Hi Cathy,
I used Biotin while I was on Arava. It didn't stop the hair loss, but it did seem to slow it down. As I remember, it took a couple of weeks to notice the difference. I'm no longer on the Arava, but I still take the Biotin. They were even giving out samples of biotin at Costco and said it's good for hair and nails. I hope it helps you. It's worth a try.
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Thanks V for the feedback. I am glad to hear that your friends are having success with Biotin!
Cathy