Ever since I got my RSI & TOS injuries - I have just kept my hair short so a quick wash and fluff is all I need to do.

Do you take any supplements?
MSM is supposed to be good for many body cells- my hair, skin and nails improve when I take it. It 's also helpful for allergies, heartburn - just the whole body.
non toxic
double check for any meds interaction - but mostly safe.
Drug info and interaction checkers
http://www.drugintel.com/
http://www.drugs.com/drug_interactions.html
http://www.drugdigest.org

also I've read of using Mayonnaise or olive oil as a deep conditioner
- leave it on for hours and then wash out.