Yeah, I've heard of this and am wondering the same thing. Also supposedly taking Benadryl or ketotifen while on cycle with clen slows down receptor desensitivity which allows for a longer (i.e. 6 week) cycle. Thoughts?
Also, I've seen a lot of guys in here saying 2wks on/2wks off, however I started a 3-week cycle (start at 40mcg, +20mcg every 3rd day up to 100mcg for 3 days, then back down). Is this less effective?