i used it internally from about 37 wks (i think) - at 38wks 3 days i was effaced and 3cm dilated and I had DS at 39 wks with a 4 hr labour...
I also used Rasp Leaf Tea and acupuncture... of course cant say what def worked but none of them did any harm and i will do the same this time. of course wasnt VBAC but thought i would add my 2 cents worth.