About sis rego protein bar sis rego protein bars contain a blend of easily digestible proteins 20 grams of protein per bar in the form of whey casein and soy protein sports scientists are increasingly recognising the importance of consuming protein in close proximity to training sessions ie before or after training in order to maximize how our muscles adapt to training the importance of protein is also often overlooked by endurance athletes and for this reason sis rego protein bars prov