Rainbow Supplement Protein uses high-quality fast and slow absorbing protein types for an all-in-one protein you can use at any time. Rainbow Supplement Protein’s primary source is pure Whey Protein, the fastest to absorb and the best body and muscle fuel before a workout to supply muscles with essential amino acids and post-workout to recover quicker and stronger. Plus, we use high-quality ingredients from high-quality manufacturing units to ensure what you put inside creates great results outside.