Alternating between Kerastase Bain Vital Haute Tolerance (For sensitive scalp - looks like you have dandruff but your skin is reddish) and their new range Biotin (can't remember the name). It works so far since I had many difficulties in getting a decent shampoo that doesn't irritate my scalp. I used to think I have a dandruff problem but after a scalp analysis, I have very sensitive scalp which switches between being itchy (and the flakes looks like dandruff) and oily.
I believe if hair is not healthy means scalp is not properly taken care of (diet is important too!). If you have sensitive scalp and coloured hair, you can alternate between shampoos.

You have to get it check out. I found out coz Kerastase had an event and they used a machine to see my scalp (up close). I dye my hair often and I have tried L'Oreal and Kerastase hair colour shampoo and conditioner. But it only makes the itch worst. So I either stick to the sensitive scalp shampoo or alternate between sensitive and hair colour shampoo. Right now, I am trying out the Kerastase Scalp treatment. Btw, Kerastase creates a big foam with a 20cent amount.

Does anyone know where to get or use Davines or Lakme products?