Is this shampoo keratin safe ?

I would say it is. It doesn't have any pore clogging ingredients, AND it doesn't have any sulfates/PEGs/Parabens or sodium chloride, which is said to be linked to hair loss when used for long periods of time. That's if the ingredients don't change. but that's just speaking for the ingredients listed. Other products could be used to counteract some ingredients (sodium chloride), like detox shampoos, to remove build-up over time on scalp/hair.