Coconut and argan oils are the best products to use (the pure oils) to protect hair from dye containing conventional peroxide, conventional peroxide, and bleach. They are best used on hair with limited to no residue, or a limited amount of a lightweight conditioner used. They can work even better when no conditioner has been used after washing hair, a day or so before processing. Details are in this blog. Argan oil has been noted to make skin sun or photosensitive, if it is used on skin during the day.
See