Hi! Sorry if this has been offered as a solution but I am way behind on my emails since we are down to 1 working computer 🙂
Prior to having my gastric bypass surgery in April of 2005, and continuing since then, I have been taking Biotin. I buy it at WalMart, relatively inexpensive. My friend who had the surgery in 2004 lost a TON of her hair, and I have not lost any; but I do have a very thick head of hair naturally.
Biotin has not caused me any problems. I had my surgery at Duke and they recommend Biotin plus, of course, getting the adequate protein intake (60 g daily, at least). Try some and see if this helps!