Well the reason is simple. About a year ago everyone were saying "no more than 6-8 weeks". Nowadays it seems more like the period and dose of being on has increased to 8-10weeks, and even longer and the dose from 50mg up to 150mg. Maybe it has to do with the "nice price" 50mg tab's . Maybe it has to do with better info about liver protection as ALA. Maybe it has to do with the fact that when someone has been on 50mg for 6 weeks and start all over once more they increse the dose to get the same effect, then they say to people "go with 100mg, because 50mg won't do much.."...