Prolab® beta alanine exreme® - 56 capsules prolab® beta alanine extreme® is a dynamic blend of carnosyn® beta alanine and he amino acid l-histidine, designed to delay muscle fatigue. Beta alanine floods the muscles with the specialized amino cid carnosine to work as a buffer against lactic acid buildup helping you train at a higher intensity for a longer period of time before fatigue sets in. You do your part. We'll do ours. ® endurance recovery stamina. Prolab beta alanine exreme - 56 capsules (28 servings)