Can I use this shampoo if I have colored or chemically treated hair?

This shampoo is designed as a deeper-cleansing product that removes buildup from styling products and impurities. Its cleansing base and the purifying action of birch tar are effective at clearing the scalp. For colored hair, such a clarifying formula has the potential to slightly accelerate color fade, especially for vibrant or semi-permanent dyes, as it cleanses more thoroughly than a color-safe shampoo.

If your primary concern is scalp balance and you have treated hair, a cautious approach is recommended. You could use it sparingly, focusing the lather primarily on the scalp rather than the lengths of your hair, and follow with a conditioner or mask on the mid-lengths and ends. It is also prudent to perform a strand test: apply a small amount to a discreet section of hair, rinse, and observe for any unwanted change in color or texture before full use.