A main question many people have when switching shampoos, is "is this product safe to use on colour treated hair?" BlackBox Cosmetics' VuDu hair products are indeed safe to use on colour treated hair. One of the ingredients that helps make this statement a reality is Goldenseal Extract. Until I started using these products, I had never heard of this before, and had no idea what Goldenseal actually was... so being of the curious type, I thought I would look into it, and here is what I found.