He recommends KY or other water-based lubricant, and they use a medical grade version of KY (basically) at the recovery residence. I used KY for the first 3 months, and then on the advice of my GP switched to Vagisil "feminine moisturizer" after that. I did check Brassard's instructions, and he said any water-based lubricant was fine, which this is. The nice thing is the Vagisil lasts tons longer than the others I've tried; I'm dilating a little more than once a week now and a 2-oz tube lasts me months and months, plus it doesn't make as much of a mess.