... 18mg. The withdrawals aren't too bad; does anyone have advice for joint pain? My knees and elbows were very painful last night. I'm drinking at least 1 oz of wheatgrass a day, and I can't say enough about that. Nighttime is the worst; I'm not falling asleep soundly until about four or five. Sleeping pills not an option. As long as I get four hours I'm fine. Also, I woke up to my cat kneading all of my sore spots and they weren't sore any more!!! Feline power!