I just have that one favorite @redken the GI series are it for me 🙃 anyone else ?! of course even when I do use them, I custom formulate everyone’s hair always with a mixture of things. Your hair usually has 2-6 different color formulas on it if it’s done by me. Never just 1! I love creating custom colors that cannot just be recreated by using one sole color. chances are that your formula may have some GI in it 🙋🏼‍♀️🤪