So I noticed something interesting that may or may not be a coincidence.
I generally try to stick with glycerin soap to clean my hair, but oftentimes I get lazy and just use some cheap OTC shampoo instead (the glycerin soap is in bar form and it's hard to coat the scalp and hair with). For the last few months I've basically been using crappy supermarket shampoo when not using ketoconazole.
When I read Tracy's advice on avoiding harsh sulfates (I believe there are two kinds, SLS and ALS, but correct me if I'm wrong) I switched back to the glycerin soap, which doesn't contain them.
Only a few days later, I am noticing a hugely reduced shed in the shower. I've actually been going through a pretty major shed recently, with a lot of hair coming out in my hands when I shampoo, and I chalked it up to a cyclical shed from my regimen. But it's less than a week after switching and I'm literally seeing like 1/3 as many hairs come out when I wash, maybe even fewer than that.
Like I said, it could be a coincidence. But I'm starting to wonder now if some people are prone to shedding more with these sulfate shampoos.
Either way I'm relieved right now, because this was a heavy shed compared to what I'm used to. I hope it doesn't come back any time soon.