Atlas Lean Mass MRP 5kg - Chocolate & MaltAtlas Lean Mass MRP is one of the most advanced and economical meal replacement powders. Atlas Lean Mass MRP contains two pure protein sources: Whey protein isolate, giving quickly digested protein of high biological value and are high in essential and branched chain amino acids. Micellar Casein, giving slowly digested, sustained release amino acids. Atlas Lean Mass MRP also provides germinated wholegrain barley provides low glycemic carbohydrates and