Pure Arginine & Ornithine 90 capsulesParticularly suitable for intensive training Arginine is a conditionally essential (dispensable) amino acid. This means that in certain situations the demand can be greater than the supply, e. g. B. in growth or during challenging training. Arginine and ornithine are closely related in metabolism and complement each other in their function. The application of arginine & ornithine is recommended before going to sleep or, for athletes, one hour before