somewhere i read that exo slin squashes ur hgh from the peps if dosed too close together so my way of combating that was I did my peps first thing upon waking then a couple hours later would do slin for preWO then would hit peps before bed... I suppose if you wanted to get another dose of peps in mix wait until your slin clears... at least 90% of it so after 5-6hrs if you did hum-r etc..