Grunt is an essential amino acid (EAA) product from Redcon1.
The supplement contains all nine essential amino acids (EAA): Isoleucine, leucine, histidine, methionine, lysine, phenylalanine, tryptophan, threonine, and valine. As a result, Grunt is a complete source of protein.
EAA cannot be produced by the body and so they need to be consumed in the diet or through supplementation.
According to Redcon1 website, Grunt should be used as part of your pre-workout routine. This distinguishes EAA from BCAA (branched-chain amino acids), which the brand says are best taken after exercise.