A traditional "medicine" (North Africa, maybe also Middle East) for thinnig hair has been rubbing nigella oil on the scalp. It is very good for the hair also. You might try that.
Sent from my HTC Desire S using CurlTalk App
3 a / low porosity / medium texture and density
3 c / low porosity / fine texture / medium density
4 a / low porosity / fine texture / high density