After trying Zyalix for over a month, I saw no benefits. I tried to return their product (as described under their terms and conditions) but was told they would not issue a Return Merchandise Authorization (RMA) because I didn't qualify for a return. They offered no reason, and they just refused to allow a return. I was told that I would get a call from a supervisor within 24 hours, so we will see what comes from that.
Bottom Line: No, I would not recommend this to a friend