I don't know the answer, but I commiserate. My hair looks lovely:well moisturized but never oily looking. I can go eternally without washing it, and it never gets oily. But, I've have horrible dandruff now (likely seborrhoeic dermatitis, a.k.a. cradle cap). It's been there for months and never cleared up. I'm afraid to use chemical treatments not only because they're nasty, but also because I'm pregnant, and I don't want my baby exposed to those chemicals. Sigh.