of 40 mgs of var is a strain on the liver, but I'm sure you'll find some people here who will disagree and even say it's good for the liver, good for your sperm count, it'll improve your love life, make you taller and increase your chances of hitting the lottery.