You might lose all your hair! That was a joke. No, Loreal is one of the best brands of cosmetics out there and you have nothing to be scared about. Both my sister and I are big fans of Loreal and most of gang also uses Loreal products. But anti dandruff shampoos can be a problem as they may contain more chemicals. So avoid using too much of it. Stick to a maximum routine of around three times a week and you should be fine. If you feel any side effects then stop using the shampoo and revert to something herbal.