fora.... I have used it without issues... a salon I used to buy-from in Dublin, used to use it, including applying it neat onto the hair...... when I say I used it, I`m not a fan of frequent shampooings generally, irrespective of what type/brand of shampoo used, because frequent shampooing can and does dry the hair further and lifts the colour..less is best when it comes to system hair, in my book.
A desert-spoon amount mixed into a basin of water is relatively harmless....... you`re probably better off using a shampoo formulated specifically for system-hair, but if you`re ` stuck`, the Johnsons one would be my choice as an alternative....this is the one I would recommend [the ` no more tears` formula, as you can get it into the eyes and it won`t hurt/harm them,so it`s very mild/gentle] http://www.johnsonsbaby.com/johnsons-baby-shampoo