The big ztm from the protein workstm is a great tasting high protein hot chocolate malted drink it is the ideal bedtime drink packed full of nutrients sourced from premium grade micellar casein and whey protein concentrate in addition it contains our own night time amino acid blend specifically designed for the big ztm r as with all tpwtm products the big ztm is uncompromising in the quality and list of ingredients used in its formulation nutritionally designed to fit all diet