I lost a ton with boy boys, more with DS2 though. It lasted until around a year. Its still taking forever to grow back to its normal thickness though. With DS1, I lost hair for a few months, and that was it. And then it was right back to its normal thickness. With DS2, I lost it for what seemed like forever, and its pretty thin now. I've been using Nioxin hair treatment for thinning hair, and its helping, but very slowly.