I have a problem with brittle nails and hair, and have also had some dental problems lately, that were really unexpected for me. I am now considering using biotin supplements to help with hair and all of this, as I have been told that biotin has great results. But are there any side effects with biotin?
I think you should try and find out the root cause of the symptoms which you are describing, rather than toying around with self medication like that. Get some blood tests done, and if it turns out that you have a biotin deficiency, start taking biotin supplements then. You never know, you might actually have a totally different problem.