Platinum 100% Glutamine supplies 4.5g of glutamine per serving, which works to rapidly replenish the glutamine used during training. Glutamine is the most abundant conditionally essential free amino acid in your body – more than 20% of the total circulating amino acids in your body are glutamine. Your muscles are especially high in glutamine, making it extremely important for muscle metabolism. When you’re training hard, your muscles can lose up to 50% of their glutamine stores, so you need to replace them – fast!