Since I've been taking MSM I have been able to go from 8-10 weeks post relaxer to longer than 14 weeks. My new growth comes in so soft, shiny and manageable that I just don't have to re-touch as often. Initially, I did experience the skin tingling/crawling thing. Just drink plenty of water with it and take some form of vitamin C with it. I would suggest that you read the other posts on MSM, ask a pharmacist, and do some research on MSM just to be sure that it's right for you. Enjoy your results!