Yeah bro, you do need a PCT for havoc, just like any other hormone. Since your cycle was only a month long, so you can recover quickly from this.
You want to cycle fast acting steroids like havoc in short cycles and take advantage of the quick gains, quick clearance, and quick recovery – there is no reason to do an 8 week cycle with fast acting oral hormones.
I would just take the milk thistle after the Havoc during PCT.
Sustain Alpha would have you covered for PCT. You can read quite a few logs of guys using this for their PCT with a google search for Sustain Alpha.
-Pp