Sci-MX GRS-9 Hour Protein 2.28kg Benefits GRS-9 takes 9 hours to break down fully to keep your muscles between meals Protein blend that provides fast & slow releasing delivery of amino acids Versatilily means it can cover any period of the day High protein & amino acid content to boost the rate of muscle gain Fortified with digestive enzymes & vitamins Predator Nutrition GRS-9 Hour Protein 2.28kg Review Sci-MX GRS-5 has been renamed GRS-9 Hour Protein reflecting a move away from basing the name around the number of types of protein towards the number of hours which Sci-MX are saying that GRS-9 Hour will remain in the body after consumption thereby aiding the process of repairing muscle over a very long period.GRS-9 Hour is a protein blend based around whey, milk, soy & glutamine peptides. The whey provides fast release in this formula while the casein is great for feeding the muscles over a long period. In our view, the soy & glutamine peptides make this product not in the same class as something like Trutein which uses only dairy proteins but with that said, there is research on soy & glutamine peptides which demonstrate each has its own unique advantages & for women & older men, GRS-9 Hour is a good particularly good fit.GRS-9 Hour Protein's strongest features are its inclusion of extra ingredients in the form of digestive enzymes, vitamins, & MCT oils, each of which has a variety of positive effects as far as improving health & performance.