I have been taking Levoxyl 50 mcg for 7 weeks now. I experience tingling down my left arm and hand one day, but it hasn't returned. I did notice I wasn't as tired around the 4th week. But then started having a hard time falling asleep and it became a pattern. I was up to 2 to 4am everynight. I have kids to get up for school at 6:45am. So this was not good! My Dr. prescribed Temazepam to help me go to sleep at night. It works, but leaves me feeling tired most of the next day. I would really like to find a natural solution.