Optimum Nutrition CGT 10 - Creatine Glutamine Taurine is a great muscle-building combination of amino acids that you can use a s a stimulant-free preworkout drink or as a way to boost the effectiveness of your current preworkout or recovery formula. CGT 10 - Creatine Glutamine Taurine is available in both flavored and unflavored versions. Which you should choose depends in part on how your going to use it. Used as a standalone product, the flavored versions are best. If adding CGT 10 - Creatine Glutamine Taurine to a preworkout or recovery formula, use the Unflavored version to avoid making an overly sweet drink.