Taking biotin supplements can help slow/stop hairloss. I personally have not experienced any problems with it, but I know of people who have.

If you have been under a lot of stress or are vitamin deficient it can cause hair loss. It works in a cycle --- it takes 6 to 8 weeks after a change/event for the loss to appear and then it can take another 6 to 8 weeks for the loss to be reversed.