Oropharma Can-Tax is a red colourant based on canthaxanthin. This dietary supplement colours red canaries intensifies the red colour in other birds and ensures a beautiful even red colour. When adding Can-Tax to the food canthaxanthin is transported to the place where the feather is growing and it is given the more intense red colour. Beta-apo-8’-carotenal ensures even better absorption of canthaxanthin. The feather formed retains its colour until the formation of a new feather.