Optimum nutrition gold standard 100 casein 909g is the worlds no 1 all micellar casein and even better it tastes delicious is sugar free and is only 10 calories per servingr the great taste of optimum nutritions casein provides protein over a sustained period of time and is great value for moneyr casein proteins are ph sensitive and it can take more than twice as long for caseins to be broken down into their amino acid subcomponents than whey and other proteinsr the caseins feature a