My hair grew back fine. I didn't let this recent cowashing experiment continue on long enough for my hair to be noticeably thinner. I think in my case the extra manipulation required to get my hair clean is the culprit. When I use shampoo, I gently massage it for only a few seconds into the scalp area. I don't massage the length. The suds travel down my length as I'm rinsing it out and that gets my length very clean without any dryness. It works for me.
Originally Posted by JLeighs
Out of curiosity, what poo do you use?

And same here, I'm leaning toward it being mechanical hair loss.