When RCW talked about this stuff, she said that it was okay to use all over for a period of 6-8 weeks. It's not meant for longer than that.
You can, however, use it once a week or so as a preventive measure after that and then use Retin-A or whatever on the other days.
I think that's what she says she does (RCW).
I love Jessicurl HCC, Jessicurl Too Shea, KCKT, KCCC, CK and HESMU...but it took a LOT of trial error to get to these products that consistently work for ME.